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env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/common.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from pandas import (
+    DataFrame,
+    concat,
+)
+
+if TYPE_CHECKING:
+    from pandas._typing import AxisInt
+
+
+def _check_mixed_float(df, dtype=None):
+    # float16 are most likely to be upcasted to float32
+    dtypes = {"A": "float32", "B": "float32", "C": "float16", "D": "float64"}
+    if isinstance(dtype, str):
+        dtypes = {k: dtype for k, v in dtypes.items()}
+    elif isinstance(dtype, dict):
+        dtypes.update(dtype)
+    if dtypes.get("A"):
+        assert df.dtypes["A"] == dtypes["A"]
+    if dtypes.get("B"):
+        assert df.dtypes["B"] == dtypes["B"]
+    if dtypes.get("C"):
+        assert df.dtypes["C"] == dtypes["C"]
+    if dtypes.get("D"):
+        assert df.dtypes["D"] == dtypes["D"]
+
+
+def _check_mixed_int(df, dtype=None):
+    dtypes = {"A": "int32", "B": "uint64", "C": "uint8", "D": "int64"}
+    if isinstance(dtype, str):
+        dtypes = {k: dtype for k, v in dtypes.items()}
+    elif isinstance(dtype, dict):
+        dtypes.update(dtype)
+    if dtypes.get("A"):
+        assert df.dtypes["A"] == dtypes["A"]
+    if dtypes.get("B"):
+        assert df.dtypes["B"] == dtypes["B"]
+    if dtypes.get("C"):
+        assert df.dtypes["C"] == dtypes["C"]
+    if dtypes.get("D"):
+        assert df.dtypes["D"] == dtypes["D"]
+
+
+def zip_frames(frames: list[DataFrame], axis: AxisInt = 1) -> DataFrame:
+    """
+    take a list of frames, zip them together under the
+    assumption that these all have the first frames' index/columns.
+
+    Returns
+    -------
+    new_frame : DataFrame
+    """
+    if axis == 1:
+        columns = frames[0].columns
+        zipped = [f.loc[:, c] for c in columns for f in frames]
+        return concat(zipped, axis=1)
+    else:
+        index = frames[0].index
+        zipped = [f.loc[i, :] for i in index for f in frames]
+        return DataFrame(zipped)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/conftest.py

@@ -0,0 +1,100 @@
+import numpy as np
+import pytest
+
+from pandas import (
+    DataFrame,
+    Index,
+    NaT,
+    date_range,
+)
+
+
+@pytest.fixture
+def datetime_frame() -> DataFrame:
+    """
+    Fixture for DataFrame of floats with DatetimeIndex
+
+    Columns are ['A', 'B', 'C', 'D']
+    """
+    return DataFrame(
+        np.random.default_rng(2).standard_normal((100, 4)),
+        columns=Index(list("ABCD"), dtype=object),
+        index=date_range("2000-01-01", periods=100, freq="B"),
+    )
+
+
+@pytest.fixture
+def float_string_frame():
+    """
+    Fixture for DataFrame of floats and strings with index of unique strings
+
+    Columns are ['A', 'B', 'C', 'D', 'foo'].
+    """
+    df = DataFrame(
+        np.random.default_rng(2).standard_normal((30, 4)),
+        index=Index([f"foo_{i}" for i in range(30)], dtype=object),
+        columns=Index(list("ABCD"), dtype=object),
+    )
+    df["foo"] = "bar"
+    return df
+
+
+@pytest.fixture
+def mixed_float_frame():
+    """
+    Fixture for DataFrame of different float types with index of unique strings
+
+    Columns are ['A', 'B', 'C', 'D'].
+    """
+    df = DataFrame(
+        {
+            col: np.random.default_rng(2).random(30, dtype=dtype)
+            for col, dtype in zip(
+                list("ABCD"), ["float32", "float32", "float32", "float64"]
+            )
+        },
+        index=Index([f"foo_{i}" for i in range(30)], dtype=object),
+    )
+    # not supported by numpy random
+    df["C"] = df["C"].astype("float16")
+    return df
+
+
+@pytest.fixture
+def mixed_int_frame():
+    """
+    Fixture for DataFrame of different int types with index of unique strings
+
+    Columns are ['A', 'B', 'C', 'D'].
+    """
+    return DataFrame(
+        {
+            col: np.ones(30, dtype=dtype)
+            for col, dtype in zip(list("ABCD"), ["int32", "uint64", "uint8", "int64"])
+        },
+        index=Index([f"foo_{i}" for i in range(30)], dtype=object),
+    )
+
+
+@pytest.fixture
+def timezone_frame():
+    """
+    Fixture for DataFrame of date_range Series with different time zones
+
+    Columns are ['A', 'B', 'C']; some entries are missing
+
+               A                         B                         C
+    0 2013-01-01 2013-01-01 00:00:00-05:00 2013-01-01 00:00:00+01:00
+    1 2013-01-02                       NaT                       NaT
+    2 2013-01-03 2013-01-03 00:00:00-05:00 2013-01-03 00:00:00+01:00
+    """
+    df = DataFrame(
+        {
+            "A": date_range("20130101", periods=3),
+            "B": date_range("20130101", periods=3, tz="US/Eastern"),
+            "C": date_range("20130101", periods=3, tz="CET"),
+        }
+    )
+    df.iloc[1, 1] = NaT
+    df.iloc[1, 2] = NaT
+    return df

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_assign.py

@@ -0,0 +1,84 @@
+import pytest
+
+from pandas import DataFrame
+import pandas._testing as tm
+
+
+class TestAssign:
+    def test_assign(self):
+        df = DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})
+        original = df.copy()
+        result = df.assign(C=df.B / df.A)
+        expected = df.copy()
+        expected["C"] = [4, 2.5, 2]
+        tm.assert_frame_equal(result, expected)
+
+        # lambda syntax
+        result = df.assign(C=lambda x: x.B / x.A)
+        tm.assert_frame_equal(result, expected)
+
+        # original is unmodified
+        tm.assert_frame_equal(df, original)
+
+        # Non-Series array-like
+        result = df.assign(C=[4, 2.5, 2])
+        tm.assert_frame_equal(result, expected)
+        # original is unmodified
+        tm.assert_frame_equal(df, original)
+
+        result = df.assign(B=df.B / df.A)
+        expected = expected.drop("B", axis=1).rename(columns={"C": "B"})
+        tm.assert_frame_equal(result, expected)
+
+        # overwrite
+        result = df.assign(A=df.A + df.B)
+        expected = df.copy()
+        expected["A"] = [5, 7, 9]
+        tm.assert_frame_equal(result, expected)
+
+        # lambda
+        result = df.assign(A=lambda x: x.A + x.B)
+        tm.assert_frame_equal(result, expected)
+
+    def test_assign_multiple(self):
+        df = DataFrame([[1, 4], [2, 5], [3, 6]], columns=["A", "B"])
+        result = df.assign(C=[7, 8, 9], D=df.A, E=lambda x: x.B)
+        expected = DataFrame(
+            [[1, 4, 7, 1, 4], [2, 5, 8, 2, 5], [3, 6, 9, 3, 6]], columns=list("ABCDE")
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_assign_order(self):
+        # GH 9818
+        df = DataFrame([[1, 2], [3, 4]], columns=["A", "B"])
+        result = df.assign(D=df.A + df.B, C=df.A - df.B)
+
+        expected = DataFrame([[1, 2, 3, -1], [3, 4, 7, -1]], columns=list("ABDC"))
+        tm.assert_frame_equal(result, expected)
+        result = df.assign(C=df.A - df.B, D=df.A + df.B)
+
+        expected = DataFrame([[1, 2, -1, 3], [3, 4, -1, 7]], columns=list("ABCD"))
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_assign_bad(self):
+        df = DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})
+
+        # non-keyword argument
+        msg = r"assign\(\) takes 1 positional argument but 2 were given"
+        with pytest.raises(TypeError, match=msg):
+            df.assign(lambda x: x.A)
+        msg = "'DataFrame' object has no attribute 'C'"
+        with pytest.raises(AttributeError, match=msg):
+            df.assign(C=df.A, D=df.A + df.C)
+
+    def test_assign_dependent(self):
+        df = DataFrame({"A": [1, 2], "B": [3, 4]})
+
+        result = df.assign(C=df.A, D=lambda x: x["A"] + x["C"])
+        expected = DataFrame([[1, 3, 1, 2], [2, 4, 2, 4]], columns=list("ABCD"))
+        tm.assert_frame_equal(result, expected)
+
+        result = df.assign(C=lambda df: df.A, D=lambda df: df["A"] + df["C"])
+        expected = DataFrame([[1, 3, 1, 2], [2, 4, 2, 4]], columns=list("ABCD"))
+        tm.assert_frame_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_copy.py

@@ -0,0 +1,64 @@
+import numpy as np
+import pytest
+
+import pandas.util._test_decorators as td
+
+from pandas import DataFrame
+import pandas._testing as tm
+
+
+class TestCopy:
+    @pytest.mark.parametrize("attr", ["index", "columns"])
+    def test_copy_index_name_checking(self, float_frame, attr):
+        # don't want to be able to modify the index stored elsewhere after
+        # making a copy
+        ind = getattr(float_frame, attr)
+        ind.name = None
+        cp = float_frame.copy()
+        getattr(cp, attr).name = "foo"
+        assert getattr(float_frame, attr).name is None
+
+    @td.skip_copy_on_write_invalid_test
+    def test_copy_cache(self):
+        # GH#31784 _item_cache not cleared on copy causes incorrect reads after updates
+        df = DataFrame({"a": [1]})
+
+        df["x"] = [0]
+        df["a"]
+
+        df.copy()
+
+        df["a"].values[0] = -1
+
+        tm.assert_frame_equal(df, DataFrame({"a": [-1], "x": [0]}))
+
+        df["y"] = [0]
+
+        assert df["a"].values[0] == -1
+        tm.assert_frame_equal(df, DataFrame({"a": [-1], "x": [0], "y": [0]}))
+
+    def test_copy(self, float_frame, float_string_frame):
+        cop = float_frame.copy()
+        cop["E"] = cop["A"]
+        assert "E" not in float_frame
+
+        # copy objects
+        copy = float_string_frame.copy()
+        assert copy._mgr is not float_string_frame._mgr
+
+    @td.skip_array_manager_invalid_test
+    def test_copy_consolidates(self):
+        # GH#42477
+        df = DataFrame(
+            {
+                "a": np.random.default_rng(2).integers(0, 100, size=55),
+                "b": np.random.default_rng(2).integers(0, 100, size=55),
+            }
+        )
+
+        for i in range(10):
+            df.loc[:, f"n_{i}"] = np.random.default_rng(2).integers(0, 100, size=55)
+
+        assert len(df._mgr.blocks) == 11
+        result = df.copy()
+        assert len(result._mgr.blocks) == 1

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_fillna.py

@@ -0,0 +1,932 @@
+import numpy as np
+import pytest
+
+from pandas._config import using_pyarrow_string_dtype
+
+import pandas.util._test_decorators as td
+
+from pandas import (
+    Categorical,
+    DataFrame,
+    DatetimeIndex,
+    NaT,
+    PeriodIndex,
+    Series,
+    TimedeltaIndex,
+    Timestamp,
+    date_range,
+    to_datetime,
+)
+import pandas._testing as tm
+from pandas.tests.frame.common import _check_mixed_float
+
+
+class TestFillNA:
+    def test_fillna_dict_inplace_nonunique_columns(
+        self, using_copy_on_write, warn_copy_on_write
+    ):
+        df = DataFrame(
+            {"A": [np.nan] * 3, "B": [NaT, Timestamp(1), NaT], "C": [np.nan, "foo", 2]}
+        )
+        df.columns = ["A", "A", "A"]
+        orig = df[:]
+
+        # TODO(CoW-warn) better warning message
+        with tm.assert_cow_warning(warn_copy_on_write):
+            df.fillna({"A": 2}, inplace=True)
+        # The first and third columns can be set inplace, while the second cannot.
+
+        expected = DataFrame(
+            {"A": [2.0] * 3, "B": [2, Timestamp(1), 2], "C": [2, "foo", 2]}
+        )
+        expected.columns = ["A", "A", "A"]
+        tm.assert_frame_equal(df, expected)
+
+        # TODO: what's the expected/desired behavior with CoW?
+        if not using_copy_on_write:
+            assert tm.shares_memory(df.iloc[:, 0], orig.iloc[:, 0])
+        assert not tm.shares_memory(df.iloc[:, 1], orig.iloc[:, 1])
+        if not using_copy_on_write:
+            assert tm.shares_memory(df.iloc[:, 2], orig.iloc[:, 2])
+
+    @td.skip_array_manager_not_yet_implemented
+    def test_fillna_on_column_view(self, using_copy_on_write):
+        # GH#46149 avoid unnecessary copies
+        arr = np.full((40, 50), np.nan)
+        df = DataFrame(arr, copy=False)
+
+        if using_copy_on_write:
+            with tm.raises_chained_assignment_error():
+                df[0].fillna(-1, inplace=True)
+            assert np.isnan(arr[:, 0]).all()
+        else:
+            with tm.assert_produces_warning(FutureWarning, match="inplace method"):
+                df[0].fillna(-1, inplace=True)
+            assert (arr[:, 0] == -1).all()
+
+        # i.e. we didn't create a new 49-column block
+        assert len(df._mgr.arrays) == 1
+        assert np.shares_memory(df.values, arr)
+
+    def test_fillna_datetime(self, datetime_frame):
+        tf = datetime_frame
+        tf.loc[tf.index[:5], "A"] = np.nan
+        tf.loc[tf.index[-5:], "A"] = np.nan
+
+        zero_filled = datetime_frame.fillna(0)
+        assert (zero_filled.loc[zero_filled.index[:5], "A"] == 0).all()
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            padded = datetime_frame.fillna(method="pad")
+        assert np.isnan(padded.loc[padded.index[:5], "A"]).all()
+        assert (
+            padded.loc[padded.index[-5:], "A"] == padded.loc[padded.index[-5], "A"]
+        ).all()
+
+        msg = "Must specify a fill 'value' or 'method'"
+        with pytest.raises(ValueError, match=msg):
+            datetime_frame.fillna()
+        msg = "Cannot specify both 'value' and 'method'"
+        with pytest.raises(ValueError, match=msg):
+            datetime_frame.fillna(5, method="ffill")
+
+    @pytest.mark.xfail(using_pyarrow_string_dtype(), reason="can't fill 0 in string")
+    def test_fillna_mixed_type(self, float_string_frame):
+        mf = float_string_frame
+        mf.loc[mf.index[5:20], "foo"] = np.nan
+        mf.loc[mf.index[-10:], "A"] = np.nan
+        # TODO: make stronger assertion here, GH 25640
+        mf.fillna(value=0)
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            mf.fillna(method="pad")
+
+    def test_fillna_mixed_float(self, mixed_float_frame):
+        # mixed numeric (but no float16)
+        mf = mixed_float_frame.reindex(columns=["A", "B", "D"])
+        mf.loc[mf.index[-10:], "A"] = np.nan
+        result = mf.fillna(value=0)
+        _check_mixed_float(result, dtype={"C": None})
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = mf.fillna(method="pad")
+        _check_mixed_float(result, dtype={"C": None})
+
+    def test_fillna_empty(self, using_copy_on_write):
+        if using_copy_on_write:
+            pytest.skip("condition is unnecessary complex and is deprecated anyway")
+        # empty frame (GH#2778)
+        df = DataFrame(columns=["x"])
+        for m in ["pad", "backfill"]:
+            msg = "Series.fillna with 'method' is deprecated"
+            with tm.assert_produces_warning(FutureWarning, match=msg):
+                df.x.fillna(method=m, inplace=True)
+                df.x.fillna(method=m)
+
+    def test_fillna_different_dtype(self, using_infer_string):
+        # with different dtype (GH#3386)
+        df = DataFrame(
+            [["a", "a", np.nan, "a"], ["b", "b", np.nan, "b"], ["c", "c", np.nan, "c"]]
+        )
+
+        if using_infer_string:
+            with tm.assert_produces_warning(FutureWarning, match="Downcasting"):
+                result = df.fillna({2: "foo"})
+        else:
+            result = df.fillna({2: "foo"})
+        expected = DataFrame(
+            [["a", "a", "foo", "a"], ["b", "b", "foo", "b"], ["c", "c", "foo", "c"]]
+        )
+        tm.assert_frame_equal(result, expected)
+
+        if using_infer_string:
+            with tm.assert_produces_warning(FutureWarning, match="Downcasting"):
+                return_value = df.fillna({2: "foo"}, inplace=True)
+        else:
+            return_value = df.fillna({2: "foo"}, inplace=True)
+        tm.assert_frame_equal(df, expected)
+        assert return_value is None
+
+    def test_fillna_limit_and_value(self):
+        # limit and value
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 3)))
+        df.iloc[2:7, 0] = np.nan
+        df.iloc[3:5, 2] = np.nan
+
+        expected = df.copy()
+        expected.iloc[2, 0] = 999
+        expected.iloc[3, 2] = 999
+        result = df.fillna(999, limit=1)
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_datelike(self):
+        # with datelike
+        # GH#6344
+        df = DataFrame(
+            {
+                "Date": [NaT, Timestamp("2014-1-1")],
+                "Date2": [Timestamp("2013-1-1"), NaT],
+            }
+        )
+
+        expected = df.copy()
+        expected["Date"] = expected["Date"].fillna(df.loc[df.index[0], "Date2"])
+        result = df.fillna(value={"Date": df["Date2"]})
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_tzaware(self):
+        # with timezone
+        # GH#15855
+        df = DataFrame({"A": [Timestamp("2012-11-11 00:00:00+01:00"), NaT]})
+        exp = DataFrame(
+            {
+                "A": [
+                    Timestamp("2012-11-11 00:00:00+01:00"),
+                    Timestamp("2012-11-11 00:00:00+01:00"),
+                ]
+            }
+        )
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            res = df.fillna(method="pad")
+        tm.assert_frame_equal(res, exp)
+
+        df = DataFrame({"A": [NaT, Timestamp("2012-11-11 00:00:00+01:00")]})
+        exp = DataFrame(
+            {
+                "A": [
+                    Timestamp("2012-11-11 00:00:00+01:00"),
+                    Timestamp("2012-11-11 00:00:00+01:00"),
+                ]
+            }
+        )
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            res = df.fillna(method="bfill")
+        tm.assert_frame_equal(res, exp)
+
+    def test_fillna_tzaware_different_column(self):
+        # with timezone in another column
+        # GH#15522
+        df = DataFrame(
+            {
+                "A": date_range("20130101", periods=4, tz="US/Eastern"),
+                "B": [1, 2, np.nan, np.nan],
+            }
+        )
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna(method="pad")
+        expected = DataFrame(
+            {
+                "A": date_range("20130101", periods=4, tz="US/Eastern"),
+                "B": [1.0, 2.0, 2.0, 2.0],
+            }
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_na_actions_categorical(self):
+        cat = Categorical([1, 2, 3, np.nan], categories=[1, 2, 3])
+        vals = ["a", "b", np.nan, "d"]
+        df = DataFrame({"cats": cat, "vals": vals})
+        cat2 = Categorical([1, 2, 3, 3], categories=[1, 2, 3])
+        vals2 = ["a", "b", "b", "d"]
+        df_exp_fill = DataFrame({"cats": cat2, "vals": vals2})
+        cat3 = Categorical([1, 2, 3], categories=[1, 2, 3])
+        vals3 = ["a", "b", np.nan]
+        df_exp_drop_cats = DataFrame({"cats": cat3, "vals": vals3})
+        cat4 = Categorical([1, 2], categories=[1, 2, 3])
+        vals4 = ["a", "b"]
+        df_exp_drop_all = DataFrame({"cats": cat4, "vals": vals4})
+
+        # fillna
+        res = df.fillna(value={"cats": 3, "vals": "b"})
+        tm.assert_frame_equal(res, df_exp_fill)
+
+        msg = "Cannot setitem on a Categorical with a new category"
+        with pytest.raises(TypeError, match=msg):
+            df.fillna(value={"cats": 4, "vals": "c"})
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            res = df.fillna(method="pad")
+        tm.assert_frame_equal(res, df_exp_fill)
+
+        # dropna
+        res = df.dropna(subset=["cats"])
+        tm.assert_frame_equal(res, df_exp_drop_cats)
+
+        res = df.dropna()
+        tm.assert_frame_equal(res, df_exp_drop_all)
+
+        # make sure that fillna takes missing values into account
+        c = Categorical([np.nan, "b", np.nan], categories=["a", "b"])
+        df = DataFrame({"cats": c, "vals": [1, 2, 3]})
+
+        cat_exp = Categorical(["a", "b", "a"], categories=["a", "b"])
+        df_exp = DataFrame({"cats": cat_exp, "vals": [1, 2, 3]})
+
+        res = df.fillna("a")
+        tm.assert_frame_equal(res, df_exp)
+
+    def test_fillna_categorical_nan(self):
+        # GH#14021
+        # np.nan should always be a valid filler
+        cat = Categorical([np.nan, 2, np.nan])
+        val = Categorical([np.nan, np.nan, np.nan])
+        df = DataFrame({"cats": cat, "vals": val})
+
+        # GH#32950 df.median() is poorly behaved because there is no
+        #  Categorical.median
+        median = Series({"cats": 2.0, "vals": np.nan})
+
+        res = df.fillna(median)
+        v_exp = [np.nan, np.nan, np.nan]
+        df_exp = DataFrame({"cats": [2, 2, 2], "vals": v_exp}, dtype="category")
+        tm.assert_frame_equal(res, df_exp)
+
+        result = df.cats.fillna(np.nan)
+        tm.assert_series_equal(result, df.cats)
+
+        result = df.vals.fillna(np.nan)
+        tm.assert_series_equal(result, df.vals)
+
+        idx = DatetimeIndex(
+            ["2011-01-01 09:00", "2016-01-01 23:45", "2011-01-01 09:00", NaT, NaT]
+        )
+        df = DataFrame({"a": Categorical(idx)})
+        tm.assert_frame_equal(df.fillna(value=NaT), df)
+
+        idx = PeriodIndex(["2011-01", "2011-01", "2011-01", NaT, NaT], freq="M")
+        df = DataFrame({"a": Categorical(idx)})
+        tm.assert_frame_equal(df.fillna(value=NaT), df)
+
+        idx = TimedeltaIndex(["1 days", "2 days", "1 days", NaT, NaT])
+        df = DataFrame({"a": Categorical(idx)})
+        tm.assert_frame_equal(df.fillna(value=NaT), df)
+
+    def test_fillna_downcast(self):
+        # GH#15277
+        # infer int64 from float64
+        df = DataFrame({"a": [1.0, np.nan]})
+        msg = "The 'downcast' keyword in fillna is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna(0, downcast="infer")
+        expected = DataFrame({"a": [1, 0]})
+        tm.assert_frame_equal(result, expected)
+
+        # infer int64 from float64 when fillna value is a dict
+        df = DataFrame({"a": [1.0, np.nan]})
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna({"a": 0}, downcast="infer")
+        expected = DataFrame({"a": [1, 0]})
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_downcast_false(self, frame_or_series):
+        # GH#45603 preserve object dtype with downcast=False
+        obj = frame_or_series([1, 2, 3], dtype="object")
+        msg = "The 'downcast' keyword in fillna"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = obj.fillna("", downcast=False)
+        tm.assert_equal(result, obj)
+
+    def test_fillna_downcast_noop(self, frame_or_series):
+        # GH#45423
+        # Two relevant paths:
+        #  1) not _can_hold_na (e.g. integer)
+        #  2) _can_hold_na + noop + not can_hold_element
+
+        obj = frame_or_series([1, 2, 3], dtype=np.int64)
+
+        msg = "The 'downcast' keyword in fillna"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            # GH#40988
+            res = obj.fillna("foo", downcast=np.dtype(np.int32))
+        expected = obj.astype(np.int32)
+        tm.assert_equal(res, expected)
+
+        obj2 = obj.astype(np.float64)
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            res2 = obj2.fillna("foo", downcast="infer")
+        expected2 = obj  # get back int64
+        tm.assert_equal(res2, expected2)
+
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            # GH#40988
+            res3 = obj2.fillna("foo", downcast=np.dtype(np.int32))
+        tm.assert_equal(res3, expected)
+
+    @pytest.mark.parametrize("columns", [["A", "A", "B"], ["A", "A"]])
+    def test_fillna_dictlike_value_duplicate_colnames(self, columns):
+        # GH#43476
+        df = DataFrame(np.nan, index=[0, 1], columns=columns)
+        with tm.assert_produces_warning(None):
+            result = df.fillna({"A": 0})
+
+        expected = df.copy()
+        expected["A"] = 0.0
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_dtype_conversion(self, using_infer_string):
+        # make sure that fillna on an empty frame works
+        df = DataFrame(index=["A", "B", "C"], columns=[1, 2, 3, 4, 5])
+        result = df.dtypes
+        expected = Series([np.dtype("object")] * 5, index=[1, 2, 3, 4, 5])
+        tm.assert_series_equal(result, expected)
+
+        msg = "Downcasting object dtype arrays"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna(1)
+        expected = DataFrame(1, index=["A", "B", "C"], columns=[1, 2, 3, 4, 5])
+        tm.assert_frame_equal(result, expected)
+
+        # empty block
+        df = DataFrame(index=range(3), columns=["A", "B"], dtype="float64")
+        if using_infer_string:
+            with tm.assert_produces_warning(FutureWarning, match="Downcasting"):
+                result = df.fillna("nan")
+        else:
+            result = df.fillna("nan")
+        expected = DataFrame("nan", index=range(3), columns=["A", "B"])
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("val", ["", 1, np.nan, 1.0])
+    def test_fillna_dtype_conversion_equiv_replace(self, val):
+        df = DataFrame({"A": [1, np.nan], "B": [1.0, 2.0]})
+        expected = df.replace(np.nan, val)
+        result = df.fillna(val)
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_datetime_columns(self):
+        # GH#7095
+        df = DataFrame(
+            {
+                "A": [-1, -2, np.nan],
+                "B": date_range("20130101", periods=3),
+                "C": ["foo", "bar", None],
+                "D": ["foo2", "bar2", None],
+            },
+            index=date_range("20130110", periods=3),
+        )
+        result = df.fillna("?")
+        expected = DataFrame(
+            {
+                "A": [-1, -2, "?"],
+                "B": date_range("20130101", periods=3),
+                "C": ["foo", "bar", "?"],
+                "D": ["foo2", "bar2", "?"],
+            },
+            index=date_range("20130110", periods=3),
+        )
+        tm.assert_frame_equal(result, expected)
+
+        df = DataFrame(
+            {
+                "A": [-1, -2, np.nan],
+                "B": [Timestamp("2013-01-01"), Timestamp("2013-01-02"), NaT],
+                "C": ["foo", "bar", None],
+                "D": ["foo2", "bar2", None],
+            },
+            index=date_range("20130110", periods=3),
+        )
+        result = df.fillna("?")
+        expected = DataFrame(
+            {
+                "A": [-1, -2, "?"],
+                "B": [Timestamp("2013-01-01"), Timestamp("2013-01-02"), "?"],
+                "C": ["foo", "bar", "?"],
+                "D": ["foo2", "bar2", "?"],
+            },
+            index=date_range("20130110", periods=3),
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_ffill(self, datetime_frame):
+        datetime_frame.loc[datetime_frame.index[:5], "A"] = np.nan
+        datetime_frame.loc[datetime_frame.index[-5:], "A"] = np.nan
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            alt = datetime_frame.fillna(method="ffill")
+        tm.assert_frame_equal(datetime_frame.ffill(), alt)
+
+    def test_bfill(self, datetime_frame):
+        datetime_frame.loc[datetime_frame.index[:5], "A"] = np.nan
+        datetime_frame.loc[datetime_frame.index[-5:], "A"] = np.nan
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            alt = datetime_frame.fillna(method="bfill")
+
+        tm.assert_frame_equal(datetime_frame.bfill(), alt)
+
+    def test_frame_pad_backfill_limit(self):
+        index = np.arange(10)
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 4)), index=index)
+
+        result = df[:2].reindex(index, method="pad", limit=5)
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df[:2].reindex(index).fillna(method="pad")
+        expected.iloc[-3:] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+        result = df[-2:].reindex(index, method="backfill", limit=5)
+
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df[-2:].reindex(index).fillna(method="backfill")
+        expected.iloc[:3] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+    def test_frame_fillna_limit(self):
+        index = np.arange(10)
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 4)), index=index)
+
+        result = df[:2].reindex(index)
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = result.fillna(method="pad", limit=5)
+
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df[:2].reindex(index).fillna(method="pad")
+        expected.iloc[-3:] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+        result = df[-2:].reindex(index)
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = result.fillna(method="backfill", limit=5)
+
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df[-2:].reindex(index).fillna(method="backfill")
+        expected.iloc[:3] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_skip_certain_blocks(self):
+        # don't try to fill boolean, int blocks
+
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 4)).astype(int))
+
+        # it works!
+        df.fillna(np.nan)
+
+    @pytest.mark.parametrize("type", [int, float])
+    def test_fillna_positive_limit(self, type):
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 4))).astype(type)
+
+        msg = "Limit must be greater than 0"
+        with pytest.raises(ValueError, match=msg):
+            df.fillna(0, limit=-5)
+
+    @pytest.mark.parametrize("type", [int, float])
+    def test_fillna_integer_limit(self, type):
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 4))).astype(type)
+
+        msg = "Limit must be an integer"
+        with pytest.raises(ValueError, match=msg):
+            df.fillna(0, limit=0.5)
+
+    def test_fillna_inplace(self):
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 4)))
+        df.loc[:4, 1] = np.nan
+        df.loc[-4:, 3] = np.nan
+
+        expected = df.fillna(value=0)
+        assert expected is not df
+
+        df.fillna(value=0, inplace=True)
+        tm.assert_frame_equal(df, expected)
+
+        expected = df.fillna(value={0: 0}, inplace=True)
+        assert expected is None
+
+        df.loc[:4, 1] = np.nan
+        df.loc[-4:, 3] = np.nan
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df.fillna(method="ffill")
+        assert expected is not df
+
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            df.fillna(method="ffill", inplace=True)
+        tm.assert_frame_equal(df, expected)
+
+    def test_fillna_dict_series(self):
+        df = DataFrame(
+            {
+                "a": [np.nan, 1, 2, np.nan, np.nan],
+                "b": [1, 2, 3, np.nan, np.nan],
+                "c": [np.nan, 1, 2, 3, 4],
+            }
+        )
+
+        result = df.fillna({"a": 0, "b": 5})
+
+        expected = df.copy()
+        expected["a"] = expected["a"].fillna(0)
+        expected["b"] = expected["b"].fillna(5)
+        tm.assert_frame_equal(result, expected)
+
+        # it works
+        result = df.fillna({"a": 0, "b": 5, "d": 7})
+
+        # Series treated same as dict
+        result = df.fillna(df.max())
+        expected = df.fillna(df.max().to_dict())
+        tm.assert_frame_equal(result, expected)
+
+        # disable this for now
+        with pytest.raises(NotImplementedError, match="column by column"):
+            df.fillna(df.max(1), axis=1)
+
+    def test_fillna_dataframe(self):
+        # GH#8377
+        df = DataFrame(
+            {
+                "a": [np.nan, 1, 2, np.nan, np.nan],
+                "b": [1, 2, 3, np.nan, np.nan],
+                "c": [np.nan, 1, 2, 3, 4],
+            },
+            index=list("VWXYZ"),
+        )
+
+        # df2 may have different index and columns
+        df2 = DataFrame(
+            {
+                "a": [np.nan, 10, 20, 30, 40],
+                "b": [50, 60, 70, 80, 90],
+                "foo": ["bar"] * 5,
+            },
+            index=list("VWXuZ"),
+        )
+
+        result = df.fillna(df2)
+
+        # only those columns and indices which are shared get filled
+        expected = DataFrame(
+            {
+                "a": [np.nan, 1, 2, np.nan, 40],
+                "b": [1, 2, 3, np.nan, 90],
+                "c": [np.nan, 1, 2, 3, 4],
+            },
+            index=list("VWXYZ"),
+        )
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_columns(self):
+        arr = np.random.default_rng(2).standard_normal((10, 10))
+        arr[:, ::2] = np.nan
+        df = DataFrame(arr)
+
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna(method="ffill", axis=1)
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df.T.fillna(method="pad").T
+        tm.assert_frame_equal(result, expected)
+
+        df.insert(6, "foo", 5)
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna(method="ffill", axis=1)
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df.astype(float).fillna(method="ffill", axis=1)
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_invalid_method(self, float_frame):
+        with pytest.raises(ValueError, match="ffil"):
+            float_frame.fillna(method="ffil")
+
+    def test_fillna_invalid_value(self, float_frame):
+        # list
+        msg = '"value" parameter must be a scalar or dict, but you passed a "{}"'
+        with pytest.raises(TypeError, match=msg.format("list")):
+            float_frame.fillna([1, 2])
+        # tuple
+        with pytest.raises(TypeError, match=msg.format("tuple")):
+            float_frame.fillna((1, 2))
+        # frame with series
+        msg = (
+            '"value" parameter must be a scalar, dict or Series, but you '
+            'passed a "DataFrame"'
+        )
+        with pytest.raises(TypeError, match=msg):
+            float_frame.iloc[:, 0].fillna(float_frame)
+
+    def test_fillna_col_reordering(self):
+        cols = ["COL." + str(i) for i in range(5, 0, -1)]
+        data = np.random.default_rng(2).random((20, 5))
+        df = DataFrame(index=range(20), columns=cols, data=data)
+        msg = "DataFrame.fillna with 'method' is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            filled = df.fillna(method="ffill")
+        assert df.columns.tolist() == filled.columns.tolist()
+
+    @pytest.mark.xfail(using_pyarrow_string_dtype(), reason="can't fill 0 in string")
+    def test_fill_corner(self, float_frame, float_string_frame):
+        mf = float_string_frame
+        mf.loc[mf.index[5:20], "foo"] = np.nan
+        mf.loc[mf.index[-10:], "A"] = np.nan
+
+        filled = float_string_frame.fillna(value=0)
+        assert (filled.loc[filled.index[5:20], "foo"] == 0).all()
+        del float_string_frame["foo"]
+
+        float_frame.reindex(columns=[]).fillna(value=0)
+
+    def test_fillna_downcast_dict(self):
+        # GH#40809
+        df = DataFrame({"col1": [1, np.nan]})
+
+        msg = "The 'downcast' keyword in fillna"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = df.fillna({"col1": 2}, downcast={"col1": "int64"})
+        expected = DataFrame({"col1": [1, 2]})
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_with_columns_and_limit(self):
+        # GH40989
+        df = DataFrame(
+            [
+                [np.nan, 2, np.nan, 0],
+                [3, 4, np.nan, 1],
+                [np.nan, np.nan, np.nan, 5],
+                [np.nan, 3, np.nan, 4],
+            ],
+            columns=list("ABCD"),
+        )
+        result = df.fillna(axis=1, value=100, limit=1)
+        result2 = df.fillna(axis=1, value=100, limit=2)
+
+        expected = DataFrame(
+            {
+                "A": Series([100, 3, 100, 100], dtype="float64"),
+                "B": [2, 4, np.nan, 3],
+                "C": [np.nan, 100, np.nan, np.nan],
+                "D": Series([0, 1, 5, 4], dtype="float64"),
+            },
+            index=[0, 1, 2, 3],
+        )
+        expected2 = DataFrame(
+            {
+                "A": Series([100, 3, 100, 100], dtype="float64"),
+                "B": Series([2, 4, 100, 3], dtype="float64"),
+                "C": [100, 100, np.nan, 100],
+                "D": Series([0, 1, 5, 4], dtype="float64"),
+            },
+            index=[0, 1, 2, 3],
+        )
+
+        tm.assert_frame_equal(result, expected)
+        tm.assert_frame_equal(result2, expected2)
+
+    def test_fillna_datetime_inplace(self):
+        # GH#48863
+        df = DataFrame(
+            {
+                "date1": to_datetime(["2018-05-30", None]),
+                "date2": to_datetime(["2018-09-30", None]),
+            }
+        )
+        expected = df.copy()
+        df.fillna(np.nan, inplace=True)
+        tm.assert_frame_equal(df, expected)
+
+    def test_fillna_inplace_with_columns_limit_and_value(self):
+        # GH40989
+        df = DataFrame(
+            [
+                [np.nan, 2, np.nan, 0],
+                [3, 4, np.nan, 1],
+                [np.nan, np.nan, np.nan, 5],
+                [np.nan, 3, np.nan, 4],
+            ],
+            columns=list("ABCD"),
+        )
+
+        expected = df.fillna(axis=1, value=100, limit=1)
+        assert expected is not df
+
+        df.fillna(axis=1, value=100, limit=1, inplace=True)
+        tm.assert_frame_equal(df, expected)
+
+    @td.skip_array_manager_invalid_test
+    @pytest.mark.parametrize("val", [-1, {"x": -1, "y": -1}])
+    def test_inplace_dict_update_view(
+        self, val, using_copy_on_write, warn_copy_on_write
+    ):
+        # GH#47188
+        df = DataFrame({"x": [np.nan, 2], "y": [np.nan, 2]})
+        df_orig = df.copy()
+        result_view = df[:]
+        with tm.assert_cow_warning(warn_copy_on_write):
+            df.fillna(val, inplace=True)
+        expected = DataFrame({"x": [-1, 2.0], "y": [-1.0, 2]})
+        tm.assert_frame_equal(df, expected)
+        if using_copy_on_write:
+            tm.assert_frame_equal(result_view, df_orig)
+        else:
+            tm.assert_frame_equal(result_view, expected)
+
+    def test_single_block_df_with_horizontal_axis(self):
+        # GH 47713
+        df = DataFrame(
+            {
+                "col1": [5, 0, np.nan, 10, np.nan],
+                "col2": [7, np.nan, np.nan, 5, 3],
+                "col3": [12, np.nan, 1, 2, 0],
+                "col4": [np.nan, 1, 1, np.nan, 18],
+            }
+        )
+        result = df.fillna(50, limit=1, axis=1)
+        expected = DataFrame(
+            [
+                [5.0, 7.0, 12.0, 50.0],
+                [0.0, 50.0, np.nan, 1.0],
+                [50.0, np.nan, 1.0, 1.0],
+                [10.0, 5.0, 2.0, 50.0],
+                [50.0, 3.0, 0.0, 18.0],
+            ],
+            columns=["col1", "col2", "col3", "col4"],
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_fillna_with_multi_index_frame(self):
+        # GH 47649
+        pdf = DataFrame(
+            {
+                ("x", "a"): [np.nan, 2.0, 3.0],
+                ("x", "b"): [1.0, 2.0, np.nan],
+                ("y", "c"): [1.0, 2.0, np.nan],
+            }
+        )
+        expected = DataFrame(
+            {
+                ("x", "a"): [-1.0, 2.0, 3.0],
+                ("x", "b"): [1.0, 2.0, -1.0],
+                ("y", "c"): [1.0, 2.0, np.nan],
+            }
+        )
+        tm.assert_frame_equal(pdf.fillna({"x": -1}), expected)
+        tm.assert_frame_equal(pdf.fillna({"x": -1, ("x", "b"): -2}), expected)
+
+        expected = DataFrame(
+            {
+                ("x", "a"): [-1.0, 2.0, 3.0],
+                ("x", "b"): [1.0, 2.0, -2.0],
+                ("y", "c"): [1.0, 2.0, np.nan],
+            }
+        )
+        tm.assert_frame_equal(pdf.fillna({("x", "b"): -2, "x": -1}), expected)
+
+
+def test_fillna_nonconsolidated_frame():
+    # https://github.com/pandas-dev/pandas/issues/36495
+    df = DataFrame(
+        [
+            [1, 1, 1, 1.0],
+            [2, 2, 2, 2.0],
+            [3, 3, 3, 3.0],
+        ],
+        columns=["i1", "i2", "i3", "f1"],
+    )
+    df_nonconsol = df.pivot(index="i1", columns="i2")
+    result = df_nonconsol.fillna(0)
+    assert result.isna().sum().sum() == 0
+
+
+def test_fillna_nones_inplace():
+    # GH 48480
+    df = DataFrame(
+        [[None, None], [None, None]],
+        columns=["A", "B"],
+    )
+    msg = "Downcasting object dtype arrays"
+    with tm.assert_produces_warning(FutureWarning, match=msg):
+        df.fillna(value={"A": 1, "B": 2}, inplace=True)
+
+    expected = DataFrame([[1, 2], [1, 2]], columns=["A", "B"])
+    tm.assert_frame_equal(df, expected)
+
+
+@pytest.mark.parametrize("func", ["pad", "backfill"])
+def test_pad_backfill_deprecated(func):
+    # GH#33396
+    df = DataFrame({"a": [1, 2, 3]})
+    with tm.assert_produces_warning(FutureWarning):
+        getattr(df, func)()
+
+
+@pytest.mark.parametrize(
+    "data, expected_data, method, kwargs",
+    (
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, np.nan, 3.0, 3.0, 3.0, 3.0, 7.0, np.nan, np.nan],
+            "ffill",
+            {"limit_area": "inside"},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, np.nan, 3.0, 3.0, np.nan, np.nan, 7.0, np.nan, np.nan],
+            "ffill",
+            {"limit_area": "inside", "limit": 1},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, np.nan, 3.0, np.nan, np.nan, np.nan, 7.0, 7.0, 7.0],
+            "ffill",
+            {"limit_area": "outside"},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, np.nan, 3.0, np.nan, np.nan, np.nan, 7.0, 7.0, np.nan],
+            "ffill",
+            {"limit_area": "outside", "limit": 1},
+        ),
+        (
+            [np.nan, np.nan, np.nan, np.nan, np.nan, np.nan, np.nan],
+            [np.nan, np.nan, np.nan, np.nan, np.nan, np.nan, np.nan],
+            "ffill",
+            {"limit_area": "outside", "limit": 1},
+        ),
+        (
+            range(5),
+            range(5),
+            "ffill",
+            {"limit_area": "outside", "limit": 1},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, np.nan, 3.0, 7.0, 7.0, 7.0, 7.0, np.nan, np.nan],
+            "bfill",
+            {"limit_area": "inside"},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, np.nan, 3.0, np.nan, np.nan, 7.0, 7.0, np.nan, np.nan],
+            "bfill",
+            {"limit_area": "inside", "limit": 1},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [3.0, 3.0, 3.0, np.nan, np.nan, np.nan, 7.0, np.nan, np.nan],
+            "bfill",
+            {"limit_area": "outside"},
+        ),
+        (
+            [np.nan, np.nan, 3, np.nan, np.nan, np.nan, 7, np.nan, np.nan],
+            [np.nan, 3.0, 3.0, np.nan, np.nan, np.nan, 7.0, np.nan, np.nan],
+            "bfill",
+            {"limit_area": "outside", "limit": 1},
+        ),
+    ),
+)
+def test_ffill_bfill_limit_area(data, expected_data, method, kwargs):
+    # GH#56492
+    df = DataFrame(data)
+    expected = DataFrame(expected_data)
+    result = getattr(df, method)(**kwargs)
+    tm.assert_frame_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_first_valid_index.py

@@ -0,0 +1,78 @@
+"""
+Includes test for last_valid_index.
+"""
+import numpy as np
+import pytest
+
+from pandas import (
+    DataFrame,
+    Index,
+    Series,
+    date_range,
+)
+
+
+class TestFirstValidIndex:
+    def test_first_valid_index_single_nan(self, frame_or_series):
+        # GH#9752 Series/DataFrame should both return None, not raise
+        obj = frame_or_series([np.nan])
+
+        assert obj.first_valid_index() is None
+        assert obj.iloc[:0].first_valid_index() is None
+
+    @pytest.mark.parametrize(
+        "empty", [DataFrame(), Series(dtype=object), Series([], index=[], dtype=object)]
+    )
+    def test_first_valid_index_empty(self, empty):
+        # GH#12800
+        assert empty.last_valid_index() is None
+        assert empty.first_valid_index() is None
+
+    @pytest.mark.parametrize(
+        "data,idx,expected_first,expected_last",
+        [
+            ({"A": [1, 2, 3]}, [1, 1, 2], 1, 2),
+            ({"A": [1, 2, 3]}, [1, 2, 2], 1, 2),
+            ({"A": [1, 2, 3, 4]}, ["d", "d", "d", "d"], "d", "d"),
+            ({"A": [1, np.nan, 3]}, [1, 1, 2], 1, 2),
+            ({"A": [np.nan, np.nan, 3]}, [1, 1, 2], 2, 2),
+            ({"A": [1, np.nan, 3]}, [1, 2, 2], 1, 2),
+        ],
+    )
+    def test_first_last_valid_frame(self, data, idx, expected_first, expected_last):
+        # GH#21441
+        df = DataFrame(data, index=idx)
+        assert expected_first == df.first_valid_index()
+        assert expected_last == df.last_valid_index()
+
+    @pytest.mark.parametrize(
+        "index",
+        [Index([str(i) for i in range(20)]), date_range("2020-01-01", periods=20)],
+    )
+    def test_first_last_valid(self, index):
+        mat = np.random.default_rng(2).standard_normal(len(index))
+        mat[:5] = np.nan
+        mat[-5:] = np.nan
+
+        frame = DataFrame({"foo": mat}, index=index)
+        assert frame.first_valid_index() == frame.index[5]
+        assert frame.last_valid_index() == frame.index[-6]
+
+        ser = frame["foo"]
+        assert ser.first_valid_index() == frame.index[5]
+        assert ser.last_valid_index() == frame.index[-6]
+
+    @pytest.mark.parametrize(
+        "index",
+        [Index([str(i) for i in range(10)]), date_range("2020-01-01", periods=10)],
+    )
+    def test_first_last_valid_all_nan(self, index):
+        # GH#17400: no valid entries
+        frame = DataFrame(np.nan, columns=["foo"], index=index)
+
+        assert frame.last_valid_index() is None
+        assert frame.first_valid_index() is None
+
+        ser = frame["foo"]
+        assert ser.first_valid_index() is None
+        assert ser.last_valid_index() is None

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_map.py

@@ -0,0 +1,216 @@
+from datetime import datetime
+
+import numpy as np
+import pytest
+
+import pandas as pd
+from pandas import (
+    DataFrame,
+    Series,
+    Timestamp,
+    date_range,
+)
+import pandas._testing as tm
+
+from pandas.tseries.offsets import BDay
+
+
+def test_map(float_frame):
+    result = float_frame.map(lambda x: x * 2)
+    tm.assert_frame_equal(result, float_frame * 2)
+    float_frame.map(type)
+
+    # GH 465: function returning tuples
+    result = float_frame.map(lambda x: (x, x))["A"].iloc[0]
+    assert isinstance(result, tuple)
+
+
+@pytest.mark.parametrize("val", [1, 1.0])
+def test_map_float_object_conversion(val):
+    # GH 2909: object conversion to float in constructor?
+    df = DataFrame(data=[val, "a"])
+    result = df.map(lambda x: x).dtypes[0]
+    assert result == object
+
+
+@pytest.mark.parametrize("na_action", [None, "ignore"])
+def test_map_keeps_dtype(na_action):
+    # GH52219
+    arr = Series(["a", np.nan, "b"])
+    sparse_arr = arr.astype(pd.SparseDtype(object))
+    df = DataFrame(data={"a": arr, "b": sparse_arr})
+
+    def func(x):
+        return str.upper(x) if not pd.isna(x) else x
+
+    result = df.map(func, na_action=na_action)
+
+    expected_sparse = pd.array(["A", np.nan, "B"], dtype=pd.SparseDtype(object))
+    expected_arr = expected_sparse.astype(object)
+    expected = DataFrame({"a": expected_arr, "b": expected_sparse})
+
+    tm.assert_frame_equal(result, expected)
+
+    result_empty = df.iloc[:0, :].map(func, na_action=na_action)
+    expected_empty = expected.iloc[:0, :]
+    tm.assert_frame_equal(result_empty, expected_empty)
+
+
+def test_map_str():
+    # GH 2786
+    df = DataFrame(np.random.default_rng(2).random((3, 4)))
+    df2 = df.copy()
+    cols = ["a", "a", "a", "a"]
+    df.columns = cols
+
+    expected = df2.map(str)
+    expected.columns = cols
+    result = df.map(str)
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize(
+    "col, val",
+    [["datetime", Timestamp("20130101")], ["timedelta", pd.Timedelta("1 min")]],
+)
+def test_map_datetimelike(col, val):
+    # datetime/timedelta
+    df = DataFrame(np.random.default_rng(2).random((3, 4)))
+    df[col] = val
+    result = df.map(str)
+    assert result.loc[0, col] == str(df.loc[0, col])
+
+
+@pytest.mark.parametrize(
+    "expected",
+    [
+        DataFrame(),
+        DataFrame(columns=list("ABC")),
+        DataFrame(index=list("ABC")),
+        DataFrame({"A": [], "B": [], "C": []}),
+    ],
+)
+@pytest.mark.parametrize("func", [round, lambda x: x])
+def test_map_empty(expected, func):
+    # GH 8222
+    result = expected.map(func)
+    tm.assert_frame_equal(result, expected)
+
+
+def test_map_kwargs():
+    # GH 40652
+    result = DataFrame([[1, 2], [3, 4]]).map(lambda x, y: x + y, y=2)
+    expected = DataFrame([[3, 4], [5, 6]])
+    tm.assert_frame_equal(result, expected)
+
+
+def test_map_na_ignore(float_frame):
+    # GH 23803
+    strlen_frame = float_frame.map(lambda x: len(str(x)))
+    float_frame_with_na = float_frame.copy()
+    mask = np.random.default_rng(2).integers(0, 2, size=float_frame.shape, dtype=bool)
+    float_frame_with_na[mask] = pd.NA
+    strlen_frame_na_ignore = float_frame_with_na.map(
+        lambda x: len(str(x)), na_action="ignore"
+    )
+    # Set float64 type to avoid upcast when setting NA below
+    strlen_frame_with_na = strlen_frame.copy().astype("float64")
+    strlen_frame_with_na[mask] = pd.NA
+    tm.assert_frame_equal(strlen_frame_na_ignore, strlen_frame_with_na)
+
+
+def test_map_box_timestamps():
+    # GH 2689, GH 2627
+    ser = Series(date_range("1/1/2000", periods=10))
+
+    def func(x):
+        return (x.hour, x.day, x.month)
+
+    # it works!
+    DataFrame(ser).map(func)
+
+
+def test_map_box():
+    # ufunc will not be boxed. Same test cases as the test_map_box
+    df = DataFrame(
+        {
+            "a": [Timestamp("2011-01-01"), Timestamp("2011-01-02")],
+            "b": [
+                Timestamp("2011-01-01", tz="US/Eastern"),
+                Timestamp("2011-01-02", tz="US/Eastern"),
+            ],
+            "c": [pd.Timedelta("1 days"), pd.Timedelta("2 days")],
+            "d": [
+                pd.Period("2011-01-01", freq="M"),
+                pd.Period("2011-01-02", freq="M"),
+            ],
+        }
+    )
+
+    result = df.map(lambda x: type(x).__name__)
+    expected = DataFrame(
+        {
+            "a": ["Timestamp", "Timestamp"],
+            "b": ["Timestamp", "Timestamp"],
+            "c": ["Timedelta", "Timedelta"],
+            "d": ["Period", "Period"],
+        }
+    )
+    tm.assert_frame_equal(result, expected)
+
+
+def test_frame_map_dont_convert_datetime64():
+    df = DataFrame({"x1": [datetime(1996, 1, 1)]})
+
+    df = df.map(lambda x: x + BDay())
+    df = df.map(lambda x: x + BDay())
+
+    result = df.x1.dtype
+    assert result == "M8[ns]"
+
+
+def test_map_function_runs_once():
+    df = DataFrame({"a": [1, 2, 3]})
+    values = []  # Save values function is applied to
+
+    def reducing_function(val):
+        values.append(val)
+
+    def non_reducing_function(val):
+        values.append(val)
+        return val
+
+    for func in [reducing_function, non_reducing_function]:
+        del values[:]
+
+        df.map(func)
+        assert values == df.a.to_list()
+
+
+def test_map_type():
+    # GH 46719
+    df = DataFrame(
+        {"col1": [3, "string", float], "col2": [0.25, datetime(2020, 1, 1), np.nan]},
+        index=["a", "b", "c"],
+    )
+
+    result = df.map(type)
+    expected = DataFrame(
+        {"col1": [int, str, type], "col2": [float, datetime, float]},
+        index=["a", "b", "c"],
+    )
+    tm.assert_frame_equal(result, expected)
+
+
+def test_map_invalid_na_action(float_frame):
+    # GH 23803
+    with pytest.raises(ValueError, match="na_action must be .*Got 'abc'"):
+        float_frame.map(lambda x: len(str(x)), na_action="abc")
+
+
+def test_applymap_deprecated():
+    # GH52353
+    df = DataFrame({"a": [1, 2, 3]})
+    msg = "DataFrame.applymap has been deprecated. Use DataFrame.map instead."
+    with tm.assert_produces_warning(FutureWarning, match=msg):
+        df.applymap(lambda x: x)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_quantile.py

@@ -0,0 +1,972 @@
+import numpy as np
+import pytest
+
+import pandas as pd
+from pandas import (
+    DataFrame,
+    Index,
+    Series,
+    Timestamp,
+)
+import pandas._testing as tm
+
+
+@pytest.fixture(
+    params=[["linear", "single"], ["nearest", "table"]], ids=lambda x: "-".join(x)
+)
+def interp_method(request):
+    """(interpolation, method) arguments for quantile"""
+    return request.param
+
+
+class TestDataFrameQuantile:
+    @pytest.mark.parametrize(
+        "df,expected",
+        [
+            [
+                DataFrame(
+                    {
+                        0: Series(pd.arrays.SparseArray([1, 2])),
+                        1: Series(pd.arrays.SparseArray([3, 4])),
+                    }
+                ),
+                Series([1.5, 3.5], name=0.5),
+            ],
+            [
+                DataFrame(Series([0.0, None, 1.0, 2.0], dtype="Sparse[float]")),
+                Series([1.0], name=0.5),
+            ],
+        ],
+    )
+    def test_quantile_sparse(self, df, expected):
+        # GH#17198
+        # GH#24600
+        result = df.quantile()
+        expected = expected.astype("Sparse[float]")
+        tm.assert_series_equal(result, expected)
+
+    def test_quantile(
+        self, datetime_frame, interp_method, using_array_manager, request
+    ):
+        interpolation, method = interp_method
+        df = datetime_frame
+        result = df.quantile(
+            0.1, axis=0, numeric_only=True, interpolation=interpolation, method=method
+        )
+        expected = Series(
+            [np.percentile(df[col], 10) for col in df.columns],
+            index=df.columns,
+            name=0.1,
+        )
+        if interpolation == "linear":
+            # np.percentile values only comparable to linear interpolation
+            tm.assert_series_equal(result, expected)
+        else:
+            tm.assert_index_equal(result.index, expected.index)
+            request.applymarker(
+                pytest.mark.xfail(
+                    using_array_manager, reason="Name set incorrectly for arraymanager"
+                )
+            )
+            assert result.name == expected.name
+
+        result = df.quantile(
+            0.9, axis=1, numeric_only=True, interpolation=interpolation, method=method
+        )
+        expected = Series(
+            [np.percentile(df.loc[date], 90) for date in df.index],
+            index=df.index,
+            name=0.9,
+        )
+        if interpolation == "linear":
+            # np.percentile values only comparable to linear interpolation
+            tm.assert_series_equal(result, expected)
+        else:
+            tm.assert_index_equal(result.index, expected.index)
+            request.applymarker(
+                pytest.mark.xfail(
+                    using_array_manager, reason="Name set incorrectly for arraymanager"
+                )
+            )
+            assert result.name == expected.name
+
+    def test_empty(self, interp_method):
+        interpolation, method = interp_method
+        q = DataFrame({"x": [], "y": []}).quantile(
+            0.1, axis=0, numeric_only=True, interpolation=interpolation, method=method
+        )
+        assert np.isnan(q["x"]) and np.isnan(q["y"])
+
+    def test_non_numeric_exclusion(self, interp_method, request, using_array_manager):
+        interpolation, method = interp_method
+        df = DataFrame({"col1": ["A", "A", "B", "B"], "col2": [1, 2, 3, 4]})
+        rs = df.quantile(
+            0.5, numeric_only=True, interpolation=interpolation, method=method
+        )
+        xp = df.median(numeric_only=True).rename(0.5)
+        if interpolation == "nearest":
+            xp = (xp + 0.5).astype(np.int64)
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        tm.assert_series_equal(rs, xp)
+
+    def test_axis(self, interp_method, request, using_array_manager):
+        # axis
+        interpolation, method = interp_method
+        df = DataFrame({"A": [1, 2, 3], "B": [2, 3, 4]}, index=[1, 2, 3])
+        result = df.quantile(0.5, axis=1, interpolation=interpolation, method=method)
+        expected = Series([1.5, 2.5, 3.5], index=[1, 2, 3], name=0.5)
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        tm.assert_series_equal(result, expected)
+
+        result = df.quantile(
+            [0.5, 0.75], axis=1, interpolation=interpolation, method=method
+        )
+        expected = DataFrame(
+            {1: [1.5, 1.75], 2: [2.5, 2.75], 3: [3.5, 3.75]}, index=[0.5, 0.75]
+        )
+        if interpolation == "nearest":
+            expected.iloc[0, :] -= 0.5
+            expected.iloc[1, :] += 0.25
+            expected = expected.astype(np.int64)
+        tm.assert_frame_equal(result, expected, check_index_type=True)
+
+    def test_axis_numeric_only_true(self, interp_method, request, using_array_manager):
+        # We may want to break API in the future to change this
+        # so that we exclude non-numeric along the same axis
+        # See GH #7312
+        interpolation, method = interp_method
+        df = DataFrame([[1, 2, 3], ["a", "b", 4]])
+        result = df.quantile(
+            0.5, axis=1, numeric_only=True, interpolation=interpolation, method=method
+        )
+        expected = Series([3.0, 4.0], index=[0, 1], name=0.5)
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        tm.assert_series_equal(result, expected)
+
+    def test_quantile_date_range(self, interp_method, request, using_array_manager):
+        # GH 2460
+        interpolation, method = interp_method
+        dti = pd.date_range("2016-01-01", periods=3, tz="US/Pacific")
+        ser = Series(dti)
+        df = DataFrame(ser)
+
+        result = df.quantile(
+            numeric_only=False, interpolation=interpolation, method=method
+        )
+        expected = Series(
+            ["2016-01-02 00:00:00"], name=0.5, dtype="datetime64[ns, US/Pacific]"
+        )
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+
+        tm.assert_series_equal(result, expected)
+
+    def test_quantile_axis_mixed(self, interp_method, request, using_array_manager):
+        # mixed on axis=1
+        interpolation, method = interp_method
+        df = DataFrame(
+            {
+                "A": [1, 2, 3],
+                "B": [2.0, 3.0, 4.0],
+                "C": pd.date_range("20130101", periods=3),
+                "D": ["foo", "bar", "baz"],
+            }
+        )
+        result = df.quantile(
+            0.5, axis=1, numeric_only=True, interpolation=interpolation, method=method
+        )
+        expected = Series([1.5, 2.5, 3.5], name=0.5)
+        if interpolation == "nearest":
+            expected -= 0.5
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        tm.assert_series_equal(result, expected)
+
+        # must raise
+        msg = "'<' not supported between instances of 'Timestamp' and 'float'"
+        with pytest.raises(TypeError, match=msg):
+            df.quantile(0.5, axis=1, numeric_only=False)
+
+    def test_quantile_axis_parameter(self, interp_method, request, using_array_manager):
+        # GH 9543/9544
+        interpolation, method = interp_method
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        df = DataFrame({"A": [1, 2, 3], "B": [2, 3, 4]}, index=[1, 2, 3])
+
+        result = df.quantile(0.5, axis=0, interpolation=interpolation, method=method)
+
+        expected = Series([2.0, 3.0], index=["A", "B"], name=0.5)
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        tm.assert_series_equal(result, expected)
+
+        expected = df.quantile(
+            0.5, axis="index", interpolation=interpolation, method=method
+        )
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        tm.assert_series_equal(result, expected)
+
+        result = df.quantile(0.5, axis=1, interpolation=interpolation, method=method)
+
+        expected = Series([1.5, 2.5, 3.5], index=[1, 2, 3], name=0.5)
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        tm.assert_series_equal(result, expected)
+
+        result = df.quantile(
+            0.5, axis="columns", interpolation=interpolation, method=method
+        )
+        tm.assert_series_equal(result, expected)
+
+        msg = "No axis named -1 for object type DataFrame"
+        with pytest.raises(ValueError, match=msg):
+            df.quantile(0.1, axis=-1, interpolation=interpolation, method=method)
+        msg = "No axis named column for object type DataFrame"
+        with pytest.raises(ValueError, match=msg):
+            df.quantile(0.1, axis="column")
+
+    def test_quantile_interpolation(self):
+        # see gh-10174
+
+        # interpolation method other than default linear
+        df = DataFrame({"A": [1, 2, 3], "B": [2, 3, 4]}, index=[1, 2, 3])
+        result = df.quantile(0.5, axis=1, interpolation="nearest")
+        expected = Series([1, 2, 3], index=[1, 2, 3], name=0.5)
+        tm.assert_series_equal(result, expected)
+
+        # cross-check interpolation=nearest results in original dtype
+        exp = np.percentile(
+            np.array([[1, 2, 3], [2, 3, 4]]),
+            0.5,
+            axis=0,
+            method="nearest",
+        )
+        expected = Series(exp, index=[1, 2, 3], name=0.5, dtype="int64")
+        tm.assert_series_equal(result, expected)
+
+        # float
+        df = DataFrame({"A": [1.0, 2.0, 3.0], "B": [2.0, 3.0, 4.0]}, index=[1, 2, 3])
+        result = df.quantile(0.5, axis=1, interpolation="nearest")
+        expected = Series([1.0, 2.0, 3.0], index=[1, 2, 3], name=0.5)
+        tm.assert_series_equal(result, expected)
+        exp = np.percentile(
+            np.array([[1.0, 2.0, 3.0], [2.0, 3.0, 4.0]]),
+            0.5,
+            axis=0,
+            method="nearest",
+        )
+        expected = Series(exp, index=[1, 2, 3], name=0.5, dtype="float64")
+        tm.assert_series_equal(result, expected)
+
+        # axis
+        result = df.quantile([0.5, 0.75], axis=1, interpolation="lower")
+        expected = DataFrame(
+            {1: [1.0, 1.0], 2: [2.0, 2.0], 3: [3.0, 3.0]}, index=[0.5, 0.75]
+        )
+        tm.assert_frame_equal(result, expected)
+
+        # test degenerate case
+        df = DataFrame({"x": [], "y": []})
+        q = df.quantile(0.1, axis=0, interpolation="higher")
+        assert np.isnan(q["x"]) and np.isnan(q["y"])
+
+        # multi
+        df = DataFrame([[1, 1, 1], [2, 2, 2], [3, 3, 3]], columns=["a", "b", "c"])
+        result = df.quantile([0.25, 0.5], interpolation="midpoint")
+
+        # https://github.com/numpy/numpy/issues/7163
+        expected = DataFrame(
+            [[1.5, 1.5, 1.5], [2.0, 2.0, 2.0]],
+            index=[0.25, 0.5],
+            columns=["a", "b", "c"],
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_quantile_interpolation_datetime(self, datetime_frame):
+        # see gh-10174
+
+        # interpolation = linear (default case)
+        df = datetime_frame
+        q = df.quantile(0.1, axis=0, numeric_only=True, interpolation="linear")
+        assert q["A"] == np.percentile(df["A"], 10)
+
+    def test_quantile_interpolation_int(self, int_frame):
+        # see gh-10174
+
+        df = int_frame
+        # interpolation = linear (default case)
+        q = df.quantile(0.1)
+        assert q["A"] == np.percentile(df["A"], 10)
+
+        # test with and without interpolation keyword
+        q1 = df.quantile(0.1, axis=0, interpolation="linear")
+        assert q1["A"] == np.percentile(df["A"], 10)
+        tm.assert_series_equal(q, q1)
+
+    def test_quantile_multi(self, interp_method, request, using_array_manager):
+        interpolation, method = interp_method
+        df = DataFrame([[1, 1, 1], [2, 2, 2], [3, 3, 3]], columns=["a", "b", "c"])
+        result = df.quantile([0.25, 0.5], interpolation=interpolation, method=method)
+        expected = DataFrame(
+            [[1.5, 1.5, 1.5], [2.0, 2.0, 2.0]],
+            index=[0.25, 0.5],
+            columns=["a", "b", "c"],
+        )
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        tm.assert_frame_equal(result, expected)
+
+    def test_quantile_multi_axis_1(self, interp_method, request, using_array_manager):
+        interpolation, method = interp_method
+        df = DataFrame([[1, 1, 1], [2, 2, 2], [3, 3, 3]], columns=["a", "b", "c"])
+        result = df.quantile(
+            [0.25, 0.5], axis=1, interpolation=interpolation, method=method
+        )
+        expected = DataFrame(
+            [[1.0, 2.0, 3.0]] * 2, index=[0.25, 0.5], columns=[0, 1, 2]
+        )
+        if interpolation == "nearest":
+            expected = expected.astype(np.int64)
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        tm.assert_frame_equal(result, expected)
+
+    def test_quantile_multi_empty(self, interp_method):
+        interpolation, method = interp_method
+        result = DataFrame({"x": [], "y": []}).quantile(
+            [0.1, 0.9], axis=0, interpolation=interpolation, method=method
+        )
+        expected = DataFrame(
+            {"x": [np.nan, np.nan], "y": [np.nan, np.nan]}, index=[0.1, 0.9]
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_quantile_datetime(self, unit):
+        dti = pd.to_datetime(["2010", "2011"]).as_unit(unit)
+        df = DataFrame({"a": dti, "b": [0, 5]})
+
+        # exclude datetime
+        result = df.quantile(0.5, numeric_only=True)
+        expected = Series([2.5], index=["b"], name=0.5)
+        tm.assert_series_equal(result, expected)
+
+        # datetime
+        result = df.quantile(0.5, numeric_only=False)
+        expected = Series(
+            [Timestamp("2010-07-02 12:00:00"), 2.5], index=["a", "b"], name=0.5
+        )
+        tm.assert_series_equal(result, expected)
+
+        # datetime w/ multi
+        result = df.quantile([0.5], numeric_only=False)
+        expected = DataFrame(
+            {"a": Timestamp("2010-07-02 12:00:00").as_unit(unit), "b": 2.5},
+            index=[0.5],
+        )
+        tm.assert_frame_equal(result, expected)
+
+        # axis = 1
+        df["c"] = pd.to_datetime(["2011", "2012"]).as_unit(unit)
+        result = df[["a", "c"]].quantile(0.5, axis=1, numeric_only=False)
+        expected = Series(
+            [Timestamp("2010-07-02 12:00:00"), Timestamp("2011-07-02 12:00:00")],
+            index=[0, 1],
+            name=0.5,
+            dtype=f"M8[{unit}]",
+        )
+        tm.assert_series_equal(result, expected)
+
+        result = df[["a", "c"]].quantile([0.5], axis=1, numeric_only=False)
+        expected = DataFrame(
+            [[Timestamp("2010-07-02 12:00:00"), Timestamp("2011-07-02 12:00:00")]],
+            index=[0.5],
+            columns=[0, 1],
+            dtype=f"M8[{unit}]",
+        )
+        tm.assert_frame_equal(result, expected)
+
+        # empty when numeric_only=True
+        result = df[["a", "c"]].quantile(0.5, numeric_only=True)
+        expected = Series([], index=[], dtype=np.float64, name=0.5)
+        tm.assert_series_equal(result, expected)
+
+        result = df[["a", "c"]].quantile([0.5], numeric_only=True)
+        expected = DataFrame(index=[0.5], columns=[])
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "dtype",
+        [
+            "datetime64[ns]",
+            "datetime64[ns, US/Pacific]",
+            "timedelta64[ns]",
+            "Period[D]",
+        ],
+    )
+    def test_quantile_dt64_empty(self, dtype, interp_method):
+        # GH#41544
+        interpolation, method = interp_method
+        df = DataFrame(columns=["a", "b"], dtype=dtype)
+
+        res = df.quantile(
+            0.5, axis=1, numeric_only=False, interpolation=interpolation, method=method
+        )
+        expected = Series([], index=[], name=0.5, dtype=dtype)
+        tm.assert_series_equal(res, expected)
+
+        # no columns in result, so no dtype preservation
+        res = df.quantile(
+            [0.5],
+            axis=1,
+            numeric_only=False,
+            interpolation=interpolation,
+            method=method,
+        )
+        expected = DataFrame(index=[0.5], columns=[])
+        tm.assert_frame_equal(res, expected)
+
+    @pytest.mark.parametrize("invalid", [-1, 2, [0.5, -1], [0.5, 2]])
+    def test_quantile_invalid(self, invalid, datetime_frame, interp_method):
+        msg = "percentiles should all be in the interval \\[0, 1\\]"
+        interpolation, method = interp_method
+        with pytest.raises(ValueError, match=msg):
+            datetime_frame.quantile(invalid, interpolation=interpolation, method=method)
+
+    def test_quantile_box(self, interp_method, request, using_array_manager):
+        interpolation, method = interp_method
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        df = DataFrame(
+            {
+                "A": [
+                    Timestamp("2011-01-01"),
+                    Timestamp("2011-01-02"),
+                    Timestamp("2011-01-03"),
+                ],
+                "B": [
+                    Timestamp("2011-01-01", tz="US/Eastern"),
+                    Timestamp("2011-01-02", tz="US/Eastern"),
+                    Timestamp("2011-01-03", tz="US/Eastern"),
+                ],
+                "C": [
+                    pd.Timedelta("1 days"),
+                    pd.Timedelta("2 days"),
+                    pd.Timedelta("3 days"),
+                ],
+            }
+        )
+
+        res = df.quantile(
+            0.5, numeric_only=False, interpolation=interpolation, method=method
+        )
+
+        exp = Series(
+            [
+                Timestamp("2011-01-02"),
+                Timestamp("2011-01-02", tz="US/Eastern"),
+                pd.Timedelta("2 days"),
+            ],
+            name=0.5,
+            index=["A", "B", "C"],
+        )
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile(
+            [0.5], numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = DataFrame(
+            [
+                [
+                    Timestamp("2011-01-02"),
+                    Timestamp("2011-01-02", tz="US/Eastern"),
+                    pd.Timedelta("2 days"),
+                ]
+            ],
+            index=[0.5],
+            columns=["A", "B", "C"],
+        )
+        tm.assert_frame_equal(res, exp)
+
+    def test_quantile_box_nat(self):
+        # DatetimeLikeBlock may be consolidated and contain NaT in different loc
+        df = DataFrame(
+            {
+                "A": [
+                    Timestamp("2011-01-01"),
+                    pd.NaT,
+                    Timestamp("2011-01-02"),
+                    Timestamp("2011-01-03"),
+                ],
+                "a": [
+                    Timestamp("2011-01-01"),
+                    Timestamp("2011-01-02"),
+                    pd.NaT,
+                    Timestamp("2011-01-03"),
+                ],
+                "B": [
+                    Timestamp("2011-01-01", tz="US/Eastern"),
+                    pd.NaT,
+                    Timestamp("2011-01-02", tz="US/Eastern"),
+                    Timestamp("2011-01-03", tz="US/Eastern"),
+                ],
+                "b": [
+                    Timestamp("2011-01-01", tz="US/Eastern"),
+                    Timestamp("2011-01-02", tz="US/Eastern"),
+                    pd.NaT,
+                    Timestamp("2011-01-03", tz="US/Eastern"),
+                ],
+                "C": [
+                    pd.Timedelta("1 days"),
+                    pd.Timedelta("2 days"),
+                    pd.Timedelta("3 days"),
+                    pd.NaT,
+                ],
+                "c": [
+                    pd.NaT,
+                    pd.Timedelta("1 days"),
+                    pd.Timedelta("2 days"),
+                    pd.Timedelta("3 days"),
+                ],
+            },
+            columns=list("AaBbCc"),
+        )
+
+        res = df.quantile(0.5, numeric_only=False)
+        exp = Series(
+            [
+                Timestamp("2011-01-02"),
+                Timestamp("2011-01-02"),
+                Timestamp("2011-01-02", tz="US/Eastern"),
+                Timestamp("2011-01-02", tz="US/Eastern"),
+                pd.Timedelta("2 days"),
+                pd.Timedelta("2 days"),
+            ],
+            name=0.5,
+            index=list("AaBbCc"),
+        )
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile([0.5], numeric_only=False)
+        exp = DataFrame(
+            [
+                [
+                    Timestamp("2011-01-02"),
+                    Timestamp("2011-01-02"),
+                    Timestamp("2011-01-02", tz="US/Eastern"),
+                    Timestamp("2011-01-02", tz="US/Eastern"),
+                    pd.Timedelta("2 days"),
+                    pd.Timedelta("2 days"),
+                ]
+            ],
+            index=[0.5],
+            columns=list("AaBbCc"),
+        )
+        tm.assert_frame_equal(res, exp)
+
+    def test_quantile_nan(self, interp_method, request, using_array_manager):
+        interpolation, method = interp_method
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        # GH 14357 - float block where some cols have missing values
+        df = DataFrame({"a": np.arange(1, 6.0), "b": np.arange(1, 6.0)})
+        df.iloc[-1, 1] = np.nan
+
+        res = df.quantile(0.5, interpolation=interpolation, method=method)
+        exp = Series(
+            [3.0, 2.5 if interpolation == "linear" else 3.0], index=["a", "b"], name=0.5
+        )
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile([0.5, 0.75], interpolation=interpolation, method=method)
+        exp = DataFrame(
+            {
+                "a": [3.0, 4.0],
+                "b": [2.5, 3.25] if interpolation == "linear" else [3.0, 4.0],
+            },
+            index=[0.5, 0.75],
+        )
+        tm.assert_frame_equal(res, exp)
+
+        res = df.quantile(0.5, axis=1, interpolation=interpolation, method=method)
+        exp = Series(np.arange(1.0, 6.0), name=0.5)
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile(
+            [0.5, 0.75], axis=1, interpolation=interpolation, method=method
+        )
+        exp = DataFrame([np.arange(1.0, 6.0)] * 2, index=[0.5, 0.75])
+        if interpolation == "nearest":
+            exp.iloc[1, -1] = np.nan
+        tm.assert_frame_equal(res, exp)
+
+        # full-nan column
+        df["b"] = np.nan
+
+        res = df.quantile(0.5, interpolation=interpolation, method=method)
+        exp = Series([3.0, np.nan], index=["a", "b"], name=0.5)
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile([0.5, 0.75], interpolation=interpolation, method=method)
+        exp = DataFrame({"a": [3.0, 4.0], "b": [np.nan, np.nan]}, index=[0.5, 0.75])
+        tm.assert_frame_equal(res, exp)
+
+    def test_quantile_nat(self, interp_method, request, using_array_manager, unit):
+        interpolation, method = interp_method
+        if method == "table" and using_array_manager:
+            request.applymarker(pytest.mark.xfail(reason="Axis name incorrectly set."))
+        # full NaT column
+        df = DataFrame({"a": [pd.NaT, pd.NaT, pd.NaT]}, dtype=f"M8[{unit}]")
+
+        res = df.quantile(
+            0.5, numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = Series([pd.NaT], index=["a"], name=0.5, dtype=f"M8[{unit}]")
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile(
+            [0.5], numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = DataFrame({"a": [pd.NaT]}, index=[0.5], dtype=f"M8[{unit}]")
+        tm.assert_frame_equal(res, exp)
+
+        # mixed non-null / full null column
+        df = DataFrame(
+            {
+                "a": [
+                    Timestamp("2012-01-01"),
+                    Timestamp("2012-01-02"),
+                    Timestamp("2012-01-03"),
+                ],
+                "b": [pd.NaT, pd.NaT, pd.NaT],
+            },
+            dtype=f"M8[{unit}]",
+        )
+
+        res = df.quantile(
+            0.5, numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = Series(
+            [Timestamp("2012-01-02"), pd.NaT],
+            index=["a", "b"],
+            name=0.5,
+            dtype=f"M8[{unit}]",
+        )
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile(
+            [0.5], numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = DataFrame(
+            [[Timestamp("2012-01-02"), pd.NaT]],
+            index=[0.5],
+            columns=["a", "b"],
+            dtype=f"M8[{unit}]",
+        )
+        tm.assert_frame_equal(res, exp)
+
+    def test_quantile_empty_no_rows_floats(self, interp_method):
+        interpolation, method = interp_method
+
+        df = DataFrame(columns=["a", "b"], dtype="float64")
+
+        res = df.quantile(0.5, interpolation=interpolation, method=method)
+        exp = Series([np.nan, np.nan], index=["a", "b"], name=0.5)
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile([0.5], interpolation=interpolation, method=method)
+        exp = DataFrame([[np.nan, np.nan]], columns=["a", "b"], index=[0.5])
+        tm.assert_frame_equal(res, exp)
+
+        res = df.quantile(0.5, axis=1, interpolation=interpolation, method=method)
+        exp = Series([], index=[], dtype="float64", name=0.5)
+        tm.assert_series_equal(res, exp)
+
+        res = df.quantile([0.5], axis=1, interpolation=interpolation, method=method)
+        exp = DataFrame(columns=[], index=[0.5])
+        tm.assert_frame_equal(res, exp)
+
+    def test_quantile_empty_no_rows_ints(self, interp_method):
+        interpolation, method = interp_method
+        df = DataFrame(columns=["a", "b"], dtype="int64")
+
+        res = df.quantile(0.5, interpolation=interpolation, method=method)
+        exp = Series([np.nan, np.nan], index=["a", "b"], name=0.5)
+        tm.assert_series_equal(res, exp)
+
+    def test_quantile_empty_no_rows_dt64(self, interp_method):
+        interpolation, method = interp_method
+        # datetimes
+        df = DataFrame(columns=["a", "b"], dtype="datetime64[ns]")
+
+        res = df.quantile(
+            0.5, numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = Series(
+            [pd.NaT, pd.NaT], index=["a", "b"], dtype="datetime64[ns]", name=0.5
+        )
+        tm.assert_series_equal(res, exp)
+
+        # Mixed dt64/dt64tz
+        df["a"] = df["a"].dt.tz_localize("US/Central")
+        res = df.quantile(
+            0.5, numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = exp.astype(object)
+        if interpolation == "nearest":
+            # GH#18463 TODO: would we prefer NaTs here?
+            msg = "The 'downcast' keyword in fillna is deprecated"
+            with tm.assert_produces_warning(FutureWarning, match=msg):
+                exp = exp.fillna(np.nan, downcast=False)
+        tm.assert_series_equal(res, exp)
+
+        # both dt64tz
+        df["b"] = df["b"].dt.tz_localize("US/Central")
+        res = df.quantile(
+            0.5, numeric_only=False, interpolation=interpolation, method=method
+        )
+        exp = exp.astype(df["b"].dtype)
+        tm.assert_series_equal(res, exp)
+
+    def test_quantile_empty_no_columns(self, interp_method):
+        # GH#23925 _get_numeric_data may drop all columns
+        interpolation, method = interp_method
+        df = DataFrame(pd.date_range("1/1/18", periods=5))
+        df.columns.name = "captain tightpants"
+        result = df.quantile(
+            0.5, numeric_only=True, interpolation=interpolation, method=method
+        )
+        expected = Series([], index=[], name=0.5, dtype=np.float64)
+        expected.index.name = "captain tightpants"
+        tm.assert_series_equal(result, expected)
+
+        result = df.quantile(
+            [0.5], numeric_only=True, interpolation=interpolation, method=method
+        )
+        expected = DataFrame([], index=[0.5], columns=[])
+        expected.columns.name = "captain tightpants"
+        tm.assert_frame_equal(result, expected)
+
+    def test_quantile_item_cache(
+        self, using_array_manager, interp_method, using_copy_on_write
+    ):
+        # previous behavior incorrect retained an invalid _item_cache entry
+        interpolation, method = interp_method
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((4, 3)), columns=["A", "B", "C"]
+        )
+        df["D"] = df["A"] * 2
+        ser = df["A"]
+        if not using_array_manager:
+            assert len(df._mgr.blocks) == 2
+
+        df.quantile(numeric_only=False, interpolation=interpolation, method=method)
+
+        if using_copy_on_write:
+            ser.iloc[0] = 99
+            assert df.iloc[0, 0] == df["A"][0]
+            assert df.iloc[0, 0] != 99
+        else:
+            ser.values[0] = 99
+            assert df.iloc[0, 0] == df["A"][0]
+            assert df.iloc[0, 0] == 99
+
+    def test_invalid_method(self):
+        with pytest.raises(ValueError, match="Invalid method: foo"):
+            DataFrame(range(1)).quantile(0.5, method="foo")
+
+    def test_table_invalid_interpolation(self):
+        with pytest.raises(ValueError, match="Invalid interpolation: foo"):
+            DataFrame(range(1)).quantile(0.5, method="table", interpolation="foo")
+
+
+class TestQuantileExtensionDtype:
+    # TODO: tests for axis=1?
+    # TODO: empty case?
+
+    @pytest.fixture(
+        params=[
+            pytest.param(
+                pd.IntervalIndex.from_breaks(range(10)),
+                marks=pytest.mark.xfail(reason="raises when trying to add Intervals"),
+            ),
+            pd.period_range("2016-01-01", periods=9, freq="D"),
+            pd.date_range("2016-01-01", periods=9, tz="US/Pacific"),
+            pd.timedelta_range("1 Day", periods=9),
+            pd.array(np.arange(9), dtype="Int64"),
+            pd.array(np.arange(9), dtype="Float64"),
+        ],
+        ids=lambda x: str(x.dtype),
+    )
+    def index(self, request):
+        # NB: not actually an Index object
+        idx = request.param
+        idx.name = "A"
+        return idx
+
+    @pytest.fixture
+    def obj(self, index, frame_or_series):
+        # bc index is not always an Index (yet), we need to re-patch .name
+        obj = frame_or_series(index).copy()
+
+        if frame_or_series is Series:
+            obj.name = "A"
+        else:
+            obj.columns = ["A"]
+        return obj
+
+    def compute_quantile(self, obj, qs):
+        if isinstance(obj, Series):
+            result = obj.quantile(qs)
+        else:
+            result = obj.quantile(qs, numeric_only=False)
+        return result
+
+    def test_quantile_ea(self, request, obj, index):
+        # result should be invariant to shuffling
+        indexer = np.arange(len(index), dtype=np.intp)
+        np.random.default_rng(2).shuffle(indexer)
+        obj = obj.iloc[indexer]
+
+        qs = [0.5, 0, 1]
+        result = self.compute_quantile(obj, qs)
+
+        exp_dtype = index.dtype
+        if index.dtype == "Int64":
+            # match non-nullable casting behavior
+            exp_dtype = "Float64"
+
+        # expected here assumes len(index) == 9
+        expected = Series(
+            [index[4], index[0], index[-1]], dtype=exp_dtype, index=qs, name="A"
+        )
+        expected = type(obj)(expected)
+
+        tm.assert_equal(result, expected)
+
+    def test_quantile_ea_with_na(self, obj, index):
+        obj.iloc[0] = index._na_value
+        obj.iloc[-1] = index._na_value
+
+        # result should be invariant to shuffling
+        indexer = np.arange(len(index), dtype=np.intp)
+        np.random.default_rng(2).shuffle(indexer)
+        obj = obj.iloc[indexer]
+
+        qs = [0.5, 0, 1]
+        result = self.compute_quantile(obj, qs)
+
+        # expected here assumes len(index) == 9
+        expected = Series(
+            [index[4], index[1], index[-2]], dtype=index.dtype, index=qs, name="A"
+        )
+        expected = type(obj)(expected)
+        tm.assert_equal(result, expected)
+
+    def test_quantile_ea_all_na(self, request, obj, index):
+        obj.iloc[:] = index._na_value
+        # Check dtypes were preserved; this was once a problem see GH#39763
+        assert np.all(obj.dtypes == index.dtype)
+
+        # result should be invariant to shuffling
+        indexer = np.arange(len(index), dtype=np.intp)
+        np.random.default_rng(2).shuffle(indexer)
+        obj = obj.iloc[indexer]
+
+        qs = [0.5, 0, 1]
+        result = self.compute_quantile(obj, qs)
+
+        expected = index.take([-1, -1, -1], allow_fill=True, fill_value=index._na_value)
+        expected = Series(expected, index=qs, name="A")
+        expected = type(obj)(expected)
+        tm.assert_equal(result, expected)
+
+    def test_quantile_ea_scalar(self, request, obj, index):
+        # scalar qs
+
+        # result should be invariant to shuffling
+        indexer = np.arange(len(index), dtype=np.intp)
+        np.random.default_rng(2).shuffle(indexer)
+        obj = obj.iloc[indexer]
+
+        qs = 0.5
+        result = self.compute_quantile(obj, qs)
+
+        exp_dtype = index.dtype
+        if index.dtype == "Int64":
+            exp_dtype = "Float64"
+
+        expected = Series({"A": index[4]}, dtype=exp_dtype, name=0.5)
+        if isinstance(obj, Series):
+            expected = expected["A"]
+            assert result == expected
+        else:
+            tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "dtype, expected_data, expected_index, axis",
+        [
+            ["float64", [], [], 1],
+            ["int64", [], [], 1],
+            ["float64", [np.nan, np.nan], ["a", "b"], 0],
+            ["int64", [np.nan, np.nan], ["a", "b"], 0],
+        ],
+    )
+    def test_empty_numeric(self, dtype, expected_data, expected_index, axis):
+        # GH 14564
+        df = DataFrame(columns=["a", "b"], dtype=dtype)
+        result = df.quantile(0.5, axis=axis)
+        expected = Series(
+            expected_data, name=0.5, index=Index(expected_index), dtype="float64"
+        )
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "dtype, expected_data, expected_index, axis, expected_dtype",
+        [
+            ["datetime64[ns]", [], [], 1, "datetime64[ns]"],
+            ["datetime64[ns]", [pd.NaT, pd.NaT], ["a", "b"], 0, "datetime64[ns]"],
+        ],
+    )
+    def test_empty_datelike(
+        self, dtype, expected_data, expected_index, axis, expected_dtype
+    ):
+        # GH 14564
+        df = DataFrame(columns=["a", "b"], dtype=dtype)
+        result = df.quantile(0.5, axis=axis, numeric_only=False)
+        expected = Series(
+            expected_data, name=0.5, index=Index(expected_index), dtype=expected_dtype
+        )
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "expected_data, expected_index, axis",
+        [
+            [[np.nan, np.nan], range(2), 1],
+            [[], [], 0],
+        ],
+    )
+    def test_datelike_numeric_only(self, expected_data, expected_index, axis):
+        # GH 14564
+        df = DataFrame(
+            {
+                "a": pd.to_datetime(["2010", "2011"]),
+                "b": [0, 5],
+                "c": pd.to_datetime(["2011", "2012"]),
+            }
+        )
+        result = df[["a", "c"]].quantile(0.5, axis=axis, numeric_only=True)
+        expected = Series(
+            expected_data, name=0.5, index=Index(expected_index), dtype=np.float64
+        )
+        tm.assert_series_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_to_records.py

@@ -0,0 +1,523 @@
+from collections import abc
+import email
+from email.parser import Parser
+
+import numpy as np
+import pytest
+
+from pandas import (
+    CategoricalDtype,
+    DataFrame,
+    MultiIndex,
+    Series,
+    Timestamp,
+    date_range,
+)
+import pandas._testing as tm
+
+
+class TestDataFrameToRecords:
+    def test_to_records_timeseries(self):
+        index = date_range("1/1/2000", periods=10)
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((10, 3)),
+            index=index,
+            columns=["a", "b", "c"],
+        )
+
+        result = df.to_records()
+        assert result["index"].dtype == "M8[ns]"
+
+        result = df.to_records(index=False)
+
+    def test_to_records_dt64(self):
+        df = DataFrame(
+            [["one", "two", "three"], ["four", "five", "six"]],
+            index=date_range("2012-01-01", "2012-01-02"),
+        )
+
+        expected = df.index.values[0]
+        result = df.to_records()["index"][0]
+        assert expected == result
+
+    def test_to_records_dt64tz_column(self):
+        # GH#32535 dont less tz in to_records
+        df = DataFrame({"A": date_range("2012-01-01", "2012-01-02", tz="US/Eastern")})
+
+        result = df.to_records()
+
+        assert result.dtype["A"] == object
+        val = result[0][1]
+        assert isinstance(val, Timestamp)
+        assert val == df.loc[0, "A"]
+
+    def test_to_records_with_multindex(self):
+        # GH#3189
+        index = [
+            ["bar", "bar", "baz", "baz", "foo", "foo", "qux", "qux"],
+            ["one", "two", "one", "two", "one", "two", "one", "two"],
+        ]
+        data = np.zeros((8, 4))
+        df = DataFrame(data, index=index)
+        r = df.to_records(index=True)["level_0"]
+        assert "bar" in r
+        assert "one" not in r
+
+    def test_to_records_with_Mapping_type(self):
+        abc.Mapping.register(email.message.Message)
+
+        headers = Parser().parsestr(
+            "From: <[email protected]>\n"
+            "To: <[email protected]>\n"
+            "Subject: Test message\n"
+            "\n"
+            "Body would go here\n"
+        )
+
+        frame = DataFrame.from_records([headers])
+        all(x in frame for x in ["Type", "Subject", "From"])
+
+    def test_to_records_floats(self):
+        df = DataFrame(np.random.default_rng(2).random((10, 10)))
+        df.to_records()
+
+    def test_to_records_index_name(self):
+        df = DataFrame(np.random.default_rng(2).standard_normal((3, 3)))
+        df.index.name = "X"
+        rs = df.to_records()
+        assert "X" in rs.dtype.fields
+
+        df = DataFrame(np.random.default_rng(2).standard_normal((3, 3)))
+        rs = df.to_records()
+        assert "index" in rs.dtype.fields
+
+        df.index = MultiIndex.from_tuples([("a", "x"), ("a", "y"), ("b", "z")])
+        df.index.names = ["A", None]
+        result = df.to_records()
+        expected = np.rec.fromarrays(
+            [np.array(["a", "a", "b"]), np.array(["x", "y", "z"])]
+            + [np.asarray(df.iloc[:, i]) for i in range(3)],
+            dtype={
+                "names": ["A", "level_1", "0", "1", "2"],
+                "formats": [
+                    "O",
+                    "O",
+                    f"{tm.ENDIAN}f8",
+                    f"{tm.ENDIAN}f8",
+                    f"{tm.ENDIAN}f8",
+                ],
+            },
+        )
+        tm.assert_numpy_array_equal(result, expected)
+
+    def test_to_records_with_unicode_index(self):
+        # GH#13172
+        # unicode_literals conflict with to_records
+        result = DataFrame([{"a": "x", "b": "y"}]).set_index("a").to_records()
+        expected = np.rec.array([("x", "y")], dtype=[("a", "O"), ("b", "O")])
+        tm.assert_almost_equal(result, expected)
+
+    def test_to_records_index_dtype(self):
+        # GH 47263: consistent data types for Index and MultiIndex
+        df = DataFrame(
+            {
+                1: date_range("2022-01-01", periods=2),
+                2: date_range("2022-01-01", periods=2),
+                3: date_range("2022-01-01", periods=2),
+            }
+        )
+
+        expected = np.rec.array(
+            [
+                ("2022-01-01", "2022-01-01", "2022-01-01"),
+                ("2022-01-02", "2022-01-02", "2022-01-02"),
+            ],
+            dtype=[
+                ("1", f"{tm.ENDIAN}M8[ns]"),
+                ("2", f"{tm.ENDIAN}M8[ns]"),
+                ("3", f"{tm.ENDIAN}M8[ns]"),
+            ],
+        )
+
+        result = df.to_records(index=False)
+        tm.assert_almost_equal(result, expected)
+
+        result = df.set_index(1).to_records(index=True)
+        tm.assert_almost_equal(result, expected)
+
+        result = df.set_index([1, 2]).to_records(index=True)
+        tm.assert_almost_equal(result, expected)
+
+    def test_to_records_with_unicode_column_names(self):
+        # xref issue: https://github.com/numpy/numpy/issues/2407
+        # Issue GH#11879. to_records used to raise an exception when used
+        # with column names containing non-ascii characters in Python 2
+        result = DataFrame(data={"accented_name_é": [1.0]}).to_records()
+
+        # Note that numpy allows for unicode field names but dtypes need
+        # to be specified using dictionary instead of list of tuples.
+        expected = np.rec.array(
+            [(0, 1.0)],
+            dtype={"names": ["index", "accented_name_é"], "formats": ["=i8", "=f8"]},
+        )
+        tm.assert_almost_equal(result, expected)
+
+    def test_to_records_with_categorical(self):
+        # GH#8626
+
+        # dict creation
+        df = DataFrame({"A": list("abc")}, dtype="category")
+        expected = Series(list("abc"), dtype="category", name="A")
+        tm.assert_series_equal(df["A"], expected)
+
+        # list-like creation
+        df = DataFrame(list("abc"), dtype="category")
+        expected = Series(list("abc"), dtype="category", name=0)
+        tm.assert_series_equal(df[0], expected)
+
+        # to record array
+        # this coerces
+        result = df.to_records()
+        expected = np.rec.array(
+            [(0, "a"), (1, "b"), (2, "c")], dtype=[("index", "=i8"), ("0", "O")]
+        )
+        tm.assert_almost_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "kwargs,expected",
+        [
+            # No dtypes --> default to array dtypes.
+            (
+                {},
+                np.rec.array(
+                    [(0, 1, 0.2, "a"), (1, 2, 1.5, "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", f"{tm.ENDIAN}i8"),
+                        ("B", f"{tm.ENDIAN}f8"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Should have no effect in this case.
+            (
+                {"index": True},
+                np.rec.array(
+                    [(0, 1, 0.2, "a"), (1, 2, 1.5, "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", f"{tm.ENDIAN}i8"),
+                        ("B", f"{tm.ENDIAN}f8"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Column dtype applied across the board. Index unaffected.
+            (
+                {"column_dtypes": f"{tm.ENDIAN}U4"},
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", f"{tm.ENDIAN}U4"),
+                        ("B", f"{tm.ENDIAN}U4"),
+                        ("C", f"{tm.ENDIAN}U4"),
+                    ],
+                ),
+            ),
+            # Index dtype applied across the board. Columns unaffected.
+            (
+                {"index_dtypes": f"{tm.ENDIAN}U1"},
+                np.rec.array(
+                    [("0", 1, 0.2, "a"), ("1", 2, 1.5, "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}U1"),
+                        ("A", f"{tm.ENDIAN}i8"),
+                        ("B", f"{tm.ENDIAN}f8"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Pass in a type instance.
+            (
+                {"column_dtypes": str},
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", f"{tm.ENDIAN}U"),
+                        ("B", f"{tm.ENDIAN}U"),
+                        ("C", f"{tm.ENDIAN}U"),
+                    ],
+                ),
+            ),
+            # Pass in a dtype instance.
+            (
+                {"column_dtypes": np.dtype(np.str_)},
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", f"{tm.ENDIAN}U"),
+                        ("B", f"{tm.ENDIAN}U"),
+                        ("C", f"{tm.ENDIAN}U"),
+                    ],
+                ),
+            ),
+            # Pass in a dictionary (name-only).
+            (
+                {
+                    "column_dtypes": {
+                        "A": np.int8,
+                        "B": np.float32,
+                        "C": f"{tm.ENDIAN}U2",
+                    }
+                },
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", "i1"),
+                        ("B", f"{tm.ENDIAN}f4"),
+                        ("C", f"{tm.ENDIAN}U2"),
+                    ],
+                ),
+            ),
+            # Pass in a dictionary (indices-only).
+            (
+                {"index_dtypes": {0: "int16"}},
+                np.rec.array(
+                    [(0, 1, 0.2, "a"), (1, 2, 1.5, "bc")],
+                    dtype=[
+                        ("index", "i2"),
+                        ("A", f"{tm.ENDIAN}i8"),
+                        ("B", f"{tm.ENDIAN}f8"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Ignore index mappings if index is not True.
+            (
+                {"index": False, "index_dtypes": f"{tm.ENDIAN}U2"},
+                np.rec.array(
+                    [(1, 0.2, "a"), (2, 1.5, "bc")],
+                    dtype=[
+                        ("A", f"{tm.ENDIAN}i8"),
+                        ("B", f"{tm.ENDIAN}f8"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Non-existent names / indices in mapping should not error.
+            (
+                {"index_dtypes": {0: "int16", "not-there": "float32"}},
+                np.rec.array(
+                    [(0, 1, 0.2, "a"), (1, 2, 1.5, "bc")],
+                    dtype=[
+                        ("index", "i2"),
+                        ("A", f"{tm.ENDIAN}i8"),
+                        ("B", f"{tm.ENDIAN}f8"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Names / indices not in mapping default to array dtype.
+            (
+                {"column_dtypes": {"A": np.int8, "B": np.float32}},
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", "i1"),
+                        ("B", f"{tm.ENDIAN}f4"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Names / indices not in dtype mapping default to array dtype.
+            (
+                {"column_dtypes": {"A": np.dtype("int8"), "B": np.dtype("float32")}},
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}i8"),
+                        ("A", "i1"),
+                        ("B", f"{tm.ENDIAN}f4"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Mixture of everything.
+            (
+                {
+                    "column_dtypes": {"A": np.int8, "B": np.float32},
+                    "index_dtypes": f"{tm.ENDIAN}U2",
+                },
+                np.rec.array(
+                    [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}U2"),
+                        ("A", "i1"),
+                        ("B", f"{tm.ENDIAN}f4"),
+                        ("C", "O"),
+                    ],
+                ),
+            ),
+            # Invalid dype values.
+            (
+                {"index": False, "column_dtypes": []},
+                (ValueError, "Invalid dtype \\[\\] specified for column A"),
+            ),
+            (
+                {"index": False, "column_dtypes": {"A": "int32", "B": 5}},
+                (ValueError, "Invalid dtype 5 specified for column B"),
+            ),
+            # Numpy can't handle EA types, so check error is raised
+            (
+                {
+                    "index": False,
+                    "column_dtypes": {"A": "int32", "B": CategoricalDtype(["a", "b"])},
+                },
+                (ValueError, "Invalid dtype category specified for column B"),
+            ),
+            # Check that bad types raise
+            (
+                {"index": False, "column_dtypes": {"A": "int32", "B": "foo"}},
+                (TypeError, "data type [\"']foo[\"'] not understood"),
+            ),
+        ],
+    )
+    def test_to_records_dtype(self, kwargs, expected):
+        # see GH#18146
+        df = DataFrame({"A": [1, 2], "B": [0.2, 1.5], "C": ["a", "bc"]})
+
+        if not isinstance(expected, np.rec.recarray):
+            with pytest.raises(expected[0], match=expected[1]):
+                df.to_records(**kwargs)
+        else:
+            result = df.to_records(**kwargs)
+            tm.assert_almost_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "df,kwargs,expected",
+        [
+            # MultiIndex in the index.
+            (
+                DataFrame(
+                    [[1, 2, 3], [4, 5, 6], [7, 8, 9]], columns=list("abc")
+                ).set_index(["a", "b"]),
+                {"column_dtypes": "float64", "index_dtypes": {0: "int32", 1: "int8"}},
+                np.rec.array(
+                    [(1, 2, 3.0), (4, 5, 6.0), (7, 8, 9.0)],
+                    dtype=[
+                        ("a", f"{tm.ENDIAN}i4"),
+                        ("b", "i1"),
+                        ("c", f"{tm.ENDIAN}f8"),
+                    ],
+                ),
+            ),
+            # MultiIndex in the columns.
+            (
+                DataFrame(
+                    [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
+                    columns=MultiIndex.from_tuples(
+                        [("a", "d"), ("b", "e"), ("c", "f")]
+                    ),
+                ),
+                {
+                    "column_dtypes": {0: f"{tm.ENDIAN}U1", 2: "float32"},
+                    "index_dtypes": "float32",
+                },
+                np.rec.array(
+                    [(0.0, "1", 2, 3.0), (1.0, "4", 5, 6.0), (2.0, "7", 8, 9.0)],
+                    dtype=[
+                        ("index", f"{tm.ENDIAN}f4"),
+                        ("('a', 'd')", f"{tm.ENDIAN}U1"),
+                        ("('b', 'e')", f"{tm.ENDIAN}i8"),
+                        ("('c', 'f')", f"{tm.ENDIAN}f4"),
+                    ],
+                ),
+            ),
+            # MultiIndex in both the columns and index.
+            (
+                DataFrame(
+                    [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
+                    columns=MultiIndex.from_tuples(
+                        [("a", "d"), ("b", "e"), ("c", "f")], names=list("ab")
+                    ),
+                    index=MultiIndex.from_tuples(
+                        [("d", -4), ("d", -5), ("f", -6)], names=list("cd")
+                    ),
+                ),
+                {
+                    "column_dtypes": "float64",
+                    "index_dtypes": {0: f"{tm.ENDIAN}U2", 1: "int8"},
+                },
+                np.rec.array(
+                    [
+                        ("d", -4, 1.0, 2.0, 3.0),
+                        ("d", -5, 4.0, 5.0, 6.0),
+                        ("f", -6, 7, 8, 9.0),
+                    ],
+                    dtype=[
+                        ("c", f"{tm.ENDIAN}U2"),
+                        ("d", "i1"),
+                        ("('a', 'd')", f"{tm.ENDIAN}f8"),
+                        ("('b', 'e')", f"{tm.ENDIAN}f8"),
+                        ("('c', 'f')", f"{tm.ENDIAN}f8"),
+                    ],
+                ),
+            ),
+        ],
+    )
+    def test_to_records_dtype_mi(self, df, kwargs, expected):
+        # see GH#18146
+        result = df.to_records(**kwargs)
+        tm.assert_almost_equal(result, expected)
+
+    def test_to_records_dict_like(self):
+        # see GH#18146
+        class DictLike:
+            def __init__(self, **kwargs) -> None:
+                self.d = kwargs.copy()
+
+            def __getitem__(self, key):
+                return self.d.__getitem__(key)
+
+            def __contains__(self, key) -> bool:
+                return key in self.d
+
+            def keys(self):
+                return self.d.keys()
+
+        df = DataFrame({"A": [1, 2], "B": [0.2, 1.5], "C": ["a", "bc"]})
+
+        dtype_mappings = {
+            "column_dtypes": DictLike(A=np.int8, B=np.float32),
+            "index_dtypes": f"{tm.ENDIAN}U2",
+        }
+
+        result = df.to_records(**dtype_mappings)
+        expected = np.rec.array(
+            [("0", "1", "0.2", "a"), ("1", "2", "1.5", "bc")],
+            dtype=[
+                ("index", f"{tm.ENDIAN}U2"),
+                ("A", "i1"),
+                ("B", f"{tm.ENDIAN}f4"),
+                ("C", "O"),
+            ],
+        )
+        tm.assert_almost_equal(result, expected)
+
+    @pytest.mark.parametrize("tz", ["UTC", "GMT", "US/Eastern"])
+    def test_to_records_datetimeindex_with_tz(self, tz):
+        # GH#13937
+        dr = date_range("2016-01-01", periods=10, freq="s", tz=tz)
+
+        df = DataFrame({"datetime": dr}, index=dr)
+
+        expected = df.to_records()
+        result = df.tz_convert("UTC").to_records()
+
+        # both converted to UTC, so they are equal
+        tm.assert_numpy_array_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/methods/test_tz_localize.py

@@ -0,0 +1,68 @@
+from datetime import timezone
+
+import numpy as np
+import pytest
+
+from pandas import (
+    DataFrame,
+    Series,
+    date_range,
+)
+import pandas._testing as tm
+
+
+class TestTZLocalize:
+    # See also:
+    # test_tz_convert_and_localize in test_tz_convert
+
+    def test_tz_localize(self, frame_or_series):
+        rng = date_range("1/1/2011", periods=100, freq="h")
+
+        obj = DataFrame({"a": 1}, index=rng)
+        obj = tm.get_obj(obj, frame_or_series)
+
+        result = obj.tz_localize("utc")
+        expected = DataFrame({"a": 1}, rng.tz_localize("UTC"))
+        expected = tm.get_obj(expected, frame_or_series)
+
+        assert result.index.tz is timezone.utc
+        tm.assert_equal(result, expected)
+
+    def test_tz_localize_axis1(self):
+        rng = date_range("1/1/2011", periods=100, freq="h")
+
+        df = DataFrame({"a": 1}, index=rng)
+
+        df = df.T
+        result = df.tz_localize("utc", axis=1)
+        assert result.columns.tz is timezone.utc
+
+        expected = DataFrame({"a": 1}, rng.tz_localize("UTC"))
+
+        tm.assert_frame_equal(result, expected.T)
+
+    def test_tz_localize_naive(self, frame_or_series):
+        # Can't localize if already tz-aware
+        rng = date_range("1/1/2011", periods=100, freq="h", tz="utc")
+        ts = Series(1, index=rng)
+        ts = frame_or_series(ts)
+
+        with pytest.raises(TypeError, match="Already tz-aware"):
+            ts.tz_localize("US/Eastern")
+
+    @pytest.mark.parametrize("copy", [True, False])
+    def test_tz_localize_copy_inplace_mutate(self, copy, frame_or_series):
+        # GH#6326
+        obj = frame_or_series(
+            np.arange(0, 5), index=date_range("20131027", periods=5, freq="1h", tz=None)
+        )
+        orig = obj.copy()
+        result = obj.tz_localize("UTC", copy=copy)
+        expected = frame_or_series(
+            np.arange(0, 5),
+            index=date_range("20131027", periods=5, freq="1h", tz="UTC"),
+        )
+        tm.assert_equal(result, expected)
+        tm.assert_equal(obj, orig)
+        assert result.index is not obj.index
+        assert result is not obj

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_alter_axes.py

@@ -0,0 +1,30 @@
+from datetime import datetime
+
+import pytz
+
+from pandas import DataFrame
+import pandas._testing as tm
+
+
+class TestDataFrameAlterAxes:
+    # Tests for setting index/columns attributes directly (i.e. __setattr__)
+
+    def test_set_axis_setattr_index(self):
+        # GH 6785
+        # set the index manually
+
+        df = DataFrame([{"ts": datetime(2014, 4, 1, tzinfo=pytz.utc), "foo": 1}])
+        expected = df.set_index("ts")
+        df.index = df["ts"]
+        df.pop("ts")
+        tm.assert_frame_equal(df, expected)
+
+    # Renaming
+
+    def test_assign_columns(self, float_frame):
+        float_frame["hi"] = "there"
+
+        df = float_frame.copy()
+        df.columns = ["foo", "bar", "baz", "quux", "foo2"]
+        tm.assert_series_equal(float_frame["C"], df["baz"], check_names=False)
+        tm.assert_series_equal(float_frame["hi"], df["foo2"], check_names=False)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_arithmetic.py

@@ -0,0 +1,2136 @@
+from collections import deque
+from datetime import (
+    datetime,
+    timezone,
+)
+from enum import Enum
+import functools
+import operator
+import re
+
+import numpy as np
+import pytest
+
+from pandas._config import using_pyarrow_string_dtype
+
+import pandas.util._test_decorators as td
+
+import pandas as pd
+from pandas import (
+    DataFrame,
+    Index,
+    MultiIndex,
+    Series,
+)
+import pandas._testing as tm
+from pandas.core.computation import expressions as expr
+from pandas.tests.frame.common import (
+    _check_mixed_float,
+    _check_mixed_int,
+)
+
+
+@pytest.fixture
+def simple_frame():
+    """
+    Fixture for simple 3x3 DataFrame
+
+    Columns are ['one', 'two', 'three'], index is ['a', 'b', 'c'].
+
+       one  two  three
+    a  1.0  2.0    3.0
+    b  4.0  5.0    6.0
+    c  7.0  8.0    9.0
+    """
+    arr = np.array([[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]])
+
+    return DataFrame(arr, columns=["one", "two", "three"], index=["a", "b", "c"])
+
+
+@pytest.fixture(autouse=True, params=[0, 100], ids=["numexpr", "python"])
+def switch_numexpr_min_elements(request, monkeypatch):
+    with monkeypatch.context() as m:
+        m.setattr(expr, "_MIN_ELEMENTS", request.param)
+        yield request.param
+
+
+class DummyElement:
+    def __init__(self, value, dtype) -> None:
+        self.value = value
+        self.dtype = np.dtype(dtype)
+
+    def __array__(self, dtype=None, copy=None):
+        return np.array(self.value, dtype=self.dtype)
+
+    def __str__(self) -> str:
+        return f"DummyElement({self.value}, {self.dtype})"
+
+    def __repr__(self) -> str:
+        return str(self)
+
+    def astype(self, dtype, copy=False):
+        self.dtype = dtype
+        return self
+
+    def view(self, dtype):
+        return type(self)(self.value.view(dtype), dtype)
+
+    def any(self, axis=None):
+        return bool(self.value)
+
+
+# -------------------------------------------------------------------
+# Comparisons
+
+
+class TestFrameComparisons:
+    # Specifically _not_ flex-comparisons
+
+    def test_comparison_with_categorical_dtype(self):
+        # GH#12564
+
+        df = DataFrame({"A": ["foo", "bar", "baz"]})
+        exp = DataFrame({"A": [True, False, False]})
+
+        res = df == "foo"
+        tm.assert_frame_equal(res, exp)
+
+        # casting to categorical shouldn't affect the result
+        df["A"] = df["A"].astype("category")
+
+        res = df == "foo"
+        tm.assert_frame_equal(res, exp)
+
+    def test_frame_in_list(self):
+        # GH#12689 this should raise at the DataFrame level, not blocks
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((6, 4)), columns=list("ABCD")
+        )
+        msg = "The truth value of a DataFrame is ambiguous"
+        with pytest.raises(ValueError, match=msg):
+            df in [None]
+
+    @pytest.mark.parametrize(
+        "arg, arg2",
+        [
+            [
+                {
+                    "a": np.random.default_rng(2).integers(10, size=10),
+                    "b": pd.date_range("20010101", periods=10),
+                },
+                {
+                    "a": np.random.default_rng(2).integers(10, size=10),
+                    "b": np.random.default_rng(2).integers(10, size=10),
+                },
+            ],
+            [
+                {
+                    "a": np.random.default_rng(2).integers(10, size=10),
+                    "b": np.random.default_rng(2).integers(10, size=10),
+                },
+                {
+                    "a": np.random.default_rng(2).integers(10, size=10),
+                    "b": pd.date_range("20010101", periods=10),
+                },
+            ],
+            [
+                {
+                    "a": pd.date_range("20010101", periods=10),
+                    "b": pd.date_range("20010101", periods=10),
+                },
+                {
+                    "a": np.random.default_rng(2).integers(10, size=10),
+                    "b": np.random.default_rng(2).integers(10, size=10),
+                },
+            ],
+            [
+                {
+                    "a": np.random.default_rng(2).integers(10, size=10),
+                    "b": pd.date_range("20010101", periods=10),
+                },
+                {
+                    "a": pd.date_range("20010101", periods=10),
+                    "b": pd.date_range("20010101", periods=10),
+                },
+            ],
+        ],
+    )
+    def test_comparison_invalid(self, arg, arg2):
+        # GH4968
+        # invalid date/int comparisons
+        x = DataFrame(arg)
+        y = DataFrame(arg2)
+        # we expect the result to match Series comparisons for
+        # == and !=, inequalities should raise
+        result = x == y
+        expected = DataFrame(
+            {col: x[col] == y[col] for col in x.columns},
+            index=x.index,
+            columns=x.columns,
+        )
+        tm.assert_frame_equal(result, expected)
+
+        result = x != y
+        expected = DataFrame(
+            {col: x[col] != y[col] for col in x.columns},
+            index=x.index,
+            columns=x.columns,
+        )
+        tm.assert_frame_equal(result, expected)
+
+        msgs = [
+            r"Invalid comparison between dtype=datetime64\[ns\] and ndarray",
+            "invalid type promotion",
+            (
+                # npdev 1.20.0
+                r"The DTypes <class 'numpy.dtype\[.*\]'> and "
+                r"<class 'numpy.dtype\[.*\]'> do not have a common DType."
+            ),
+        ]
+        msg = "|".join(msgs)
+        with pytest.raises(TypeError, match=msg):
+            x >= y
+        with pytest.raises(TypeError, match=msg):
+            x > y
+        with pytest.raises(TypeError, match=msg):
+            x < y
+        with pytest.raises(TypeError, match=msg):
+            x <= y
+
+    @pytest.mark.parametrize(
+        "left, right",
+        [
+            ("gt", "lt"),
+            ("lt", "gt"),
+            ("ge", "le"),
+            ("le", "ge"),
+            ("eq", "eq"),
+            ("ne", "ne"),
+        ],
+    )
+    def test_timestamp_compare(self, left, right):
+        # make sure we can compare Timestamps on the right AND left hand side
+        # GH#4982
+        df = DataFrame(
+            {
+                "dates1": pd.date_range("20010101", periods=10),
+                "dates2": pd.date_range("20010102", periods=10),
+                "intcol": np.random.default_rng(2).integers(1000000000, size=10),
+                "floatcol": np.random.default_rng(2).standard_normal(10),
+                "stringcol": [chr(100 + i) for i in range(10)],
+            }
+        )
+        df.loc[np.random.default_rng(2).random(len(df)) > 0.5, "dates2"] = pd.NaT
+        left_f = getattr(operator, left)
+        right_f = getattr(operator, right)
+
+        # no nats
+        if left in ["eq", "ne"]:
+            expected = left_f(df, pd.Timestamp("20010109"))
+            result = right_f(pd.Timestamp("20010109"), df)
+            tm.assert_frame_equal(result, expected)
+        else:
+            msg = (
+                "'(<|>)=?' not supported between "
+                "instances of 'numpy.ndarray' and 'Timestamp'"
+            )
+            with pytest.raises(TypeError, match=msg):
+                left_f(df, pd.Timestamp("20010109"))
+            with pytest.raises(TypeError, match=msg):
+                right_f(pd.Timestamp("20010109"), df)
+        # nats
+        if left in ["eq", "ne"]:
+            expected = left_f(df, pd.Timestamp("nat"))
+            result = right_f(pd.Timestamp("nat"), df)
+            tm.assert_frame_equal(result, expected)
+        else:
+            msg = (
+                "'(<|>)=?' not supported between "
+                "instances of 'numpy.ndarray' and 'NaTType'"
+            )
+            with pytest.raises(TypeError, match=msg):
+                left_f(df, pd.Timestamp("nat"))
+            with pytest.raises(TypeError, match=msg):
+                right_f(pd.Timestamp("nat"), df)
+
+    @pytest.mark.xfail(
+        using_pyarrow_string_dtype(), reason="can't compare string and int"
+    )
+    def test_mixed_comparison(self):
+        # GH#13128, GH#22163 != datetime64 vs non-dt64 should be False,
+        # not raise TypeError
+        # (this appears to be fixed before GH#22163, not sure when)
+        df = DataFrame([["1989-08-01", 1], ["1989-08-01", 2]])
+        other = DataFrame([["a", "b"], ["c", "d"]])
+
+        result = df == other
+        assert not result.any().any()
+
+        result = df != other
+        assert result.all().all()
+
+    def test_df_boolean_comparison_error(self):
+        # GH#4576, GH#22880
+        # comparing DataFrame against list/tuple with len(obj) matching
+        #  len(df.columns) is supported as of GH#22800
+        df = DataFrame(np.arange(6).reshape((3, 2)))
+
+        expected = DataFrame([[False, False], [True, False], [False, False]])
+
+        result = df == (2, 2)
+        tm.assert_frame_equal(result, expected)
+
+        result = df == [2, 2]
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_float_none_comparison(self):
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((8, 3)),
+            index=range(8),
+            columns=["A", "B", "C"],
+        )
+
+        result = df.__eq__(None)
+        assert not result.any().any()
+
+    def test_df_string_comparison(self):
+        df = DataFrame([{"a": 1, "b": "foo"}, {"a": 2, "b": "bar"}])
+        mask_a = df.a > 1
+        tm.assert_frame_equal(df[mask_a], df.loc[1:1, :])
+        tm.assert_frame_equal(df[-mask_a], df.loc[0:0, :])
+
+        mask_b = df.b == "foo"
+        tm.assert_frame_equal(df[mask_b], df.loc[0:0, :])
+        tm.assert_frame_equal(df[-mask_b], df.loc[1:1, :])
+
+
+class TestFrameFlexComparisons:
+    # TODO: test_bool_flex_frame needs a better name
+    @pytest.mark.parametrize("op", ["eq", "ne", "gt", "lt", "ge", "le"])
+    def test_bool_flex_frame(self, op):
+        data = np.random.default_rng(2).standard_normal((5, 3))
+        other_data = np.random.default_rng(2).standard_normal((5, 3))
+        df = DataFrame(data)
+        other = DataFrame(other_data)
+        ndim_5 = np.ones(df.shape + (1, 3))
+
+        # DataFrame
+        assert df.eq(df).values.all()
+        assert not df.ne(df).values.any()
+        f = getattr(df, op)
+        o = getattr(operator, op)
+        # No NAs
+        tm.assert_frame_equal(f(other), o(df, other))
+        # Unaligned
+        part_o = other.loc[3:, 1:].copy()
+        rs = f(part_o)
+        xp = o(df, part_o.reindex(index=df.index, columns=df.columns))
+        tm.assert_frame_equal(rs, xp)
+        # ndarray
+        tm.assert_frame_equal(f(other.values), o(df, other.values))
+        # scalar
+        tm.assert_frame_equal(f(0), o(df, 0))
+        # NAs
+        msg = "Unable to coerce to Series/DataFrame"
+        tm.assert_frame_equal(f(np.nan), o(df, np.nan))
+        with pytest.raises(ValueError, match=msg):
+            f(ndim_5)
+
+    @pytest.mark.parametrize("box", [np.array, Series])
+    def test_bool_flex_series(self, box):
+        # Series
+        # list/tuple
+        data = np.random.default_rng(2).standard_normal((5, 3))
+        df = DataFrame(data)
+        idx_ser = box(np.random.default_rng(2).standard_normal(5))
+        col_ser = box(np.random.default_rng(2).standard_normal(3))
+
+        idx_eq = df.eq(idx_ser, axis=0)
+        col_eq = df.eq(col_ser)
+        idx_ne = df.ne(idx_ser, axis=0)
+        col_ne = df.ne(col_ser)
+        tm.assert_frame_equal(col_eq, df == Series(col_ser))
+        tm.assert_frame_equal(col_eq, -col_ne)
+        tm.assert_frame_equal(idx_eq, -idx_ne)
+        tm.assert_frame_equal(idx_eq, df.T.eq(idx_ser).T)
+        tm.assert_frame_equal(col_eq, df.eq(list(col_ser)))
+        tm.assert_frame_equal(idx_eq, df.eq(Series(idx_ser), axis=0))
+        tm.assert_frame_equal(idx_eq, df.eq(list(idx_ser), axis=0))
+
+        idx_gt = df.gt(idx_ser, axis=0)
+        col_gt = df.gt(col_ser)
+        idx_le = df.le(idx_ser, axis=0)
+        col_le = df.le(col_ser)
+
+        tm.assert_frame_equal(col_gt, df > Series(col_ser))
+        tm.assert_frame_equal(col_gt, -col_le)
+        tm.assert_frame_equal(idx_gt, -idx_le)
+        tm.assert_frame_equal(idx_gt, df.T.gt(idx_ser).T)
+
+        idx_ge = df.ge(idx_ser, axis=0)
+        col_ge = df.ge(col_ser)
+        idx_lt = df.lt(idx_ser, axis=0)
+        col_lt = df.lt(col_ser)
+        tm.assert_frame_equal(col_ge, df >= Series(col_ser))
+        tm.assert_frame_equal(col_ge, -col_lt)
+        tm.assert_frame_equal(idx_ge, -idx_lt)
+        tm.assert_frame_equal(idx_ge, df.T.ge(idx_ser).T)
+
+        idx_ser = Series(np.random.default_rng(2).standard_normal(5))
+        col_ser = Series(np.random.default_rng(2).standard_normal(3))
+
+    def test_bool_flex_frame_na(self):
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        # NA
+        df.loc[0, 0] = np.nan
+        rs = df.eq(df)
+        assert not rs.loc[0, 0]
+        rs = df.ne(df)
+        assert rs.loc[0, 0]
+        rs = df.gt(df)
+        assert not rs.loc[0, 0]
+        rs = df.lt(df)
+        assert not rs.loc[0, 0]
+        rs = df.ge(df)
+        assert not rs.loc[0, 0]
+        rs = df.le(df)
+        assert not rs.loc[0, 0]
+
+    def test_bool_flex_frame_complex_dtype(self):
+        # complex
+        arr = np.array([np.nan, 1, 6, np.nan])
+        arr2 = np.array([2j, np.nan, 7, None])
+        df = DataFrame({"a": arr})
+        df2 = DataFrame({"a": arr2})
+
+        msg = "|".join(
+            [
+                "'>' not supported between instances of '.*' and 'complex'",
+                r"unorderable types: .*complex\(\)",  # PY35
+            ]
+        )
+        with pytest.raises(TypeError, match=msg):
+            # inequalities are not well-defined for complex numbers
+            df.gt(df2)
+        with pytest.raises(TypeError, match=msg):
+            # regression test that we get the same behavior for Series
+            df["a"].gt(df2["a"])
+        with pytest.raises(TypeError, match=msg):
+            # Check that we match numpy behavior here
+            df.values > df2.values
+
+        rs = df.ne(df2)
+        assert rs.values.all()
+
+        arr3 = np.array([2j, np.nan, None])
+        df3 = DataFrame({"a": arr3})
+
+        with pytest.raises(TypeError, match=msg):
+            # inequalities are not well-defined for complex numbers
+            df3.gt(2j)
+        with pytest.raises(TypeError, match=msg):
+            # regression test that we get the same behavior for Series
+            df3["a"].gt(2j)
+        with pytest.raises(TypeError, match=msg):
+            # Check that we match numpy behavior here
+            df3.values > 2j
+
+    def test_bool_flex_frame_object_dtype(self):
+        # corner, dtype=object
+        df1 = DataFrame({"col": ["foo", np.nan, "bar"]}, dtype=object)
+        df2 = DataFrame({"col": ["foo", datetime.now(), "bar"]}, dtype=object)
+        result = df1.ne(df2)
+        exp = DataFrame({"col": [False, True, False]})
+        tm.assert_frame_equal(result, exp)
+
+    def test_flex_comparison_nat(self):
+        # GH 15697, GH 22163 df.eq(pd.NaT) should behave like df == pd.NaT,
+        # and _definitely_ not be NaN
+        df = DataFrame([pd.NaT])
+
+        result = df == pd.NaT
+        # result.iloc[0, 0] is a np.bool_ object
+        assert result.iloc[0, 0].item() is False
+
+        result = df.eq(pd.NaT)
+        assert result.iloc[0, 0].item() is False
+
+        result = df != pd.NaT
+        assert result.iloc[0, 0].item() is True
+
+        result = df.ne(pd.NaT)
+        assert result.iloc[0, 0].item() is True
+
+    @pytest.mark.parametrize("opname", ["eq", "ne", "gt", "lt", "ge", "le"])
+    def test_df_flex_cmp_constant_return_types(self, opname):
+        # GH 15077, non-empty DataFrame
+        df = DataFrame({"x": [1, 2, 3], "y": [1.0, 2.0, 3.0]})
+        const = 2
+
+        result = getattr(df, opname)(const).dtypes.value_counts()
+        tm.assert_series_equal(
+            result, Series([2], index=[np.dtype(bool)], name="count")
+        )
+
+    @pytest.mark.parametrize("opname", ["eq", "ne", "gt", "lt", "ge", "le"])
+    def test_df_flex_cmp_constant_return_types_empty(self, opname):
+        # GH 15077 empty DataFrame
+        df = DataFrame({"x": [1, 2, 3], "y": [1.0, 2.0, 3.0]})
+        const = 2
+
+        empty = df.iloc[:0]
+        result = getattr(empty, opname)(const).dtypes.value_counts()
+        tm.assert_series_equal(
+            result, Series([2], index=[np.dtype(bool)], name="count")
+        )
+
+    def test_df_flex_cmp_ea_dtype_with_ndarray_series(self):
+        ii = pd.IntervalIndex.from_breaks([1, 2, 3])
+        df = DataFrame({"A": ii, "B": ii})
+
+        ser = Series([0, 0])
+        res = df.eq(ser, axis=0)
+
+        expected = DataFrame({"A": [False, False], "B": [False, False]})
+        tm.assert_frame_equal(res, expected)
+
+        ser2 = Series([1, 2], index=["A", "B"])
+        res2 = df.eq(ser2, axis=1)
+        tm.assert_frame_equal(res2, expected)
+
+
+# -------------------------------------------------------------------
+# Arithmetic
+
+
+class TestFrameFlexArithmetic:
+    def test_floordiv_axis0(self):
+        # make sure we df.floordiv(ser, axis=0) matches column-wise result
+        arr = np.arange(3)
+        ser = Series(arr)
+        df = DataFrame({"A": ser, "B": ser})
+
+        result = df.floordiv(ser, axis=0)
+
+        expected = DataFrame({col: df[col] // ser for col in df.columns})
+
+        tm.assert_frame_equal(result, expected)
+
+        result2 = df.floordiv(ser.values, axis=0)
+        tm.assert_frame_equal(result2, expected)
+
+    def test_df_add_td64_columnwise(self):
+        # GH 22534 Check that column-wise addition broadcasts correctly
+        dti = pd.date_range("2016-01-01", periods=10)
+        tdi = pd.timedelta_range("1", periods=10)
+        tser = Series(tdi)
+        df = DataFrame({0: dti, 1: tdi})
+
+        result = df.add(tser, axis=0)
+        expected = DataFrame({0: dti + tdi, 1: tdi + tdi})
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_add_flex_filled_mixed_dtypes(self):
+        # GH 19611
+        dti = pd.date_range("2016-01-01", periods=3)
+        ser = Series(["1 Day", "NaT", "2 Days"], dtype="timedelta64[ns]")
+        df = DataFrame({"A": dti, "B": ser})
+        other = DataFrame({"A": ser, "B": ser})
+        fill = pd.Timedelta(days=1).to_timedelta64()
+        result = df.add(other, fill_value=fill)
+
+        expected = DataFrame(
+            {
+                "A": Series(
+                    ["2016-01-02", "2016-01-03", "2016-01-05"], dtype="datetime64[ns]"
+                ),
+                "B": ser * 2,
+            }
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_arith_flex_frame(
+        self, all_arithmetic_operators, float_frame, mixed_float_frame
+    ):
+        # one instance of parametrized fixture
+        op = all_arithmetic_operators
+
+        def f(x, y):
+            # r-versions not in operator-stdlib; get op without "r" and invert
+            if op.startswith("__r"):
+                return getattr(operator, op.replace("__r", "__"))(y, x)
+            return getattr(operator, op)(x, y)
+
+        result = getattr(float_frame, op)(2 * float_frame)
+        expected = f(float_frame, 2 * float_frame)
+        tm.assert_frame_equal(result, expected)
+
+        # vs mix float
+        result = getattr(mixed_float_frame, op)(2 * mixed_float_frame)
+        expected = f(mixed_float_frame, 2 * mixed_float_frame)
+        tm.assert_frame_equal(result, expected)
+        _check_mixed_float(result, dtype={"C": None})
+
+    @pytest.mark.parametrize("op", ["__add__", "__sub__", "__mul__"])
+    def test_arith_flex_frame_mixed(
+        self,
+        op,
+        int_frame,
+        mixed_int_frame,
+        mixed_float_frame,
+        switch_numexpr_min_elements,
+    ):
+        f = getattr(operator, op)
+
+        # vs mix int
+        result = getattr(mixed_int_frame, op)(2 + mixed_int_frame)
+        expected = f(mixed_int_frame, 2 + mixed_int_frame)
+
+        # no overflow in the uint
+        dtype = None
+        if op in ["__sub__"]:
+            dtype = {"B": "uint64", "C": None}
+        elif op in ["__add__", "__mul__"]:
+            dtype = {"C": None}
+        if expr.USE_NUMEXPR and switch_numexpr_min_elements == 0:
+            # when using numexpr, the casting rules are slightly different:
+            # in the `2 + mixed_int_frame` operation, int32 column becomes
+            # and int64 column (not preserving dtype in operation with Python
+            # scalar), and then the int32/int64 combo results in int64 result
+            dtype["A"] = (2 + mixed_int_frame)["A"].dtype
+        tm.assert_frame_equal(result, expected)
+        _check_mixed_int(result, dtype=dtype)
+
+        # vs mix float
+        result = getattr(mixed_float_frame, op)(2 * mixed_float_frame)
+        expected = f(mixed_float_frame, 2 * mixed_float_frame)
+        tm.assert_frame_equal(result, expected)
+        _check_mixed_float(result, dtype={"C": None})
+
+        # vs plain int
+        result = getattr(int_frame, op)(2 * int_frame)
+        expected = f(int_frame, 2 * int_frame)
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("dim", range(3, 6))
+    def test_arith_flex_frame_raise(self, all_arithmetic_operators, float_frame, dim):
+        # one instance of parametrized fixture
+        op = all_arithmetic_operators
+
+        # Check that arrays with dim >= 3 raise
+        arr = np.ones((1,) * dim)
+        msg = "Unable to coerce to Series/DataFrame"
+        with pytest.raises(ValueError, match=msg):
+            getattr(float_frame, op)(arr)
+
+    def test_arith_flex_frame_corner(self, float_frame):
+        const_add = float_frame.add(1)
+        tm.assert_frame_equal(const_add, float_frame + 1)
+
+        # corner cases
+        result = float_frame.add(float_frame[:0])
+        expected = float_frame.sort_index() * np.nan
+        tm.assert_frame_equal(result, expected)
+
+        result = float_frame[:0].add(float_frame)
+        expected = float_frame.sort_index() * np.nan
+        tm.assert_frame_equal(result, expected)
+
+        with pytest.raises(NotImplementedError, match="fill_value"):
+            float_frame.add(float_frame.iloc[0], fill_value=3)
+
+        with pytest.raises(NotImplementedError, match="fill_value"):
+            float_frame.add(float_frame.iloc[0], axis="index", fill_value=3)
+
+    @pytest.mark.parametrize("op", ["add", "sub", "mul", "mod"])
+    def test_arith_flex_series_ops(self, simple_frame, op):
+        # after arithmetic refactor, add truediv here
+        df = simple_frame
+
+        row = df.xs("a")
+        col = df["two"]
+        f = getattr(df, op)
+        op = getattr(operator, op)
+        tm.assert_frame_equal(f(row), op(df, row))
+        tm.assert_frame_equal(f(col, axis=0), op(df.T, col).T)
+
+    def test_arith_flex_series(self, simple_frame):
+        df = simple_frame
+
+        row = df.xs("a")
+        col = df["two"]
+        # special case for some reason
+        tm.assert_frame_equal(df.add(row, axis=None), df + row)
+
+        # cases which will be refactored after big arithmetic refactor
+        tm.assert_frame_equal(df.div(row), df / row)
+        tm.assert_frame_equal(df.div(col, axis=0), (df.T / col).T)
+
+    @pytest.mark.parametrize("dtype", ["int64", "float64"])
+    def test_arith_flex_series_broadcasting(self, dtype):
+        # broadcasting issue in GH 7325
+        df = DataFrame(np.arange(3 * 2).reshape((3, 2)), dtype=dtype)
+        expected = DataFrame([[np.nan, np.inf], [1.0, 1.5], [1.0, 1.25]])
+        result = df.div(df[0], axis="index")
+        tm.assert_frame_equal(result, expected)
+
+    def test_arith_flex_zero_len_raises(self):
+        # GH 19522 passing fill_value to frame flex arith methods should
+        # raise even in the zero-length special cases
+        ser_len0 = Series([], dtype=object)
+        df_len0 = DataFrame(columns=["A", "B"])
+        df = DataFrame([[1, 2], [3, 4]], columns=["A", "B"])
+
+        with pytest.raises(NotImplementedError, match="fill_value"):
+            df.add(ser_len0, fill_value="E")
+
+        with pytest.raises(NotImplementedError, match="fill_value"):
+            df_len0.sub(df["A"], axis=None, fill_value=3)
+
+    def test_flex_add_scalar_fill_value(self):
+        # GH#12723
+        dat = np.array([0, 1, np.nan, 3, 4, 5], dtype="float")
+        df = DataFrame({"foo": dat}, index=range(6))
+
+        exp = df.fillna(0).add(2)
+        res = df.add(2, fill_value=0)
+        tm.assert_frame_equal(res, exp)
+
+    def test_sub_alignment_with_duplicate_index(self):
+        # GH#5185 dup aligning operations should work
+        df1 = DataFrame([1, 2, 3, 4, 5], index=[1, 2, 1, 2, 3])
+        df2 = DataFrame([1, 2, 3], index=[1, 2, 3])
+        expected = DataFrame([0, 2, 0, 2, 2], index=[1, 1, 2, 2, 3])
+        result = df1.sub(df2)
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("op", ["__add__", "__mul__", "__sub__", "__truediv__"])
+    def test_arithmetic_with_duplicate_columns(self, op):
+        # operations
+        df = DataFrame({"A": np.arange(10), "B": np.random.default_rng(2).random(10)})
+        expected = getattr(df, op)(df)
+        expected.columns = ["A", "A"]
+        df.columns = ["A", "A"]
+        result = getattr(df, op)(df)
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("level", [0, None])
+    def test_broadcast_multiindex(self, level):
+        # GH34388
+        df1 = DataFrame({"A": [0, 1, 2], "B": [1, 2, 3]})
+        df1.columns = df1.columns.set_names("L1")
+
+        df2 = DataFrame({("A", "C"): [0, 0, 0], ("A", "D"): [0, 0, 0]})
+        df2.columns = df2.columns.set_names(["L1", "L2"])
+
+        result = df1.add(df2, level=level)
+        expected = DataFrame({("A", "C"): [0, 1, 2], ("A", "D"): [0, 1, 2]})
+        expected.columns = expected.columns.set_names(["L1", "L2"])
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_frame_multiindex_operations(self):
+        # GH 43321
+        df = DataFrame(
+            {2010: [1, 2, 3], 2020: [3, 4, 5]},
+            index=MultiIndex.from_product(
+                [["a"], ["b"], [0, 1, 2]], names=["scen", "mod", "id"]
+            ),
+        )
+
+        series = Series(
+            [0.4],
+            index=MultiIndex.from_product([["b"], ["a"]], names=["mod", "scen"]),
+        )
+
+        expected = DataFrame(
+            {2010: [1.4, 2.4, 3.4], 2020: [3.4, 4.4, 5.4]},
+            index=MultiIndex.from_product(
+                [["a"], ["b"], [0, 1, 2]], names=["scen", "mod", "id"]
+            ),
+        )
+        result = df.add(series, axis=0)
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_frame_multiindex_operations_series_index_to_frame_index(self):
+        # GH 43321
+        df = DataFrame(
+            {2010: [1], 2020: [3]},
+            index=MultiIndex.from_product([["a"], ["b"]], names=["scen", "mod"]),
+        )
+
+        series = Series(
+            [10.0, 20.0, 30.0],
+            index=MultiIndex.from_product(
+                [["a"], ["b"], [0, 1, 2]], names=["scen", "mod", "id"]
+            ),
+        )
+
+        expected = DataFrame(
+            {2010: [11.0, 21, 31.0], 2020: [13.0, 23.0, 33.0]},
+            index=MultiIndex.from_product(
+                [["a"], ["b"], [0, 1, 2]], names=["scen", "mod", "id"]
+            ),
+        )
+        result = df.add(series, axis=0)
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_frame_multiindex_operations_no_align(self):
+        df = DataFrame(
+            {2010: [1, 2, 3], 2020: [3, 4, 5]},
+            index=MultiIndex.from_product(
+                [["a"], ["b"], [0, 1, 2]], names=["scen", "mod", "id"]
+            ),
+        )
+
+        series = Series(
+            [0.4],
+            index=MultiIndex.from_product([["c"], ["a"]], names=["mod", "scen"]),
+        )
+
+        expected = DataFrame(
+            {2010: np.nan, 2020: np.nan},
+            index=MultiIndex.from_tuples(
+                [
+                    ("a", "b", 0),
+                    ("a", "b", 1),
+                    ("a", "b", 2),
+                    ("a", "c", np.nan),
+                ],
+                names=["scen", "mod", "id"],
+            ),
+        )
+        result = df.add(series, axis=0)
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_frame_multiindex_operations_part_align(self):
+        df = DataFrame(
+            {2010: [1, 2, 3], 2020: [3, 4, 5]},
+            index=MultiIndex.from_tuples(
+                [
+                    ("a", "b", 0),
+                    ("a", "b", 1),
+                    ("a", "c", 2),
+                ],
+                names=["scen", "mod", "id"],
+            ),
+        )
+
+        series = Series(
+            [0.4],
+            index=MultiIndex.from_product([["b"], ["a"]], names=["mod", "scen"]),
+        )
+
+        expected = DataFrame(
+            {2010: [1.4, 2.4, np.nan], 2020: [3.4, 4.4, np.nan]},
+            index=MultiIndex.from_tuples(
+                [
+                    ("a", "b", 0),
+                    ("a", "b", 1),
+                    ("a", "c", 2),
+                ],
+                names=["scen", "mod", "id"],
+            ),
+        )
+        result = df.add(series, axis=0)
+
+        tm.assert_frame_equal(result, expected)
+
+
+class TestFrameArithmetic:
+    def test_td64_op_nat_casting(self):
+        # Make sure we don't accidentally treat timedelta64(NaT) as datetime64
+        #  when calling dispatch_to_series in DataFrame arithmetic
+        ser = Series(["NaT", "NaT"], dtype="timedelta64[ns]")
+        df = DataFrame([[1, 2], [3, 4]])
+
+        result = df * ser
+        expected = DataFrame({0: ser, 1: ser})
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_add_2d_array_rowlike_broadcasts(self):
+        # GH#23000
+        arr = np.arange(6).reshape(3, 2)
+        df = DataFrame(arr, columns=[True, False], index=["A", "B", "C"])
+
+        rowlike = arr[[1], :]  # shape --> (1, ncols)
+        assert rowlike.shape == (1, df.shape[1])
+
+        expected = DataFrame(
+            [[2, 4], [4, 6], [6, 8]],
+            columns=df.columns,
+            index=df.index,
+            # specify dtype explicitly to avoid failing
+            # on 32bit builds
+            dtype=arr.dtype,
+        )
+        result = df + rowlike
+        tm.assert_frame_equal(result, expected)
+        result = rowlike + df
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_add_2d_array_collike_broadcasts(self):
+        # GH#23000
+        arr = np.arange(6).reshape(3, 2)
+        df = DataFrame(arr, columns=[True, False], index=["A", "B", "C"])
+
+        collike = arr[:, [1]]  # shape --> (nrows, 1)
+        assert collike.shape == (df.shape[0], 1)
+
+        expected = DataFrame(
+            [[1, 2], [5, 6], [9, 10]],
+            columns=df.columns,
+            index=df.index,
+            # specify dtype explicitly to avoid failing
+            # on 32bit builds
+            dtype=arr.dtype,
+        )
+        result = df + collike
+        tm.assert_frame_equal(result, expected)
+        result = collike + df
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_arith_2d_array_rowlike_broadcasts(
+        self, request, all_arithmetic_operators, using_array_manager
+    ):
+        # GH#23000
+        opname = all_arithmetic_operators
+
+        if using_array_manager and opname in ("__rmod__", "__rfloordiv__"):
+            # TODO(ArrayManager) decide on dtypes
+            td.mark_array_manager_not_yet_implemented(request)
+
+        arr = np.arange(6).reshape(3, 2)
+        df = DataFrame(arr, columns=[True, False], index=["A", "B", "C"])
+
+        rowlike = arr[[1], :]  # shape --> (1, ncols)
+        assert rowlike.shape == (1, df.shape[1])
+
+        exvals = [
+            getattr(df.loc["A"], opname)(rowlike.squeeze()),
+            getattr(df.loc["B"], opname)(rowlike.squeeze()),
+            getattr(df.loc["C"], opname)(rowlike.squeeze()),
+        ]
+
+        expected = DataFrame(exvals, columns=df.columns, index=df.index)
+
+        result = getattr(df, opname)(rowlike)
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_arith_2d_array_collike_broadcasts(
+        self, request, all_arithmetic_operators, using_array_manager
+    ):
+        # GH#23000
+        opname = all_arithmetic_operators
+
+        if using_array_manager and opname in ("__rmod__", "__rfloordiv__"):
+            # TODO(ArrayManager) decide on dtypes
+            td.mark_array_manager_not_yet_implemented(request)
+
+        arr = np.arange(6).reshape(3, 2)
+        df = DataFrame(arr, columns=[True, False], index=["A", "B", "C"])
+
+        collike = arr[:, [1]]  # shape --> (nrows, 1)
+        assert collike.shape == (df.shape[0], 1)
+
+        exvals = {
+            True: getattr(df[True], opname)(collike.squeeze()),
+            False: getattr(df[False], opname)(collike.squeeze()),
+        }
+
+        dtype = None
+        if opname in ["__rmod__", "__rfloordiv__"]:
+            # Series ops may return mixed int/float dtypes in cases where
+            #   DataFrame op will return all-float.  So we upcast `expected`
+            dtype = np.common_type(*(x.values for x in exvals.values()))
+
+        expected = DataFrame(exvals, columns=df.columns, index=df.index, dtype=dtype)
+
+        result = getattr(df, opname)(collike)
+        tm.assert_frame_equal(result, expected)
+
+    def test_df_bool_mul_int(self):
+        # GH 22047, GH 22163 multiplication by 1 should result in int dtype,
+        # not object dtype
+        df = DataFrame([[False, True], [False, False]])
+        result = df * 1
+
+        # On appveyor this comes back as np.int32 instead of np.int64,
+        # so we check dtype.kind instead of just dtype
+        kinds = result.dtypes.apply(lambda x: x.kind)
+        assert (kinds == "i").all()
+
+        result = 1 * df
+        kinds = result.dtypes.apply(lambda x: x.kind)
+        assert (kinds == "i").all()
+
+    def test_arith_mixed(self):
+        left = DataFrame({"A": ["a", "b", "c"], "B": [1, 2, 3]})
+
+        result = left + left
+        expected = DataFrame({"A": ["aa", "bb", "cc"], "B": [2, 4, 6]})
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("col", ["A", "B"])
+    def test_arith_getitem_commute(self, all_arithmetic_functions, col):
+        df = DataFrame({"A": [1.1, 3.3], "B": [2.5, -3.9]})
+        result = all_arithmetic_functions(df, 1)[col]
+        expected = all_arithmetic_functions(df[col], 1)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "values", [[1, 2], (1, 2), np.array([1, 2]), range(1, 3), deque([1, 2])]
+    )
+    def test_arith_alignment_non_pandas_object(self, values):
+        # GH#17901
+        df = DataFrame({"A": [1, 1], "B": [1, 1]})
+        expected = DataFrame({"A": [2, 2], "B": [3, 3]})
+        result = df + values
+        tm.assert_frame_equal(result, expected)
+
+    def test_arith_non_pandas_object(self):
+        df = DataFrame(
+            np.arange(1, 10, dtype="f8").reshape(3, 3),
+            columns=["one", "two", "three"],
+            index=["a", "b", "c"],
+        )
+
+        val1 = df.xs("a").values
+        added = DataFrame(df.values + val1, index=df.index, columns=df.columns)
+        tm.assert_frame_equal(df + val1, added)
+
+        added = DataFrame((df.values.T + val1).T, index=df.index, columns=df.columns)
+        tm.assert_frame_equal(df.add(val1, axis=0), added)
+
+        val2 = list(df["two"])
+
+        added = DataFrame(df.values + val2, index=df.index, columns=df.columns)
+        tm.assert_frame_equal(df + val2, added)
+
+        added = DataFrame((df.values.T + val2).T, index=df.index, columns=df.columns)
+        tm.assert_frame_equal(df.add(val2, axis="index"), added)
+
+        val3 = np.random.default_rng(2).random(df.shape)
+        added = DataFrame(df.values + val3, index=df.index, columns=df.columns)
+        tm.assert_frame_equal(df.add(val3), added)
+
+    def test_operations_with_interval_categories_index(self, all_arithmetic_operators):
+        # GH#27415
+        op = all_arithmetic_operators
+        ind = pd.CategoricalIndex(pd.interval_range(start=0.0, end=2.0))
+        data = [1, 2]
+        df = DataFrame([data], columns=ind)
+        num = 10
+        result = getattr(df, op)(num)
+        expected = DataFrame([[getattr(n, op)(num) for n in data]], columns=ind)
+        tm.assert_frame_equal(result, expected)
+
+    def test_frame_with_frame_reindex(self):
+        # GH#31623
+        df = DataFrame(
+            {
+                "foo": [pd.Timestamp("2019"), pd.Timestamp("2020")],
+                "bar": [pd.Timestamp("2018"), pd.Timestamp("2021")],
+            },
+            columns=["foo", "bar"],
+            dtype="M8[ns]",
+        )
+        df2 = df[["foo"]]
+
+        result = df - df2
+
+        expected = DataFrame(
+            {"foo": [pd.Timedelta(0), pd.Timedelta(0)], "bar": [np.nan, np.nan]},
+            columns=["bar", "foo"],
+        )
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "value, dtype",
+        [
+            (1, "i8"),
+            (1.0, "f8"),
+            (2**63, "f8"),
+            (1j, "complex128"),
+            (2**63, "complex128"),
+            (True, "bool"),
+            (np.timedelta64(20, "ns"), "<m8[ns]"),
+            (np.datetime64(20, "ns"), "<M8[ns]"),
+        ],
+    )
+    @pytest.mark.parametrize(
+        "op",
+        [
+            operator.add,
+            operator.sub,
+            operator.mul,
+            operator.truediv,
+            operator.mod,
+            operator.pow,
+        ],
+        ids=lambda x: x.__name__,
+    )
+    def test_binop_other(self, op, value, dtype, switch_numexpr_min_elements):
+        skip = {
+            (operator.truediv, "bool"),
+            (operator.pow, "bool"),
+            (operator.add, "bool"),
+            (operator.mul, "bool"),
+        }
+
+        elem = DummyElement(value, dtype)
+        df = DataFrame({"A": [elem.value, elem.value]}, dtype=elem.dtype)
+
+        invalid = {
+            (operator.pow, "<M8[ns]"),
+            (operator.mod, "<M8[ns]"),
+            (operator.truediv, "<M8[ns]"),
+            (operator.mul, "<M8[ns]"),
+            (operator.add, "<M8[ns]"),
+            (operator.pow, "<m8[ns]"),
+            (operator.mul, "<m8[ns]"),
+            (operator.sub, "bool"),
+            (operator.mod, "complex128"),
+        }
+
+        if (op, dtype) in invalid:
+            warn = None
+            if (dtype == "<M8[ns]" and op == operator.add) or (
+                dtype == "<m8[ns]" and op == operator.mul
+            ):
+                msg = None
+            elif dtype == "complex128":
+                msg = "ufunc 'remainder' not supported for the input types"
+            elif op is operator.sub:
+                msg = "numpy boolean subtract, the `-` operator, is "
+                if (
+                    dtype == "bool"
+                    and expr.USE_NUMEXPR
+                    and switch_numexpr_min_elements == 0
+                ):
+                    warn = UserWarning  # "evaluating in Python space because ..."
+            else:
+                msg = (
+                    f"cannot perform __{op.__name__}__ with this "
+                    "index type: (DatetimeArray|TimedeltaArray)"
+                )
+
+            with pytest.raises(TypeError, match=msg):
+                with tm.assert_produces_warning(warn):
+                    op(df, elem.value)
+
+        elif (op, dtype) in skip:
+            if op in [operator.add, operator.mul]:
+                if expr.USE_NUMEXPR and switch_numexpr_min_elements == 0:
+                    # "evaluating in Python space because ..."
+                    warn = UserWarning
+                else:
+                    warn = None
+                with tm.assert_produces_warning(warn):
+                    op(df, elem.value)
+
+            else:
+                msg = "operator '.*' not implemented for .* dtypes"
+                with pytest.raises(NotImplementedError, match=msg):
+                    op(df, elem.value)
+
+        else:
+            with tm.assert_produces_warning(None):
+                result = op(df, elem.value).dtypes
+                expected = op(df, value).dtypes
+            tm.assert_series_equal(result, expected)
+
+    def test_arithmetic_midx_cols_different_dtypes(self):
+        # GH#49769
+        midx = MultiIndex.from_arrays([Series([1, 2]), Series([3, 4])])
+        midx2 = MultiIndex.from_arrays([Series([1, 2], dtype="Int8"), Series([3, 4])])
+        left = DataFrame([[1, 2], [3, 4]], columns=midx)
+        right = DataFrame([[1, 2], [3, 4]], columns=midx2)
+        result = left - right
+        expected = DataFrame([[0, 0], [0, 0]], columns=midx)
+        tm.assert_frame_equal(result, expected)
+
+    def test_arithmetic_midx_cols_different_dtypes_different_order(self):
+        # GH#49769
+        midx = MultiIndex.from_arrays([Series([1, 2]), Series([3, 4])])
+        midx2 = MultiIndex.from_arrays([Series([2, 1], dtype="Int8"), Series([4, 3])])
+        left = DataFrame([[1, 2], [3, 4]], columns=midx)
+        right = DataFrame([[1, 2], [3, 4]], columns=midx2)
+        result = left - right
+        expected = DataFrame([[-1, 1], [-1, 1]], columns=midx)
+        tm.assert_frame_equal(result, expected)
+
+
+def test_frame_with_zero_len_series_corner_cases():
+    # GH#28600
+    # easy all-float case
+    df = DataFrame(
+        np.random.default_rng(2).standard_normal(6).reshape(3, 2), columns=["A", "B"]
+    )
+    ser = Series(dtype=np.float64)
+
+    result = df + ser
+    expected = DataFrame(df.values * np.nan, columns=df.columns)
+    tm.assert_frame_equal(result, expected)
+
+    with pytest.raises(ValueError, match="not aligned"):
+        # Automatic alignment for comparisons deprecated GH#36795, enforced 2.0
+        df == ser
+
+    # non-float case should not raise TypeError on comparison
+    df2 = DataFrame(df.values.view("M8[ns]"), columns=df.columns)
+    with pytest.raises(ValueError, match="not aligned"):
+        # Automatic alignment for comparisons deprecated
+        df2 == ser
+
+
+def test_zero_len_frame_with_series_corner_cases():
+    # GH#28600
+    df = DataFrame(columns=["A", "B"], dtype=np.float64)
+    ser = Series([1, 2], index=["A", "B"])
+
+    result = df + ser
+    expected = df
+    tm.assert_frame_equal(result, expected)
+
+
+def test_frame_single_columns_object_sum_axis_1():
+    # GH 13758
+    data = {
+        "One": Series(["A", 1.2, np.nan]),
+    }
+    df = DataFrame(data)
+    result = df.sum(axis=1)
+    expected = Series(["A", 1.2, 0])
+    tm.assert_series_equal(result, expected)
+
+
+# -------------------------------------------------------------------
+# Unsorted
+#  These arithmetic tests were previously in other files, eventually
+#  should be parametrized and put into tests.arithmetic
+
+
+class TestFrameArithmeticUnsorted:
+    def test_frame_add_tz_mismatch_converts_to_utc(self):
+        rng = pd.date_range("1/1/2011", periods=10, freq="h", tz="US/Eastern")
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal(len(rng)), index=rng, columns=["a"]
+        )
+
+        df_moscow = df.tz_convert("Europe/Moscow")
+        result = df + df_moscow
+        assert result.index.tz is timezone.utc
+
+        result = df_moscow + df
+        assert result.index.tz is timezone.utc
+
+    def test_align_frame(self):
+        rng = pd.period_range("1/1/2000", "1/1/2010", freq="Y")
+        ts = DataFrame(
+            np.random.default_rng(2).standard_normal((len(rng), 3)), index=rng
+        )
+
+        result = ts + ts[::2]
+        expected = ts + ts
+        expected.iloc[1::2] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+        half = ts[::2]
+        result = ts + half.take(np.random.default_rng(2).permutation(len(half)))
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "op", [operator.add, operator.sub, operator.mul, operator.truediv]
+    )
+    def test_operators_none_as_na(self, op):
+        df = DataFrame(
+            {"col1": [2, 5.0, 123, None], "col2": [1, 2, 3, 4]}, dtype=object
+        )
+
+        # since filling converts dtypes from object, changed expected to be
+        # object
+        msg = "Downcasting object dtype arrays"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            filled = df.fillna(np.nan)
+        result = op(df, 3)
+        expected = op(filled, 3).astype(object)
+        expected[pd.isna(expected)] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+        result = op(df, df)
+        expected = op(filled, filled).astype(object)
+        expected[pd.isna(expected)] = np.nan
+        tm.assert_frame_equal(result, expected)
+
+        msg = "Downcasting object dtype arrays"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = op(df, df.fillna(7))
+        tm.assert_frame_equal(result, expected)
+
+        msg = "Downcasting object dtype arrays"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = op(df.fillna(7), df)
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("op,res", [("__eq__", False), ("__ne__", True)])
+    # TODO: not sure what's correct here.
+    @pytest.mark.filterwarnings("ignore:elementwise:FutureWarning")
+    def test_logical_typeerror_with_non_valid(self, op, res, float_frame):
+        # we are comparing floats vs a string
+        result = getattr(float_frame, op)("foo")
+        assert bool(result.all().all()) is res
+
+    @pytest.mark.parametrize("op", ["add", "sub", "mul", "div", "truediv"])
+    def test_binary_ops_align(self, op):
+        # test aligning binary ops
+
+        # GH 6681
+        index = MultiIndex.from_product(
+            [list("abc"), ["one", "two", "three"], [1, 2, 3]],
+            names=["first", "second", "third"],
+        )
+
+        df = DataFrame(
+            np.arange(27 * 3).reshape(27, 3),
+            index=index,
+            columns=["value1", "value2", "value3"],
+        ).sort_index()
+
+        idx = pd.IndexSlice
+        opa = getattr(operator, op, None)
+        if opa is None:
+            return
+
+        x = Series([1.0, 10.0, 100.0], [1, 2, 3])
+        result = getattr(df, op)(x, level="third", axis=0)
+
+        expected = pd.concat(
+            [opa(df.loc[idx[:, :, i], :], v) for i, v in x.items()]
+        ).sort_index()
+        tm.assert_frame_equal(result, expected)
+
+        x = Series([1.0, 10.0], ["two", "three"])
+        result = getattr(df, op)(x, level="second", axis=0)
+
+        expected = (
+            pd.concat([opa(df.loc[idx[:, i], :], v) for i, v in x.items()])
+            .reindex_like(df)
+            .sort_index()
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_binary_ops_align_series_dataframe(self):
+        # GH9463 (alignment level of dataframe with series)
+
+        midx = MultiIndex.from_product([["A", "B"], ["a", "b"]])
+        df = DataFrame(np.ones((2, 4), dtype="int64"), columns=midx)
+        s = Series({"a": 1, "b": 2})
+
+        df2 = df.copy()
+        df2.columns.names = ["lvl0", "lvl1"]
+        s2 = s.copy()
+        s2.index.name = "lvl1"
+
+        # different cases of integer/string level names:
+        res1 = df.mul(s, axis=1, level=1)
+        res2 = df.mul(s2, axis=1, level=1)
+        res3 = df2.mul(s, axis=1, level=1)
+        res4 = df2.mul(s2, axis=1, level=1)
+        res5 = df2.mul(s, axis=1, level="lvl1")
+        res6 = df2.mul(s2, axis=1, level="lvl1")
+
+        exp = DataFrame(
+            np.array([[1, 2, 1, 2], [1, 2, 1, 2]], dtype="int64"), columns=midx
+        )
+
+        for res in [res1, res2]:
+            tm.assert_frame_equal(res, exp)
+
+        exp.columns.names = ["lvl0", "lvl1"]
+        for res in [res3, res4, res5, res6]:
+            tm.assert_frame_equal(res, exp)
+
+    def test_add_with_dti_mismatched_tzs(self):
+        base = pd.DatetimeIndex(["2011-01-01", "2011-01-02", "2011-01-03"], tz="UTC")
+        idx1 = base.tz_convert("Asia/Tokyo")[:2]
+        idx2 = base.tz_convert("US/Eastern")[1:]
+
+        df1 = DataFrame({"A": [1, 2]}, index=idx1)
+        df2 = DataFrame({"A": [1, 1]}, index=idx2)
+        exp = DataFrame({"A": [np.nan, 3, np.nan]}, index=base)
+        tm.assert_frame_equal(df1 + df2, exp)
+
+    def test_combineFrame(self, float_frame, mixed_float_frame, mixed_int_frame):
+        frame_copy = float_frame.reindex(float_frame.index[::2])
+
+        del frame_copy["D"]
+        # adding NAs to first 5 values of column "C"
+        frame_copy.loc[: frame_copy.index[4], "C"] = np.nan
+
+        added = float_frame + frame_copy
+
+        indexer = added["A"].dropna().index
+        exp = (float_frame["A"] * 2).copy()
+
+        tm.assert_series_equal(added["A"].dropna(), exp.loc[indexer])
+
+        exp.loc[~exp.index.isin(indexer)] = np.nan
+        tm.assert_series_equal(added["A"], exp.loc[added["A"].index])
+
+        assert np.isnan(added["C"].reindex(frame_copy.index)[:5]).all()
+
+        # assert(False)
+
+        assert np.isnan(added["D"]).all()
+
+        self_added = float_frame + float_frame
+        tm.assert_index_equal(self_added.index, float_frame.index)
+
+        added_rev = frame_copy + float_frame
+        assert np.isnan(added["D"]).all()
+        assert np.isnan(added_rev["D"]).all()
+
+        # corner cases
+
+        # empty
+        plus_empty = float_frame + DataFrame()
+        assert np.isnan(plus_empty.values).all()
+
+        empty_plus = DataFrame() + float_frame
+        assert np.isnan(empty_plus.values).all()
+
+        empty_empty = DataFrame() + DataFrame()
+        assert empty_empty.empty
+
+        # out of order
+        reverse = float_frame.reindex(columns=float_frame.columns[::-1])
+
+        tm.assert_frame_equal(reverse + float_frame, float_frame * 2)
+
+        # mix vs float64, upcast
+        added = float_frame + mixed_float_frame
+        _check_mixed_float(added, dtype="float64")
+        added = mixed_float_frame + float_frame
+        _check_mixed_float(added, dtype="float64")
+
+        # mix vs mix
+        added = mixed_float_frame + mixed_float_frame
+        _check_mixed_float(added, dtype={"C": None})
+
+        # with int
+        added = float_frame + mixed_int_frame
+        _check_mixed_float(added, dtype="float64")
+
+    def test_combine_series(self, float_frame, mixed_float_frame, mixed_int_frame):
+        # Series
+        series = float_frame.xs(float_frame.index[0])
+
+        added = float_frame + series
+
+        for key, s in added.items():
+            tm.assert_series_equal(s, float_frame[key] + series[key])
+
+        larger_series = series.to_dict()
+        larger_series["E"] = 1
+        larger_series = Series(larger_series)
+        larger_added = float_frame + larger_series
+
+        for key, s in float_frame.items():
+            tm.assert_series_equal(larger_added[key], s + series[key])
+        assert "E" in larger_added
+        assert np.isnan(larger_added["E"]).all()
+
+        # no upcast needed
+        added = mixed_float_frame + series
+        assert np.all(added.dtypes == series.dtype)
+
+        # vs mix (upcast) as needed
+        added = mixed_float_frame + series.astype("float32")
+        _check_mixed_float(added, dtype={"C": None})
+        added = mixed_float_frame + series.astype("float16")
+        _check_mixed_float(added, dtype={"C": None})
+
+        # these used to raise with numexpr as we are adding an int64 to an
+        #  uint64....weird vs int
+        added = mixed_int_frame + (100 * series).astype("int64")
+        _check_mixed_int(
+            added, dtype={"A": "int64", "B": "float64", "C": "int64", "D": "int64"}
+        )
+        added = mixed_int_frame + (100 * series).astype("int32")
+        _check_mixed_int(
+            added, dtype={"A": "int32", "B": "float64", "C": "int32", "D": "int64"}
+        )
+
+    def test_combine_timeseries(self, datetime_frame):
+        # TimeSeries
+        ts = datetime_frame["A"]
+
+        # 10890
+        # we no longer allow auto timeseries broadcasting
+        # and require explicit broadcasting
+        added = datetime_frame.add(ts, axis="index")
+
+        for key, col in datetime_frame.items():
+            result = col + ts
+            tm.assert_series_equal(added[key], result, check_names=False)
+            assert added[key].name == key
+            if col.name == ts.name:
+                assert result.name == "A"
+            else:
+                assert result.name is None
+
+        smaller_frame = datetime_frame[:-5]
+        smaller_added = smaller_frame.add(ts, axis="index")
+
+        tm.assert_index_equal(smaller_added.index, datetime_frame.index)
+
+        smaller_ts = ts[:-5]
+        smaller_added2 = datetime_frame.add(smaller_ts, axis="index")
+        tm.assert_frame_equal(smaller_added, smaller_added2)
+
+        # length 0, result is all-nan
+        result = datetime_frame.add(ts[:0], axis="index")
+        expected = DataFrame(
+            np.nan, index=datetime_frame.index, columns=datetime_frame.columns
+        )
+        tm.assert_frame_equal(result, expected)
+
+        # Frame is all-nan
+        result = datetime_frame[:0].add(ts, axis="index")
+        expected = DataFrame(
+            np.nan, index=datetime_frame.index, columns=datetime_frame.columns
+        )
+        tm.assert_frame_equal(result, expected)
+
+        # empty but with non-empty index
+        frame = datetime_frame[:1].reindex(columns=[])
+        result = frame.mul(ts, axis="index")
+        assert len(result) == len(ts)
+
+    def test_combineFunc(self, float_frame, mixed_float_frame):
+        result = float_frame * 2
+        tm.assert_numpy_array_equal(result.values, float_frame.values * 2)
+
+        # vs mix
+        result = mixed_float_frame * 2
+        for c, s in result.items():
+            tm.assert_numpy_array_equal(s.values, mixed_float_frame[c].values * 2)
+        _check_mixed_float(result, dtype={"C": None})
+
+        result = DataFrame() * 2
+        assert result.index.equals(DataFrame().index)
+        assert len(result.columns) == 0
+
+    @pytest.mark.parametrize(
+        "func",
+        [operator.eq, operator.ne, operator.lt, operator.gt, operator.ge, operator.le],
+    )
+    def test_comparisons(self, simple_frame, float_frame, func):
+        df1 = DataFrame(
+            np.random.default_rng(2).standard_normal((30, 4)),
+            columns=Index(list("ABCD"), dtype=object),
+            index=pd.date_range("2000-01-01", periods=30, freq="B"),
+        )
+        df2 = df1.copy()
+
+        row = simple_frame.xs("a")
+        ndim_5 = np.ones(df1.shape + (1, 1, 1))
+
+        result = func(df1, df2)
+        tm.assert_numpy_array_equal(result.values, func(df1.values, df2.values))
+
+        msg = (
+            "Unable to coerce to Series/DataFrame, "
+            "dimension must be <= 2: (30, 4, 1, 1, 1)"
+        )
+        with pytest.raises(ValueError, match=re.escape(msg)):
+            func(df1, ndim_5)
+
+        result2 = func(simple_frame, row)
+        tm.assert_numpy_array_equal(
+            result2.values, func(simple_frame.values, row.values)
+        )
+
+        result3 = func(float_frame, 0)
+        tm.assert_numpy_array_equal(result3.values, func(float_frame.values, 0))
+
+        msg = (
+            r"Can only compare identically-labeled \(both index and columns\) "
+            "DataFrame objects"
+        )
+        with pytest.raises(ValueError, match=msg):
+            func(simple_frame, simple_frame[:2])
+
+    def test_strings_to_numbers_comparisons_raises(self, compare_operators_no_eq_ne):
+        # GH 11565
+        df = DataFrame(
+            {x: {"x": "foo", "y": "bar", "z": "baz"} for x in ["a", "b", "c"]}
+        )
+
+        f = getattr(operator, compare_operators_no_eq_ne)
+        msg = "'[<>]=?' not supported between instances of 'str' and 'int'"
+        with pytest.raises(TypeError, match=msg):
+            f(df, 0)
+
+    def test_comparison_protected_from_errstate(self):
+        missing_df = DataFrame(
+            np.ones((10, 4), dtype=np.float64),
+            columns=Index(list("ABCD"), dtype=object),
+        )
+        missing_df.loc[missing_df.index[0], "A"] = np.nan
+        with np.errstate(invalid="ignore"):
+            expected = missing_df.values < 0
+        with np.errstate(invalid="raise"):
+            result = (missing_df < 0).values
+        tm.assert_numpy_array_equal(result, expected)
+
+    def test_boolean_comparison(self):
+        # GH 4576
+        # boolean comparisons with a tuple/list give unexpected results
+        df = DataFrame(np.arange(6).reshape((3, 2)))
+        b = np.array([2, 2])
+        b_r = np.atleast_2d([2, 2])
+        b_c = b_r.T
+        lst = [2, 2, 2]
+        tup = tuple(lst)
+
+        # gt
+        expected = DataFrame([[False, False], [False, True], [True, True]])
+        result = df > b
+        tm.assert_frame_equal(result, expected)
+
+        result = df.values > b
+        tm.assert_numpy_array_equal(result, expected.values)
+
+        msg1d = "Unable to coerce to Series, length must be 2: given 3"
+        msg2d = "Unable to coerce to DataFrame, shape must be"
+        msg2db = "operands could not be broadcast together with shapes"
+        with pytest.raises(ValueError, match=msg1d):
+            # wrong shape
+            df > lst
+
+        with pytest.raises(ValueError, match=msg1d):
+            # wrong shape
+            df > tup
+
+        # broadcasts like ndarray (GH#23000)
+        result = df > b_r
+        tm.assert_frame_equal(result, expected)
+
+        result = df.values > b_r
+        tm.assert_numpy_array_equal(result, expected.values)
+
+        with pytest.raises(ValueError, match=msg2d):
+            df > b_c
+
+        with pytest.raises(ValueError, match=msg2db):
+            df.values > b_c
+
+        # ==
+        expected = DataFrame([[False, False], [True, False], [False, False]])
+        result = df == b
+        tm.assert_frame_equal(result, expected)
+
+        with pytest.raises(ValueError, match=msg1d):
+            df == lst
+
+        with pytest.raises(ValueError, match=msg1d):
+            df == tup
+
+        # broadcasts like ndarray (GH#23000)
+        result = df == b_r
+        tm.assert_frame_equal(result, expected)
+
+        result = df.values == b_r
+        tm.assert_numpy_array_equal(result, expected.values)
+
+        with pytest.raises(ValueError, match=msg2d):
+            df == b_c
+
+        assert df.values.shape != b_c.shape
+
+        # with alignment
+        df = DataFrame(
+            np.arange(6).reshape((3, 2)), columns=list("AB"), index=list("abc")
+        )
+        expected.index = df.index
+        expected.columns = df.columns
+
+        with pytest.raises(ValueError, match=msg1d):
+            df == lst
+
+        with pytest.raises(ValueError, match=msg1d):
+            df == tup
+
+    def test_inplace_ops_alignment(self):
+        # inplace ops / ops alignment
+        # GH 8511
+
+        columns = list("abcdefg")
+        X_orig = DataFrame(
+            np.arange(10 * len(columns)).reshape(-1, len(columns)),
+            columns=columns,
+            index=range(10),
+        )
+        Z = 100 * X_orig.iloc[:, 1:-1].copy()
+        block1 = list("bedcf")
+        subs = list("bcdef")
+
+        # add
+        X = X_orig.copy()
+        result1 = (X[block1] + Z).reindex(columns=subs)
+
+        X[block1] += Z
+        result2 = X.reindex(columns=subs)
+
+        X = X_orig.copy()
+        result3 = (X[block1] + Z[block1]).reindex(columns=subs)
+
+        X[block1] += Z[block1]
+        result4 = X.reindex(columns=subs)
+
+        tm.assert_frame_equal(result1, result2)
+        tm.assert_frame_equal(result1, result3)
+        tm.assert_frame_equal(result1, result4)
+
+        # sub
+        X = X_orig.copy()
+        result1 = (X[block1] - Z).reindex(columns=subs)
+
+        X[block1] -= Z
+        result2 = X.reindex(columns=subs)
+
+        X = X_orig.copy()
+        result3 = (X[block1] - Z[block1]).reindex(columns=subs)
+
+        X[block1] -= Z[block1]
+        result4 = X.reindex(columns=subs)
+
+        tm.assert_frame_equal(result1, result2)
+        tm.assert_frame_equal(result1, result3)
+        tm.assert_frame_equal(result1, result4)
+
+    def test_inplace_ops_identity(self):
+        # GH 5104
+        # make sure that we are actually changing the object
+        s_orig = Series([1, 2, 3])
+        df_orig = DataFrame(
+            np.random.default_rng(2).integers(0, 5, size=10).reshape(-1, 5)
+        )
+
+        # no dtype change
+        s = s_orig.copy()
+        s2 = s
+        s += 1
+        tm.assert_series_equal(s, s2)
+        tm.assert_series_equal(s_orig + 1, s)
+        assert s is s2
+        assert s._mgr is s2._mgr
+
+        df = df_orig.copy()
+        df2 = df
+        df += 1
+        tm.assert_frame_equal(df, df2)
+        tm.assert_frame_equal(df_orig + 1, df)
+        assert df is df2
+        assert df._mgr is df2._mgr
+
+        # dtype change
+        s = s_orig.copy()
+        s2 = s
+        s += 1.5
+        tm.assert_series_equal(s, s2)
+        tm.assert_series_equal(s_orig + 1.5, s)
+
+        df = df_orig.copy()
+        df2 = df
+        df += 1.5
+        tm.assert_frame_equal(df, df2)
+        tm.assert_frame_equal(df_orig + 1.5, df)
+        assert df is df2
+        assert df._mgr is df2._mgr
+
+        # mixed dtype
+        arr = np.random.default_rng(2).integers(0, 10, size=5)
+        df_orig = DataFrame({"A": arr.copy(), "B": "foo"})
+        df = df_orig.copy()
+        df2 = df
+        df["A"] += 1
+        expected = DataFrame({"A": arr.copy() + 1, "B": "foo"})
+        tm.assert_frame_equal(df, expected)
+        tm.assert_frame_equal(df2, expected)
+        assert df._mgr is df2._mgr
+
+        df = df_orig.copy()
+        df2 = df
+        df["A"] += 1.5
+        expected = DataFrame({"A": arr.copy() + 1.5, "B": "foo"})
+        tm.assert_frame_equal(df, expected)
+        tm.assert_frame_equal(df2, expected)
+        assert df._mgr is df2._mgr
+
+    @pytest.mark.parametrize(
+        "op",
+        [
+            "add",
+            "and",
+            pytest.param(
+                "div",
+                marks=pytest.mark.xfail(
+                    raises=AttributeError, reason="__idiv__ not implemented"
+                ),
+            ),
+            "floordiv",
+            "mod",
+            "mul",
+            "or",
+            "pow",
+            "sub",
+            "truediv",
+            "xor",
+        ],
+    )
+    def test_inplace_ops_identity2(self, op):
+        df = DataFrame({"a": [1.0, 2.0, 3.0], "b": [1, 2, 3]})
+
+        operand = 2
+        if op in ("and", "or", "xor"):
+            # cannot use floats for boolean ops
+            df["a"] = [True, False, True]
+
+        df_copy = df.copy()
+        iop = f"__i{op}__"
+        op = f"__{op}__"
+
+        # no id change and value is correct
+        getattr(df, iop)(operand)
+        expected = getattr(df_copy, op)(operand)
+        tm.assert_frame_equal(df, expected)
+        expected = id(df)
+        assert id(df) == expected
+
+    @pytest.mark.parametrize(
+        "val",
+        [
+            [1, 2, 3],
+            (1, 2, 3),
+            np.array([1, 2, 3], dtype=np.int64),
+            range(1, 4),
+        ],
+    )
+    def test_alignment_non_pandas(self, val):
+        index = ["A", "B", "C"]
+        columns = ["X", "Y", "Z"]
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((3, 3)),
+            index=index,
+            columns=columns,
+        )
+
+        align = DataFrame._align_for_op
+
+        expected = DataFrame({"X": val, "Y": val, "Z": val}, index=df.index)
+        tm.assert_frame_equal(align(df, val, axis=0)[1], expected)
+
+        expected = DataFrame(
+            {"X": [1, 1, 1], "Y": [2, 2, 2], "Z": [3, 3, 3]}, index=df.index
+        )
+        tm.assert_frame_equal(align(df, val, axis=1)[1], expected)
+
+    @pytest.mark.parametrize("val", [[1, 2], (1, 2), np.array([1, 2]), range(1, 3)])
+    def test_alignment_non_pandas_length_mismatch(self, val):
+        index = ["A", "B", "C"]
+        columns = ["X", "Y", "Z"]
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((3, 3)),
+            index=index,
+            columns=columns,
+        )
+
+        align = DataFrame._align_for_op
+        # length mismatch
+        msg = "Unable to coerce to Series, length must be 3: given 2"
+        with pytest.raises(ValueError, match=msg):
+            align(df, val, axis=0)
+
+        with pytest.raises(ValueError, match=msg):
+            align(df, val, axis=1)
+
+    def test_alignment_non_pandas_index_columns(self):
+        index = ["A", "B", "C"]
+        columns = ["X", "Y", "Z"]
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((3, 3)),
+            index=index,
+            columns=columns,
+        )
+
+        align = DataFrame._align_for_op
+        val = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
+        tm.assert_frame_equal(
+            align(df, val, axis=0)[1],
+            DataFrame(val, index=df.index, columns=df.columns),
+        )
+        tm.assert_frame_equal(
+            align(df, val, axis=1)[1],
+            DataFrame(val, index=df.index, columns=df.columns),
+        )
+
+        # shape mismatch
+        msg = "Unable to coerce to DataFrame, shape must be"
+        val = np.array([[1, 2, 3], [4, 5, 6]])
+        with pytest.raises(ValueError, match=msg):
+            align(df, val, axis=0)
+
+        with pytest.raises(ValueError, match=msg):
+            align(df, val, axis=1)
+
+        val = np.zeros((3, 3, 3))
+        msg = re.escape(
+            "Unable to coerce to Series/DataFrame, dimension must be <= 2: (3, 3, 3)"
+        )
+        with pytest.raises(ValueError, match=msg):
+            align(df, val, axis=0)
+        with pytest.raises(ValueError, match=msg):
+            align(df, val, axis=1)
+
+    def test_no_warning(self, all_arithmetic_operators):
+        df = DataFrame({"A": [0.0, 0.0], "B": [0.0, None]})
+        b = df["B"]
+        with tm.assert_produces_warning(None):
+            getattr(df, all_arithmetic_operators)(b)
+
+    def test_dunder_methods_binary(self, all_arithmetic_operators):
+        # GH#??? frame.__foo__ should only accept one argument
+        df = DataFrame({"A": [0.0, 0.0], "B": [0.0, None]})
+        b = df["B"]
+        with pytest.raises(TypeError, match="takes 2 positional arguments"):
+            getattr(df, all_arithmetic_operators)(b, 0)
+
+    def test_align_int_fill_bug(self):
+        # GH#910
+        X = np.arange(10 * 10, dtype="float64").reshape(10, 10)
+        Y = np.ones((10, 1), dtype=int)
+
+        df1 = DataFrame(X)
+        df1["0.X"] = Y.squeeze()
+
+        df2 = df1.astype(float)
+
+        result = df1 - df1.mean()
+        expected = df2 - df2.mean()
+        tm.assert_frame_equal(result, expected)
+
+
+def test_pow_with_realignment():
+    # GH#32685 pow has special semantics for operating with null values
+    left = DataFrame({"A": [0, 1, 2]})
+    right = DataFrame(index=[0, 1, 2])
+
+    result = left**right
+    expected = DataFrame({"A": [np.nan, 1.0, np.nan]})
+    tm.assert_frame_equal(result, expected)
+
+
+def test_dataframe_series_extension_dtypes():
+    # https://github.com/pandas-dev/pandas/issues/34311
+    df = DataFrame(
+        np.random.default_rng(2).integers(0, 100, (10, 3)), columns=["a", "b", "c"]
+    )
+    ser = Series([1, 2, 3], index=["a", "b", "c"])
+
+    expected = df.to_numpy("int64") + ser.to_numpy("int64").reshape(-1, 3)
+    expected = DataFrame(expected, columns=df.columns, dtype="Int64")
+
+    df_ea = df.astype("Int64")
+    result = df_ea + ser
+    tm.assert_frame_equal(result, expected)
+    result = df_ea + ser.astype("Int64")
+    tm.assert_frame_equal(result, expected)
+
+
+def test_dataframe_blockwise_slicelike():
+    # GH#34367
+    arr = np.random.default_rng(2).integers(0, 1000, (100, 10))
+    df1 = DataFrame(arr)
+    # Explicit cast to float to avoid implicit cast when setting nan
+    df2 = df1.copy().astype({1: "float", 3: "float", 7: "float"})
+    df2.iloc[0, [1, 3, 7]] = np.nan
+
+    # Explicit cast to float to avoid implicit cast when setting nan
+    df3 = df1.copy().astype({5: "float"})
+    df3.iloc[0, [5]] = np.nan
+
+    # Explicit cast to float to avoid implicit cast when setting nan
+    df4 = df1.copy().astype({2: "float", 3: "float", 4: "float"})
+    df4.iloc[0, np.arange(2, 5)] = np.nan
+    # Explicit cast to float to avoid implicit cast when setting nan
+    df5 = df1.copy().astype({4: "float", 5: "float", 6: "float"})
+    df5.iloc[0, np.arange(4, 7)] = np.nan
+
+    for left, right in [(df1, df2), (df2, df3), (df4, df5)]:
+        res = left + right
+
+        expected = DataFrame({i: left[i] + right[i] for i in left.columns})
+        tm.assert_frame_equal(res, expected)
+
+
+@pytest.mark.parametrize(
+    "df, col_dtype",
+    [
+        (DataFrame([[1.0, 2.0], [4.0, 5.0]], columns=list("ab")), "float64"),
+        (
+            DataFrame([[1.0, "b"], [4.0, "b"]], columns=list("ab")).astype(
+                {"b": object}
+            ),
+            "object",
+        ),
+    ],
+)
+def test_dataframe_operation_with_non_numeric_types(df, col_dtype):
+    # GH #22663
+    expected = DataFrame([[0.0, np.nan], [3.0, np.nan]], columns=list("ab"))
+    expected = expected.astype({"b": col_dtype})
+    result = df + Series([-1.0], index=list("a"))
+    tm.assert_frame_equal(result, expected)
+
+
+def test_arith_reindex_with_duplicates():
+    # https://github.com/pandas-dev/pandas/issues/35194
+    df1 = DataFrame(data=[[0]], columns=["second"])
+    df2 = DataFrame(data=[[0, 0, 0]], columns=["first", "second", "second"])
+    result = df1 + df2
+    expected = DataFrame([[np.nan, 0, 0]], columns=["first", "second", "second"])
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize("to_add", [[Series([1, 1])], [Series([1, 1]), Series([1, 1])]])
+def test_arith_list_of_arraylike_raise(to_add):
+    # GH 36702. Raise when trying to add list of array-like to DataFrame
+    df = DataFrame({"x": [1, 2], "y": [1, 2]})
+
+    msg = f"Unable to coerce list of {type(to_add[0])} to Series/DataFrame"
+    with pytest.raises(ValueError, match=msg):
+        df + to_add
+    with pytest.raises(ValueError, match=msg):
+        to_add + df
+
+
+def test_inplace_arithmetic_series_update(using_copy_on_write, warn_copy_on_write):
+    # https://github.com/pandas-dev/pandas/issues/36373
+    df = DataFrame({"A": [1, 2, 3]})
+    df_orig = df.copy()
+    series = df["A"]
+    vals = series._values
+
+    with tm.assert_cow_warning(warn_copy_on_write):
+        series += 1
+    if using_copy_on_write:
+        assert series._values is not vals
+        tm.assert_frame_equal(df, df_orig)
+    else:
+        assert series._values is vals
+
+        expected = DataFrame({"A": [2, 3, 4]})
+        tm.assert_frame_equal(df, expected)
+
+
+def test_arithmetic_multiindex_align():
+    """
+    Regression test for: https://github.com/pandas-dev/pandas/issues/33765
+    """
+    df1 = DataFrame(
+        [[1]],
+        index=["a"],
+        columns=MultiIndex.from_product([[0], [1]], names=["a", "b"]),
+    )
+    df2 = DataFrame([[1]], index=["a"], columns=Index([0], name="a"))
+    expected = DataFrame(
+        [[0]],
+        index=["a"],
+        columns=MultiIndex.from_product([[0], [1]], names=["a", "b"]),
+    )
+    result = df1 - df2
+    tm.assert_frame_equal(result, expected)
+
+
+def test_bool_frame_mult_float():
+    # GH 18549
+    df = DataFrame(True, list("ab"), list("cd"))
+    result = df * 1.0
+    expected = DataFrame(np.ones((2, 2)), list("ab"), list("cd"))
+    tm.assert_frame_equal(result, expected)
+
+
+def test_frame_sub_nullable_int(any_int_ea_dtype):
+    # GH 32822
+    series1 = Series([1, 2, None], dtype=any_int_ea_dtype)
+    series2 = Series([1, 2, 3], dtype=any_int_ea_dtype)
+    expected = DataFrame([0, 0, None], dtype=any_int_ea_dtype)
+    result = series1.to_frame() - series2.to_frame()
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.filterwarnings(
+    "ignore:Passing a BlockManager|Passing a SingleBlockManager:DeprecationWarning"
+)
+def test_frame_op_subclass_nonclass_constructor():
+    # GH#43201 subclass._constructor is a function, not the subclass itself
+
+    class SubclassedSeries(Series):
+        @property
+        def _constructor(self):
+            return SubclassedSeries
+
+        @property
+        def _constructor_expanddim(self):
+            return SubclassedDataFrame
+
+    class SubclassedDataFrame(DataFrame):
+        _metadata = ["my_extra_data"]
+
+        def __init__(self, my_extra_data, *args, **kwargs) -> None:
+            self.my_extra_data = my_extra_data
+            super().__init__(*args, **kwargs)
+
+        @property
+        def _constructor(self):
+            return functools.partial(type(self), self.my_extra_data)
+
+        @property
+        def _constructor_sliced(self):
+            return SubclassedSeries
+
+    sdf = SubclassedDataFrame("some_data", {"A": [1, 2, 3], "B": [4, 5, 6]})
+    result = sdf * 2
+    expected = SubclassedDataFrame("some_data", {"A": [2, 4, 6], "B": [8, 10, 12]})
+    tm.assert_frame_equal(result, expected)
+
+    result = sdf + sdf
+    tm.assert_frame_equal(result, expected)
+
+
+def test_enum_column_equality():
+    Cols = Enum("Cols", "col1 col2")
+
+    q1 = DataFrame({Cols.col1: [1, 2, 3]})
+    q2 = DataFrame({Cols.col1: [1, 2, 3]})
+
+    result = q1[Cols.col1] == q2[Cols.col1]
+    expected = Series([True, True, True], name=Cols.col1)
+
+    tm.assert_series_equal(result, expected)
+
+
+def test_mixed_col_index_dtype():
+    # GH 47382
+    df1 = DataFrame(columns=list("abc"), data=1.0, index=[0])
+    df2 = DataFrame(columns=list("abc"), data=0.0, index=[0])
+    df1.columns = df2.columns.astype("string")
+    result = df1 + df2
+    expected = DataFrame(columns=list("abc"), data=1.0, index=[0])
+    tm.assert_frame_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_block_internals.py

@@ -0,0 +1,457 @@
+from datetime import (
+    datetime,
+    timedelta,
+)
+import itertools
+
+import numpy as np
+import pytest
+
+from pandas.errors import PerformanceWarning
+import pandas.util._test_decorators as td
+
+import pandas as pd
+from pandas import (
+    Categorical,
+    DataFrame,
+    Series,
+    Timestamp,
+    date_range,
+    option_context,
+)
+import pandas._testing as tm
+from pandas.core.internals.blocks import NumpyBlock
+
+# Segregated collection of methods that require the BlockManager internal data
+# structure
+
+
+# TODO(ArrayManager) check which of those tests need to be rewritten to test the
+# equivalent for ArrayManager
+pytestmark = td.skip_array_manager_invalid_test
+
+
+class TestDataFrameBlockInternals:
+    def test_setitem_invalidates_datetime_index_freq(self):
+        # GH#24096 altering a datetime64tz column inplace invalidates the
+        #  `freq` attribute on the underlying DatetimeIndex
+
+        dti = date_range("20130101", periods=3, tz="US/Eastern")
+        ts = dti[1]
+
+        df = DataFrame({"B": dti})
+        assert df["B"]._values.freq is None
+
+        df.iloc[1, 0] = pd.NaT
+        assert df["B"]._values.freq is None
+
+        # check that the DatetimeIndex was not altered in place
+        assert dti.freq == "D"
+        assert dti[1] == ts
+
+    def test_cast_internals(self, float_frame):
+        msg = "Passing a BlockManager to DataFrame"
+        with tm.assert_produces_warning(
+            DeprecationWarning, match=msg, check_stacklevel=False
+        ):
+            casted = DataFrame(float_frame._mgr, dtype=int)
+        expected = DataFrame(float_frame._series, dtype=int)
+        tm.assert_frame_equal(casted, expected)
+
+        with tm.assert_produces_warning(
+            DeprecationWarning, match=msg, check_stacklevel=False
+        ):
+            casted = DataFrame(float_frame._mgr, dtype=np.int32)
+        expected = DataFrame(float_frame._series, dtype=np.int32)
+        tm.assert_frame_equal(casted, expected)
+
+    def test_consolidate(self, float_frame):
+        float_frame["E"] = 7.0
+        consolidated = float_frame._consolidate()
+        assert len(consolidated._mgr.blocks) == 1
+
+        # Ensure copy, do I want this?
+        recons = consolidated._consolidate()
+        assert recons is not consolidated
+        tm.assert_frame_equal(recons, consolidated)
+
+        float_frame["F"] = 8.0
+        assert len(float_frame._mgr.blocks) == 3
+
+        return_value = float_frame._consolidate_inplace()
+        assert return_value is None
+        assert len(float_frame._mgr.blocks) == 1
+
+    def test_consolidate_inplace(self, float_frame):
+        # triggers in-place consolidation
+        for letter in range(ord("A"), ord("Z")):
+            float_frame[chr(letter)] = chr(letter)
+
+    def test_modify_values(self, float_frame, using_copy_on_write):
+        if using_copy_on_write:
+            with pytest.raises(ValueError, match="read-only"):
+                float_frame.values[5] = 5
+            assert (float_frame.values[5] != 5).all()
+            return
+
+        float_frame.values[5] = 5
+        assert (float_frame.values[5] == 5).all()
+
+        # unconsolidated
+        float_frame["E"] = 7.0
+        col = float_frame["E"]
+        float_frame.values[6] = 6
+        # as of 2.0 .values does not consolidate, so subsequent calls to .values
+        #  does not share data
+        assert not (float_frame.values[6] == 6).all()
+
+        assert (col == 7).all()
+
+    def test_boolean_set_uncons(self, float_frame):
+        float_frame["E"] = 7.0
+
+        expected = float_frame.values.copy()
+        expected[expected > 1] = 2
+
+        float_frame[float_frame > 1] = 2
+        tm.assert_almost_equal(expected, float_frame.values)
+
+    def test_constructor_with_convert(self):
+        # this is actually mostly a test of lib.maybe_convert_objects
+        # #2845
+        df = DataFrame({"A": [2**63 - 1]})
+        result = df["A"]
+        expected = Series(np.asarray([2**63 - 1], np.int64), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [2**63]})
+        result = df["A"]
+        expected = Series(np.asarray([2**63], np.uint64), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [datetime(2005, 1, 1), True]})
+        result = df["A"]
+        expected = Series(
+            np.asarray([datetime(2005, 1, 1), True], np.object_), name="A"
+        )
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [None, 1]})
+        result = df["A"]
+        expected = Series(np.asarray([np.nan, 1], np.float64), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [1.0, 2]})
+        result = df["A"]
+        expected = Series(np.asarray([1.0, 2], np.float64), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [1.0 + 2.0j, 3]})
+        result = df["A"]
+        expected = Series(np.asarray([1.0 + 2.0j, 3], np.complex128), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [1.0 + 2.0j, 3.0]})
+        result = df["A"]
+        expected = Series(np.asarray([1.0 + 2.0j, 3.0], np.complex128), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [1.0 + 2.0j, True]})
+        result = df["A"]
+        expected = Series(np.asarray([1.0 + 2.0j, True], np.object_), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [1.0, None]})
+        result = df["A"]
+        expected = Series(np.asarray([1.0, np.nan], np.float64), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [1.0 + 2.0j, None]})
+        result = df["A"]
+        expected = Series(np.asarray([1.0 + 2.0j, np.nan], np.complex128), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [2.0, 1, True, None]})
+        result = df["A"]
+        expected = Series(np.asarray([2.0, 1, True, None], np.object_), name="A")
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"A": [2.0, 1, datetime(2006, 1, 1), None]})
+        result = df["A"]
+        expected = Series(
+            np.asarray([2.0, 1, datetime(2006, 1, 1), None], np.object_), name="A"
+        )
+        tm.assert_series_equal(result, expected)
+
+    def test_construction_with_mixed(self, float_string_frame, using_infer_string):
+        # test construction edge cases with mixed types
+
+        # f7u12, this does not work without extensive workaround
+        data = [
+            [datetime(2001, 1, 5), np.nan, datetime(2001, 1, 2)],
+            [datetime(2000, 1, 2), datetime(2000, 1, 3), datetime(2000, 1, 1)],
+        ]
+        df = DataFrame(data)
+
+        # check dtypes
+        result = df.dtypes
+        expected = Series({"datetime64[us]": 3})
+
+        # mixed-type frames
+        float_string_frame["datetime"] = datetime.now()
+        float_string_frame["timedelta"] = timedelta(days=1, seconds=1)
+        assert float_string_frame["datetime"].dtype == "M8[us]"
+        assert float_string_frame["timedelta"].dtype == "m8[us]"
+        result = float_string_frame.dtypes
+        expected = Series(
+            [np.dtype("float64")] * 4
+            + [
+                np.dtype("object") if not using_infer_string else "string",
+                np.dtype("datetime64[us]"),
+                np.dtype("timedelta64[us]"),
+            ],
+            index=list("ABCD") + ["foo", "datetime", "timedelta"],
+        )
+        tm.assert_series_equal(result, expected)
+
+    def test_construction_with_conversions(self):
+        # convert from a numpy array of non-ns timedelta64; as of 2.0 this does
+        #  *not* convert
+        arr = np.array([1, 2, 3], dtype="timedelta64[s]")
+        df = DataFrame(index=range(3))
+        df["A"] = arr
+        expected = DataFrame(
+            {"A": pd.timedelta_range("00:00:01", periods=3, freq="s")}, index=range(3)
+        )
+        tm.assert_numpy_array_equal(df["A"].to_numpy(), arr)
+
+        expected = DataFrame(
+            {
+                "dt1": Timestamp("20130101"),
+                "dt2": date_range("20130101", periods=3).astype("M8[s]"),
+                # 'dt3' : date_range('20130101 00:00:01',periods=3,freq='s'),
+                # FIXME: don't leave commented-out
+            },
+            index=range(3),
+        )
+        assert expected.dtypes["dt1"] == "M8[s]"
+        assert expected.dtypes["dt2"] == "M8[s]"
+
+        df = DataFrame(index=range(3))
+        df["dt1"] = np.datetime64("2013-01-01")
+        df["dt2"] = np.array(
+            ["2013-01-01", "2013-01-02", "2013-01-03"], dtype="datetime64[D]"
+        )
+
+        # df['dt3'] = np.array(['2013-01-01 00:00:01','2013-01-01
+        # 00:00:02','2013-01-01 00:00:03'],dtype='datetime64[s]')
+        # FIXME: don't leave commented-out
+
+        tm.assert_frame_equal(df, expected)
+
+    def test_constructor_compound_dtypes(self):
+        # GH 5191
+        # compound dtypes should raise not-implementederror
+
+        def f(dtype):
+            data = list(itertools.repeat((datetime(2001, 1, 1), "aa", 20), 9))
+            return DataFrame(data=data, columns=["A", "B", "C"], dtype=dtype)
+
+        msg = "compound dtypes are not implemented in the DataFrame constructor"
+        with pytest.raises(NotImplementedError, match=msg):
+            f([("A", "datetime64[h]"), ("B", "str"), ("C", "int32")])
+
+        # pre-2.0 these used to work (though results may be unexpected)
+        with pytest.raises(TypeError, match="argument must be"):
+            f("int64")
+        with pytest.raises(TypeError, match="argument must be"):
+            f("float64")
+
+        # 10822
+        msg = "^Unknown datetime string format, unable to parse: aa, at position 0$"
+        with pytest.raises(ValueError, match=msg):
+            f("M8[ns]")
+
+    def test_pickle(self, float_string_frame, timezone_frame):
+        empty_frame = DataFrame()
+
+        unpickled = tm.round_trip_pickle(float_string_frame)
+        tm.assert_frame_equal(float_string_frame, unpickled)
+
+        # buglet
+        float_string_frame._mgr.ndim
+
+        # empty
+        unpickled = tm.round_trip_pickle(empty_frame)
+        repr(unpickled)
+
+        # tz frame
+        unpickled = tm.round_trip_pickle(timezone_frame)
+        tm.assert_frame_equal(timezone_frame, unpickled)
+
+    def test_consolidate_datetime64(self):
+        # numpy vstack bug
+
+        df = DataFrame(
+            {
+                "starting": pd.to_datetime(
+                    [
+                        "2012-06-21 00:00",
+                        "2012-06-23 07:00",
+                        "2012-06-23 16:30",
+                        "2012-06-25 08:00",
+                        "2012-06-26 12:00",
+                    ]
+                ),
+                "ending": pd.to_datetime(
+                    [
+                        "2012-06-23 07:00",
+                        "2012-06-23 16:30",
+                        "2012-06-25 08:00",
+                        "2012-06-26 12:00",
+                        "2012-06-27 08:00",
+                    ]
+                ),
+                "measure": [77, 65, 77, 0, 77],
+            }
+        )
+
+        ser_starting = df.starting
+        ser_starting.index = ser_starting.values
+        ser_starting = ser_starting.tz_localize("US/Eastern")
+        ser_starting = ser_starting.tz_convert("UTC")
+        ser_starting.index.name = "starting"
+
+        ser_ending = df.ending
+        ser_ending.index = ser_ending.values
+        ser_ending = ser_ending.tz_localize("US/Eastern")
+        ser_ending = ser_ending.tz_convert("UTC")
+        ser_ending.index.name = "ending"
+
+        df.starting = ser_starting.index
+        df.ending = ser_ending.index
+
+        tm.assert_index_equal(pd.DatetimeIndex(df.starting), ser_starting.index)
+        tm.assert_index_equal(pd.DatetimeIndex(df.ending), ser_ending.index)
+
+    def test_is_mixed_type(self, float_frame, float_string_frame):
+        assert not float_frame._is_mixed_type
+        assert float_string_frame._is_mixed_type
+
+    def test_stale_cached_series_bug_473(self, using_copy_on_write, warn_copy_on_write):
+        # this is chained, but ok
+        with option_context("chained_assignment", None):
+            Y = DataFrame(
+                np.random.default_rng(2).random((4, 4)),
+                index=("a", "b", "c", "d"),
+                columns=("e", "f", "g", "h"),
+            )
+            repr(Y)
+            Y["e"] = Y["e"].astype("object")
+            with tm.raises_chained_assignment_error():
+                Y["g"]["c"] = np.nan
+            repr(Y)
+            Y.sum()
+            Y["g"].sum()
+            if using_copy_on_write:
+                assert not pd.isna(Y["g"]["c"])
+            else:
+                assert pd.isna(Y["g"]["c"])
+
+    @pytest.mark.filterwarnings("ignore:Setting a value on a view:FutureWarning")
+    def test_strange_column_corruption_issue(self, using_copy_on_write):
+        # TODO(wesm): Unclear how exactly this is related to internal matters
+        df = DataFrame(index=[0, 1])
+        df[0] = np.nan
+        wasCol = {}
+
+        with tm.assert_produces_warning(
+            PerformanceWarning, raise_on_extra_warnings=False
+        ):
+            for i, dt in enumerate(df.index):
+                for col in range(100, 200):
+                    if col not in wasCol:
+                        wasCol[col] = 1
+                        df[col] = np.nan
+                    if using_copy_on_write:
+                        df.loc[dt, col] = i
+                    else:
+                        df[col][dt] = i
+
+        myid = 100
+
+        first = len(df.loc[pd.isna(df[myid]), [myid]])
+        second = len(df.loc[pd.isna(df[myid]), [myid]])
+        assert first == second == 0
+
+    def test_constructor_no_pandas_array(self):
+        # Ensure that NumpyExtensionArray isn't allowed inside Series
+        # See https://github.com/pandas-dev/pandas/issues/23995 for more.
+        arr = Series([1, 2, 3]).array
+        result = DataFrame({"A": arr})
+        expected = DataFrame({"A": [1, 2, 3]})
+        tm.assert_frame_equal(result, expected)
+        assert isinstance(result._mgr.blocks[0], NumpyBlock)
+        assert result._mgr.blocks[0].is_numeric
+
+    def test_add_column_with_pandas_array(self):
+        # GH 26390
+        df = DataFrame({"a": [1, 2, 3, 4], "b": ["a", "b", "c", "d"]})
+        df["c"] = pd.arrays.NumpyExtensionArray(np.array([1, 2, None, 3], dtype=object))
+        df2 = DataFrame(
+            {
+                "a": [1, 2, 3, 4],
+                "b": ["a", "b", "c", "d"],
+                "c": pd.arrays.NumpyExtensionArray(
+                    np.array([1, 2, None, 3], dtype=object)
+                ),
+            }
+        )
+        assert type(df["c"]._mgr.blocks[0]) == NumpyBlock
+        assert df["c"]._mgr.blocks[0].is_object
+        assert type(df2["c"]._mgr.blocks[0]) == NumpyBlock
+        assert df2["c"]._mgr.blocks[0].is_object
+        tm.assert_frame_equal(df, df2)
+
+
+def test_update_inplace_sets_valid_block_values(using_copy_on_write):
+    # https://github.com/pandas-dev/pandas/issues/33457
+    df = DataFrame({"a": Series([1, 2, None], dtype="category")})
+
+    # inplace update of a single column
+    if using_copy_on_write:
+        with tm.raises_chained_assignment_error():
+            df["a"].fillna(1, inplace=True)
+    else:
+        with tm.assert_produces_warning(FutureWarning, match="inplace method"):
+            df["a"].fillna(1, inplace=True)
+
+    # check we haven't put a Series into any block.values
+    assert isinstance(df._mgr.blocks[0].values, Categorical)
+
+    if not using_copy_on_write:
+        # smoketest for OP bug from GH#35731
+        assert df.isnull().sum().sum() == 0
+
+
+def test_nonconsolidated_item_cache_take():
+    # https://github.com/pandas-dev/pandas/issues/35521
+
+    # create non-consolidated dataframe with object dtype columns
+    df = DataFrame()
+    df["col1"] = Series(["a"], dtype=object)
+    df["col2"] = Series([0], dtype=object)
+
+    # access column (item cache)
+    df["col1"] == "A"
+    # take operation
+    # (regression was that this consolidated but didn't reset item cache,
+    # resulting in an invalid cache and the .at operation not working properly)
+    df[df["col2"] == 0]
+
+    # now setting value should update actual dataframe
+    df.at[0, "col1"] = "A"
+
+    expected = DataFrame({"col1": ["A"], "col2": [0]}, dtype=object)
+    tm.assert_frame_equal(df, expected)
+    assert df.at[0, "col1"] == "A"

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_cumulative.py

@@ -0,0 +1,81 @@
+"""
+Tests for DataFrame cumulative operations
+
+See also
+--------
+tests.series.test_cumulative
+"""
+
+import numpy as np
+import pytest
+
+from pandas import (
+    DataFrame,
+    Series,
+)
+import pandas._testing as tm
+
+
+class TestDataFrameCumulativeOps:
+    # ---------------------------------------------------------------------
+    # Cumulative Operations - cumsum, cummax, ...
+
+    def test_cumulative_ops_smoke(self):
+        # it works
+        df = DataFrame({"A": np.arange(20)}, index=np.arange(20))
+        df.cummax()
+        df.cummin()
+        df.cumsum()
+
+        dm = DataFrame(np.arange(20).reshape(4, 5), index=range(4), columns=range(5))
+        # TODO(wesm): do something with this?
+        dm.cumsum()
+
+    def test_cumprod_smoke(self, datetime_frame):
+        datetime_frame.iloc[5:10, 0] = np.nan
+        datetime_frame.iloc[10:15, 1] = np.nan
+        datetime_frame.iloc[15:, 2] = np.nan
+
+        # ints
+        df = datetime_frame.fillna(0).astype(int)
+        df.cumprod(0)
+        df.cumprod(1)
+
+        # ints32
+        df = datetime_frame.fillna(0).astype(np.int32)
+        df.cumprod(0)
+        df.cumprod(1)
+
+    @pytest.mark.parametrize("method", ["cumsum", "cumprod", "cummin", "cummax"])
+    def test_cumulative_ops_match_series_apply(self, datetime_frame, method):
+        datetime_frame.iloc[5:10, 0] = np.nan
+        datetime_frame.iloc[10:15, 1] = np.nan
+        datetime_frame.iloc[15:, 2] = np.nan
+
+        # axis = 0
+        result = getattr(datetime_frame, method)()
+        expected = datetime_frame.apply(getattr(Series, method))
+        tm.assert_frame_equal(result, expected)
+
+        # axis = 1
+        result = getattr(datetime_frame, method)(axis=1)
+        expected = datetime_frame.apply(getattr(Series, method), axis=1)
+        tm.assert_frame_equal(result, expected)
+
+        # fix issue TODO: GH ref?
+        assert np.shape(result) == np.shape(datetime_frame)
+
+    def test_cumsum_preserve_dtypes(self):
+        # GH#19296 dont incorrectly upcast to object
+        df = DataFrame({"A": [1, 2, 3], "B": [1, 2, 3.0], "C": [True, False, False]})
+
+        result = df.cumsum()
+
+        expected = DataFrame(
+            {
+                "A": Series([1, 3, 6], dtype=np.int64),
+                "B": Series([1, 3, 6], dtype=np.float64),
+                "C": df["C"].cumsum(),
+            }
+        )
+        tm.assert_frame_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_iteration.py

@@ -0,0 +1,160 @@
+import datetime
+
+import numpy as np
+import pytest
+
+from pandas.compat import (
+    IS64,
+    is_platform_windows,
+)
+
+from pandas import (
+    Categorical,
+    DataFrame,
+    Series,
+    date_range,
+)
+import pandas._testing as tm
+
+
+class TestIteration:
+    def test_keys(self, float_frame):
+        assert float_frame.keys() is float_frame.columns
+
+    def test_iteritems(self):
+        df = DataFrame([[1, 2, 3], [4, 5, 6]], columns=["a", "a", "b"])
+        for k, v in df.items():
+            assert isinstance(v, DataFrame._constructor_sliced)
+
+    def test_items(self):
+        # GH#17213, GH#13918
+        cols = ["a", "b", "c"]
+        df = DataFrame([[1, 2, 3], [4, 5, 6]], columns=cols)
+        for c, (k, v) in zip(cols, df.items()):
+            assert c == k
+            assert isinstance(v, Series)
+            assert (df[k] == v).all()
+
+    def test_items_names(self, float_string_frame):
+        for k, v in float_string_frame.items():
+            assert v.name == k
+
+    def test_iter(self, float_frame):
+        assert list(float_frame) == list(float_frame.columns)
+
+    def test_iterrows(self, float_frame, float_string_frame):
+        for k, v in float_frame.iterrows():
+            exp = float_frame.loc[k]
+            tm.assert_series_equal(v, exp)
+
+        for k, v in float_string_frame.iterrows():
+            exp = float_string_frame.loc[k]
+            tm.assert_series_equal(v, exp)
+
+    def test_iterrows_iso8601(self):
+        # GH#19671
+        s = DataFrame(
+            {
+                "non_iso8601": ["M1701", "M1802", "M1903", "M2004"],
+                "iso8601": date_range("2000-01-01", periods=4, freq="ME"),
+            }
+        )
+        for k, v in s.iterrows():
+            exp = s.loc[k]
+            tm.assert_series_equal(v, exp)
+
+    def test_iterrows_corner(self):
+        # GH#12222
+        df = DataFrame(
+            {
+                "a": [datetime.datetime(2015, 1, 1)],
+                "b": [None],
+                "c": [None],
+                "d": [""],
+                "e": [[]],
+                "f": [set()],
+                "g": [{}],
+            }
+        )
+        expected = Series(
+            [datetime.datetime(2015, 1, 1), None, None, "", [], set(), {}],
+            index=list("abcdefg"),
+            name=0,
+            dtype="object",
+        )
+        _, result = next(df.iterrows())
+        tm.assert_series_equal(result, expected)
+
+    def test_itertuples(self, float_frame):
+        for i, tup in enumerate(float_frame.itertuples()):
+            ser = DataFrame._constructor_sliced(tup[1:])
+            ser.name = tup[0]
+            expected = float_frame.iloc[i, :].reset_index(drop=True)
+            tm.assert_series_equal(ser, expected)
+
+    def test_itertuples_index_false(self):
+        df = DataFrame(
+            {"floats": np.random.default_rng(2).standard_normal(5), "ints": range(5)},
+            columns=["floats", "ints"],
+        )
+
+        for tup in df.itertuples(index=False):
+            assert isinstance(tup[1], int)
+
+    def test_itertuples_duplicate_cols(self):
+        df = DataFrame(data={"a": [1, 2, 3], "b": [4, 5, 6]})
+        dfaa = df[["a", "a"]]
+
+        assert list(dfaa.itertuples()) == [(0, 1, 1), (1, 2, 2), (2, 3, 3)]
+
+        # repr with int on 32-bit/windows
+        if not (is_platform_windows() or not IS64):
+            assert (
+                repr(list(df.itertuples(name=None)))
+                == "[(0, 1, 4), (1, 2, 5), (2, 3, 6)]"
+            )
+
+    def test_itertuples_tuple_name(self):
+        df = DataFrame(data={"a": [1, 2, 3], "b": [4, 5, 6]})
+        tup = next(df.itertuples(name="TestName"))
+        assert tup._fields == ("Index", "a", "b")
+        assert (tup.Index, tup.a, tup.b) == tup
+        assert type(tup).__name__ == "TestName"
+
+    def test_itertuples_disallowed_col_labels(self):
+        df = DataFrame(data={"def": [1, 2, 3], "return": [4, 5, 6]})
+        tup2 = next(df.itertuples(name="TestName"))
+        assert tup2 == (0, 1, 4)
+        assert tup2._fields == ("Index", "_1", "_2")
+
+    @pytest.mark.parametrize("limit", [254, 255, 1024])
+    @pytest.mark.parametrize("index", [True, False])
+    def test_itertuples_py2_3_field_limit_namedtuple(self, limit, index):
+        # GH#28282
+        df = DataFrame([{f"foo_{i}": f"bar_{i}" for i in range(limit)}])
+        result = next(df.itertuples(index=index))
+        assert isinstance(result, tuple)
+        assert hasattr(result, "_fields")
+
+    def test_sequence_like_with_categorical(self):
+        # GH#7839
+        # make sure can iterate
+        df = DataFrame(
+            {"id": [1, 2, 3, 4, 5, 6], "raw_grade": ["a", "b", "b", "a", "a", "e"]}
+        )
+        df["grade"] = Categorical(df["raw_grade"])
+
+        # basic sequencing testing
+        result = list(df.grade.values)
+        expected = np.array(df.grade.values).tolist()
+        tm.assert_almost_equal(result, expected)
+
+        # iteration
+        for t in df.itertuples(index=False):
+            str(t)
+
+        for row, s in df.iterrows():
+            str(s)
+
+        for c, col in df.items():
+            str(col)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_logical_ops.py

@@ -0,0 +1,218 @@
+import operator
+import re
+
+import numpy as np
+import pytest
+
+from pandas import (
+    CategoricalIndex,
+    DataFrame,
+    Interval,
+    Series,
+    isnull,
+)
+import pandas._testing as tm
+
+
+class TestDataFrameLogicalOperators:
+    # &, |, ^
+
+    @pytest.mark.parametrize(
+        "left, right, op, expected",
+        [
+            (
+                [True, False, np.nan],
+                [True, False, True],
+                operator.and_,
+                [True, False, False],
+            ),
+            (
+                [True, False, True],
+                [True, False, np.nan],
+                operator.and_,
+                [True, False, False],
+            ),
+            (
+                [True, False, np.nan],
+                [True, False, True],
+                operator.or_,
+                [True, False, False],
+            ),
+            (
+                [True, False, True],
+                [True, False, np.nan],
+                operator.or_,
+                [True, False, True],
+            ),
+        ],
+    )
+    def test_logical_operators_nans(self, left, right, op, expected, frame_or_series):
+        # GH#13896
+        result = op(frame_or_series(left), frame_or_series(right))
+        expected = frame_or_series(expected)
+
+        tm.assert_equal(result, expected)
+
+    def test_logical_ops_empty_frame(self):
+        # GH#5808
+        # empty frames, non-mixed dtype
+        df = DataFrame(index=[1])
+
+        result = df & df
+        tm.assert_frame_equal(result, df)
+
+        result = df | df
+        tm.assert_frame_equal(result, df)
+
+        df2 = DataFrame(index=[1, 2])
+        result = df & df2
+        tm.assert_frame_equal(result, df2)
+
+        dfa = DataFrame(index=[1], columns=["A"])
+
+        result = dfa & dfa
+        expected = DataFrame(False, index=[1], columns=["A"])
+        tm.assert_frame_equal(result, expected)
+
+    def test_logical_ops_bool_frame(self):
+        # GH#5808
+        df1a_bool = DataFrame(True, index=[1], columns=["A"])
+
+        result = df1a_bool & df1a_bool
+        tm.assert_frame_equal(result, df1a_bool)
+
+        result = df1a_bool | df1a_bool
+        tm.assert_frame_equal(result, df1a_bool)
+
+    def test_logical_ops_int_frame(self):
+        # GH#5808
+        df1a_int = DataFrame(1, index=[1], columns=["A"])
+        df1a_bool = DataFrame(True, index=[1], columns=["A"])
+
+        result = df1a_int | df1a_bool
+        tm.assert_frame_equal(result, df1a_bool)
+
+        # Check that this matches Series behavior
+        res_ser = df1a_int["A"] | df1a_bool["A"]
+        tm.assert_series_equal(res_ser, df1a_bool["A"])
+
+    def test_logical_ops_invalid(self, using_infer_string):
+        # GH#5808
+
+        df1 = DataFrame(1.0, index=[1], columns=["A"])
+        df2 = DataFrame(True, index=[1], columns=["A"])
+        msg = re.escape("unsupported operand type(s) for |: 'float' and 'bool'")
+        with pytest.raises(TypeError, match=msg):
+            df1 | df2
+
+        df1 = DataFrame("foo", index=[1], columns=["A"])
+        df2 = DataFrame(True, index=[1], columns=["A"])
+        msg = re.escape("unsupported operand type(s) for |: 'str' and 'bool'")
+        if using_infer_string:
+            import pyarrow as pa
+
+            with pytest.raises(pa.lib.ArrowNotImplementedError, match="|has no kernel"):
+                df1 | df2
+        else:
+            with pytest.raises(TypeError, match=msg):
+                df1 | df2
+
+    def test_logical_operators(self):
+        def _check_bin_op(op):
+            result = op(df1, df2)
+            expected = DataFrame(
+                op(df1.values, df2.values), index=df1.index, columns=df1.columns
+            )
+            assert result.values.dtype == np.bool_
+            tm.assert_frame_equal(result, expected)
+
+        def _check_unary_op(op):
+            result = op(df1)
+            expected = DataFrame(op(df1.values), index=df1.index, columns=df1.columns)
+            assert result.values.dtype == np.bool_
+            tm.assert_frame_equal(result, expected)
+
+        df1 = {
+            "a": {"a": True, "b": False, "c": False, "d": True, "e": True},
+            "b": {"a": False, "b": True, "c": False, "d": False, "e": False},
+            "c": {"a": False, "b": False, "c": True, "d": False, "e": False},
+            "d": {"a": True, "b": False, "c": False, "d": True, "e": True},
+            "e": {"a": True, "b": False, "c": False, "d": True, "e": True},
+        }
+
+        df2 = {
+            "a": {"a": True, "b": False, "c": True, "d": False, "e": False},
+            "b": {"a": False, "b": True, "c": False, "d": False, "e": False},
+            "c": {"a": True, "b": False, "c": True, "d": False, "e": False},
+            "d": {"a": False, "b": False, "c": False, "d": True, "e": False},
+            "e": {"a": False, "b": False, "c": False, "d": False, "e": True},
+        }
+
+        df1 = DataFrame(df1)
+        df2 = DataFrame(df2)
+
+        _check_bin_op(operator.and_)
+        _check_bin_op(operator.or_)
+        _check_bin_op(operator.xor)
+
+        _check_unary_op(operator.inv)  # TODO: belongs elsewhere
+
+    @pytest.mark.filterwarnings("ignore:Downcasting object dtype arrays:FutureWarning")
+    def test_logical_with_nas(self):
+        d = DataFrame({"a": [np.nan, False], "b": [True, True]})
+
+        # GH4947
+        # bool comparisons should return bool
+        result = d["a"] | d["b"]
+        expected = Series([False, True])
+        tm.assert_series_equal(result, expected)
+
+        # GH4604, automatic casting here
+        result = d["a"].fillna(False) | d["b"]
+        expected = Series([True, True])
+        tm.assert_series_equal(result, expected)
+
+        msg = "The 'downcast' keyword in fillna is deprecated"
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            result = d["a"].fillna(False, downcast=False) | d["b"]
+        expected = Series([True, True])
+        tm.assert_series_equal(result, expected)
+
+    def test_logical_ops_categorical_columns(self):
+        # GH#38367
+        intervals = [Interval(1, 2), Interval(3, 4)]
+        data = DataFrame(
+            [[1, np.nan], [2, np.nan]],
+            columns=CategoricalIndex(
+                intervals, categories=intervals + [Interval(5, 6)]
+            ),
+        )
+        mask = DataFrame(
+            [[False, False], [False, False]], columns=data.columns, dtype=bool
+        )
+        result = mask | isnull(data)
+        expected = DataFrame(
+            [[False, True], [False, True]],
+            columns=CategoricalIndex(
+                intervals, categories=intervals + [Interval(5, 6)]
+            ),
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_int_dtype_different_index_not_bool(self):
+        # GH 52500
+        df1 = DataFrame([1, 2, 3], index=[10, 11, 23], columns=["a"])
+        df2 = DataFrame([10, 20, 30], index=[11, 10, 23], columns=["a"])
+        result = np.bitwise_xor(df1, df2)
+        expected = DataFrame([21, 8, 29], index=[10, 11, 23], columns=["a"])
+        tm.assert_frame_equal(result, expected)
+
+        result = df1 ^ df2
+        tm.assert_frame_equal(result, expected)
+
+    def test_different_dtypes_different_index_raises(self):
+        # GH 52538
+        df1 = DataFrame([1, 2], index=["a", "b"])
+        df2 = DataFrame([3, 4], index=["b", "c"])
+        with pytest.raises(TypeError, match="unsupported operand type"):
+            df1 & df2

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_nonunique_indexes.py

@@ -0,0 +1,337 @@
+import numpy as np
+import pytest
+
+import pandas as pd
+from pandas import (
+    DataFrame,
+    Series,
+    date_range,
+)
+import pandas._testing as tm
+
+
+class TestDataFrameNonuniqueIndexes:
+    def test_setattr_columns_vs_construct_with_columns(self):
+        # assignment
+        # GH 3687
+        arr = np.random.default_rng(2).standard_normal((3, 2))
+        idx = list(range(2))
+        df = DataFrame(arr, columns=["A", "A"])
+        df.columns = idx
+        expected = DataFrame(arr, columns=idx)
+        tm.assert_frame_equal(df, expected)
+
+    def test_setattr_columns_vs_construct_with_columns_datetimeindx(self):
+        idx = date_range("20130101", periods=4, freq="QE-NOV")
+        df = DataFrame(
+            [[1, 1, 1, 5], [1, 1, 2, 5], [2, 1, 3, 5]], columns=["a", "a", "a", "a"]
+        )
+        df.columns = idx
+        expected = DataFrame([[1, 1, 1, 5], [1, 1, 2, 5], [2, 1, 3, 5]], columns=idx)
+        tm.assert_frame_equal(df, expected)
+
+    def test_insert_with_duplicate_columns(self):
+        # insert
+        df = DataFrame(
+            [[1, 1, 1, 5], [1, 1, 2, 5], [2, 1, 3, 5]],
+            columns=["foo", "bar", "foo", "hello"],
+        )
+        df["string"] = "bah"
+        expected = DataFrame(
+            [[1, 1, 1, 5, "bah"], [1, 1, 2, 5, "bah"], [2, 1, 3, 5, "bah"]],
+            columns=["foo", "bar", "foo", "hello", "string"],
+        )
+        tm.assert_frame_equal(df, expected)
+        with pytest.raises(ValueError, match="Length of value"):
+            df.insert(0, "AnotherColumn", range(len(df.index) - 1))
+
+        # insert same dtype
+        df["foo2"] = 3
+        expected = DataFrame(
+            [[1, 1, 1, 5, "bah", 3], [1, 1, 2, 5, "bah", 3], [2, 1, 3, 5, "bah", 3]],
+            columns=["foo", "bar", "foo", "hello", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        # set (non-dup)
+        df["foo2"] = 4
+        expected = DataFrame(
+            [[1, 1, 1, 5, "bah", 4], [1, 1, 2, 5, "bah", 4], [2, 1, 3, 5, "bah", 4]],
+            columns=["foo", "bar", "foo", "hello", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+        df["foo2"] = 3
+
+        # delete (non dup)
+        del df["bar"]
+        expected = DataFrame(
+            [[1, 1, 5, "bah", 3], [1, 2, 5, "bah", 3], [2, 3, 5, "bah", 3]],
+            columns=["foo", "foo", "hello", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        # try to delete again (its not consolidated)
+        del df["hello"]
+        expected = DataFrame(
+            [[1, 1, "bah", 3], [1, 2, "bah", 3], [2, 3, "bah", 3]],
+            columns=["foo", "foo", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        # consolidate
+        df = df._consolidate()
+        expected = DataFrame(
+            [[1, 1, "bah", 3], [1, 2, "bah", 3], [2, 3, "bah", 3]],
+            columns=["foo", "foo", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        # insert
+        df.insert(2, "new_col", 5.0)
+        expected = DataFrame(
+            [[1, 1, 5.0, "bah", 3], [1, 2, 5.0, "bah", 3], [2, 3, 5.0, "bah", 3]],
+            columns=["foo", "foo", "new_col", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        # insert a dup
+        with pytest.raises(ValueError, match="cannot insert"):
+            df.insert(2, "new_col", 4.0)
+
+        df.insert(2, "new_col", 4.0, allow_duplicates=True)
+        expected = DataFrame(
+            [
+                [1, 1, 4.0, 5.0, "bah", 3],
+                [1, 2, 4.0, 5.0, "bah", 3],
+                [2, 3, 4.0, 5.0, "bah", 3],
+            ],
+            columns=["foo", "foo", "new_col", "new_col", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        # delete (dup)
+        del df["foo"]
+        expected = DataFrame(
+            [[4.0, 5.0, "bah", 3], [4.0, 5.0, "bah", 3], [4.0, 5.0, "bah", 3]],
+            columns=["new_col", "new_col", "string", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+    def test_dup_across_dtypes(self):
+        # dup across dtypes
+        df = DataFrame(
+            [[1, 1, 1.0, 5], [1, 1, 2.0, 5], [2, 1, 3.0, 5]],
+            columns=["foo", "bar", "foo", "hello"],
+        )
+
+        df["foo2"] = 7.0
+        expected = DataFrame(
+            [[1, 1, 1.0, 5, 7.0], [1, 1, 2.0, 5, 7.0], [2, 1, 3.0, 5, 7.0]],
+            columns=["foo", "bar", "foo", "hello", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        result = df["foo"]
+        expected = DataFrame([[1, 1.0], [1, 2.0], [2, 3.0]], columns=["foo", "foo"])
+        tm.assert_frame_equal(result, expected)
+
+        # multiple replacements
+        df["foo"] = "string"
+        expected = DataFrame(
+            [
+                ["string", 1, "string", 5, 7.0],
+                ["string", 1, "string", 5, 7.0],
+                ["string", 1, "string", 5, 7.0],
+            ],
+            columns=["foo", "bar", "foo", "hello", "foo2"],
+        )
+        tm.assert_frame_equal(df, expected)
+
+        del df["foo"]
+        expected = DataFrame(
+            [[1, 5, 7.0], [1, 5, 7.0], [1, 5, 7.0]], columns=["bar", "hello", "foo2"]
+        )
+        tm.assert_frame_equal(df, expected)
+
+    def test_column_dups_indexes(self):
+        # check column dups with index equal and not equal to df's index
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((5, 3)),
+            index=["a", "b", "c", "d", "e"],
+            columns=["A", "B", "A"],
+        )
+        for index in [df.index, pd.Index(list("edcba"))]:
+            this_df = df.copy()
+            expected_ser = Series(index.values, index=this_df.index)
+            expected_df = DataFrame(
+                {"A": expected_ser, "B": this_df["B"]},
+                columns=["A", "B", "A"],
+            )
+            this_df["A"] = index
+            tm.assert_frame_equal(this_df, expected_df)
+
+    def test_changing_dtypes_with_duplicate_columns(self):
+        # multiple assignments that change dtypes
+        # the location indexer is a slice
+        # GH 6120
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((5, 2)), columns=["that", "that"]
+        )
+        expected = DataFrame(1.0, index=range(5), columns=["that", "that"])
+
+        df["that"] = 1.0
+        tm.assert_frame_equal(df, expected)
+
+        df = DataFrame(
+            np.random.default_rng(2).random((5, 2)), columns=["that", "that"]
+        )
+        expected = DataFrame(1, index=range(5), columns=["that", "that"])
+
+        df["that"] = 1
+        tm.assert_frame_equal(df, expected)
+
+    def test_dup_columns_comparisons(self):
+        # equality
+        df1 = DataFrame([[1, 2], [2, np.nan], [3, 4], [4, 4]], columns=["A", "B"])
+        df2 = DataFrame([[0, 1], [2, 4], [2, np.nan], [4, 5]], columns=["A", "A"])
+
+        # not-comparing like-labelled
+        msg = (
+            r"Can only compare identically-labeled \(both index and columns\) "
+            "DataFrame objects"
+        )
+        with pytest.raises(ValueError, match=msg):
+            df1 == df2
+
+        df1r = df1.reindex_like(df2)
+        result = df1r == df2
+        expected = DataFrame(
+            [[False, True], [True, False], [False, False], [True, False]],
+            columns=["A", "A"],
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_mixed_column_selection(self):
+        # mixed column selection
+        # GH 5639
+        dfbool = DataFrame(
+            {
+                "one": Series([True, True, False], index=["a", "b", "c"]),
+                "two": Series([False, False, True, False], index=["a", "b", "c", "d"]),
+                "three": Series([False, True, True, True], index=["a", "b", "c", "d"]),
+            }
+        )
+        expected = pd.concat([dfbool["one"], dfbool["three"], dfbool["one"]], axis=1)
+        result = dfbool[["one", "three", "one"]]
+        tm.assert_frame_equal(result, expected)
+
+    def test_multi_axis_dups(self):
+        # multi-axis dups
+        # GH 6121
+        df = DataFrame(
+            np.arange(25.0).reshape(5, 5),
+            index=["a", "b", "c", "d", "e"],
+            columns=["A", "B", "C", "D", "E"],
+        )
+        z = df[["A", "C", "A"]].copy()
+        expected = z.loc[["a", "c", "a"]]
+
+        df = DataFrame(
+            np.arange(25.0).reshape(5, 5),
+            index=["a", "b", "c", "d", "e"],
+            columns=["A", "B", "C", "D", "E"],
+        )
+        z = df[["A", "C", "A"]]
+        result = z.loc[["a", "c", "a"]]
+        tm.assert_frame_equal(result, expected)
+
+    def test_columns_with_dups(self):
+        # GH 3468 related
+
+        # basic
+        df = DataFrame([[1, 2]], columns=["a", "a"])
+        df.columns = ["a", "a.1"]
+        expected = DataFrame([[1, 2]], columns=["a", "a.1"])
+        tm.assert_frame_equal(df, expected)
+
+        df = DataFrame([[1, 2, 3]], columns=["b", "a", "a"])
+        df.columns = ["b", "a", "a.1"]
+        expected = DataFrame([[1, 2, 3]], columns=["b", "a", "a.1"])
+        tm.assert_frame_equal(df, expected)
+
+    def test_columns_with_dup_index(self):
+        # with a dup index
+        df = DataFrame([[1, 2]], columns=["a", "a"])
+        df.columns = ["b", "b"]
+        expected = DataFrame([[1, 2]], columns=["b", "b"])
+        tm.assert_frame_equal(df, expected)
+
+    def test_multi_dtype(self):
+        # multi-dtype
+        df = DataFrame(
+            [[1, 2, 1.0, 2.0, 3.0, "foo", "bar"]],
+            columns=["a", "a", "b", "b", "d", "c", "c"],
+        )
+        df.columns = list("ABCDEFG")
+        expected = DataFrame(
+            [[1, 2, 1.0, 2.0, 3.0, "foo", "bar"]], columns=list("ABCDEFG")
+        )
+        tm.assert_frame_equal(df, expected)
+
+    def test_multi_dtype2(self):
+        df = DataFrame([[1, 2, "foo", "bar"]], columns=["a", "a", "a", "a"])
+        df.columns = ["a", "a.1", "a.2", "a.3"]
+        expected = DataFrame([[1, 2, "foo", "bar"]], columns=["a", "a.1", "a.2", "a.3"])
+        tm.assert_frame_equal(df, expected)
+
+    def test_dups_across_blocks(self, using_array_manager):
+        # dups across blocks
+        df_float = DataFrame(
+            np.random.default_rng(2).standard_normal((10, 3)), dtype="float64"
+        )
+        df_int = DataFrame(
+            np.random.default_rng(2).standard_normal((10, 3)).astype("int64")
+        )
+        df_bool = DataFrame(True, index=df_float.index, columns=df_float.columns)
+        df_object = DataFrame("foo", index=df_float.index, columns=df_float.columns)
+        df_dt = DataFrame(
+            pd.Timestamp("20010101"), index=df_float.index, columns=df_float.columns
+        )
+        df = pd.concat([df_float, df_int, df_bool, df_object, df_dt], axis=1)
+
+        if not using_array_manager:
+            assert len(df._mgr.blknos) == len(df.columns)
+            assert len(df._mgr.blklocs) == len(df.columns)
+
+        # testing iloc
+        for i in range(len(df.columns)):
+            df.iloc[:, i]
+
+    def test_dup_columns_across_dtype(self):
+        # dup columns across dtype GH 2079/2194
+        vals = [[1, -1, 2.0], [2, -2, 3.0]]
+        rs = DataFrame(vals, columns=["A", "A", "B"])
+        xp = DataFrame(vals)
+        xp.columns = ["A", "A", "B"]
+        tm.assert_frame_equal(rs, xp)
+
+    def test_set_value_by_index(self):
+        # See gh-12344
+        warn = None
+        msg = "will attempt to set the values inplace"
+
+        df = DataFrame(np.arange(9).reshape(3, 3).T)
+        df.columns = list("AAA")
+        expected = df.iloc[:, 2].copy()
+
+        with tm.assert_produces_warning(warn, match=msg):
+            df.iloc[:, 0] = 3
+        tm.assert_series_equal(df.iloc[:, 2], expected)
+
+        df = DataFrame(np.arange(9).reshape(3, 3).T)
+        df.columns = [2, float(2), str(2)]
+        expected = df.iloc[:, 1].copy()
+
+        with tm.assert_produces_warning(warn, match=msg):
+            df.iloc[:, 0] = 3
+        tm.assert_series_equal(df.iloc[:, 1], expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_npfuncs.py

@@ -0,0 +1,89 @@
+"""
+Tests for np.foo applied to DataFrame, not necessarily ufuncs.
+"""
+import numpy as np
+
+from pandas import (
+    Categorical,
+    DataFrame,
+)
+import pandas._testing as tm
+
+
+class TestAsArray:
+    def test_asarray_homogeneous(self):
+        df = DataFrame({"A": Categorical([1, 2]), "B": Categorical([1, 2])})
+        result = np.asarray(df)
+        # may change from object in the future
+        expected = np.array([[1, 1], [2, 2]], dtype="object")
+        tm.assert_numpy_array_equal(result, expected)
+
+    def test_np_sqrt(self, float_frame):
+        with np.errstate(all="ignore"):
+            result = np.sqrt(float_frame)
+        assert isinstance(result, type(float_frame))
+        assert result.index.is_(float_frame.index)
+        assert result.columns.is_(float_frame.columns)
+
+        tm.assert_frame_equal(result, float_frame.apply(np.sqrt))
+
+    def test_sum_deprecated_axis_behavior(self):
+        # GH#52042 deprecated behavior of df.sum(axis=None), which gets
+        #  called when we do np.sum(df)
+
+        arr = np.random.default_rng(2).standard_normal((4, 3))
+        df = DataFrame(arr)
+
+        msg = "The behavior of DataFrame.sum with axis=None is deprecated"
+        with tm.assert_produces_warning(
+            FutureWarning, match=msg, check_stacklevel=False
+        ):
+            res = np.sum(df)
+
+        with tm.assert_produces_warning(FutureWarning, match=msg):
+            expected = df.sum(axis=None)
+        tm.assert_series_equal(res, expected)
+
+    def test_np_ravel(self):
+        # GH26247
+        arr = np.array(
+            [
+                [0.11197053, 0.44361564, -0.92589452],
+                [0.05883648, -0.00948922, -0.26469934],
+            ]
+        )
+
+        result = np.ravel([DataFrame(batch.reshape(1, 3)) for batch in arr])
+        expected = np.array(
+            [
+                0.11197053,
+                0.44361564,
+                -0.92589452,
+                0.05883648,
+                -0.00948922,
+                -0.26469934,
+            ]
+        )
+        tm.assert_numpy_array_equal(result, expected)
+
+        result = np.ravel(DataFrame(arr[0].reshape(1, 3), columns=["x1", "x2", "x3"]))
+        expected = np.array([0.11197053, 0.44361564, -0.92589452])
+        tm.assert_numpy_array_equal(result, expected)
+
+        result = np.ravel(
+            [
+                DataFrame(batch.reshape(1, 3), columns=["x1", "x2", "x3"])
+                for batch in arr
+            ]
+        )
+        expected = np.array(
+            [
+                0.11197053,
+                0.44361564,
+                -0.92589452,
+                0.05883648,
+                -0.00948922,
+                -0.26469934,
+            ]
+        )
+        tm.assert_numpy_array_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_query_eval.py

@@ -0,0 +1,1425 @@
+import operator
+
+import numpy as np
+import pytest
+
+from pandas.errors import (
+    NumExprClobberingError,
+    UndefinedVariableError,
+)
+import pandas.util._test_decorators as td
+
+import pandas as pd
+from pandas import (
+    DataFrame,
+    Index,
+    MultiIndex,
+    Series,
+    date_range,
+)
+import pandas._testing as tm
+from pandas.core.computation.check import NUMEXPR_INSTALLED
+
+
+@pytest.fixture(params=["python", "pandas"], ids=lambda x: x)
+def parser(request):
+    return request.param
+
+
+@pytest.fixture(
+    params=["python", pytest.param("numexpr", marks=td.skip_if_no("numexpr"))],
+    ids=lambda x: x,
+)
+def engine(request):
+    return request.param
+
+
+def skip_if_no_pandas_parser(parser):
+    if parser != "pandas":
+        pytest.skip(f"cannot evaluate with parser={parser}")
+
+
+class TestCompat:
+    @pytest.fixture
+    def df(self):
+        return DataFrame({"A": [1, 2, 3]})
+
+    @pytest.fixture
+    def expected1(self, df):
+        return df[df.A > 0]
+
+    @pytest.fixture
+    def expected2(self, df):
+        return df.A + 1
+
+    def test_query_default(self, df, expected1, expected2):
+        # GH 12749
+        # this should always work, whether NUMEXPR_INSTALLED or not
+        result = df.query("A>0")
+        tm.assert_frame_equal(result, expected1)
+        result = df.eval("A+1")
+        tm.assert_series_equal(result, expected2, check_names=False)
+
+    def test_query_None(self, df, expected1, expected2):
+        result = df.query("A>0", engine=None)
+        tm.assert_frame_equal(result, expected1)
+        result = df.eval("A+1", engine=None)
+        tm.assert_series_equal(result, expected2, check_names=False)
+
+    def test_query_python(self, df, expected1, expected2):
+        result = df.query("A>0", engine="python")
+        tm.assert_frame_equal(result, expected1)
+        result = df.eval("A+1", engine="python")
+        tm.assert_series_equal(result, expected2, check_names=False)
+
+    def test_query_numexpr(self, df, expected1, expected2):
+        if NUMEXPR_INSTALLED:
+            result = df.query("A>0", engine="numexpr")
+            tm.assert_frame_equal(result, expected1)
+            result = df.eval("A+1", engine="numexpr")
+            tm.assert_series_equal(result, expected2, check_names=False)
+        else:
+            msg = (
+                r"'numexpr' is not installed or an unsupported version. "
+                r"Cannot use engine='numexpr' for query/eval if 'numexpr' is "
+                r"not installed"
+            )
+            with pytest.raises(ImportError, match=msg):
+                df.query("A>0", engine="numexpr")
+            with pytest.raises(ImportError, match=msg):
+                df.eval("A+1", engine="numexpr")
+
+
+class TestDataFrameEval:
+    # smaller hits python, larger hits numexpr
+    @pytest.mark.parametrize("n", [4, 4000])
+    @pytest.mark.parametrize(
+        "op_str,op,rop",
+        [
+            ("+", "__add__", "__radd__"),
+            ("-", "__sub__", "__rsub__"),
+            ("*", "__mul__", "__rmul__"),
+            ("/", "__truediv__", "__rtruediv__"),
+        ],
+    )
+    def test_ops(self, op_str, op, rop, n):
+        # tst ops and reversed ops in evaluation
+        # GH7198
+
+        df = DataFrame(1, index=range(n), columns=list("abcd"))
+        df.iloc[0] = 2
+        m = df.mean()
+
+        base = DataFrame(  # noqa: F841
+            np.tile(m.values, n).reshape(n, -1), columns=list("abcd")
+        )
+
+        expected = eval(f"base {op_str} df")
+
+        # ops as strings
+        result = eval(f"m {op_str} df")
+        tm.assert_frame_equal(result, expected)
+
+        # these are commutative
+        if op in ["+", "*"]:
+            result = getattr(df, op)(m)
+            tm.assert_frame_equal(result, expected)
+
+        # these are not
+        elif op in ["-", "/"]:
+            result = getattr(df, rop)(m)
+            tm.assert_frame_equal(result, expected)
+
+    def test_dataframe_sub_numexpr_path(self):
+        # GH7192: Note we need a large number of rows to ensure this
+        #  goes through the numexpr path
+        df = DataFrame({"A": np.random.default_rng(2).standard_normal(25000)})
+        df.iloc[0:5] = np.nan
+        expected = 1 - np.isnan(df.iloc[0:25])
+        result = (1 - np.isnan(df)).iloc[0:25]
+        tm.assert_frame_equal(result, expected)
+
+    def test_query_non_str(self):
+        # GH 11485
+        df = DataFrame({"A": [1, 2, 3], "B": ["a", "b", "b"]})
+
+        msg = "expr must be a string to be evaluated"
+        with pytest.raises(ValueError, match=msg):
+            df.query(lambda x: x.B == "b")
+
+        with pytest.raises(ValueError, match=msg):
+            df.query(111)
+
+    def test_query_empty_string(self):
+        # GH 13139
+        df = DataFrame({"A": [1, 2, 3]})
+
+        msg = "expr cannot be an empty string"
+        with pytest.raises(ValueError, match=msg):
+            df.query("")
+
+    def test_eval_resolvers_as_list(self):
+        # GH 14095
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((10, 2)), columns=list("ab")
+        )
+        dict1 = {"a": 1}
+        dict2 = {"b": 2}
+        assert df.eval("a + b", resolvers=[dict1, dict2]) == dict1["a"] + dict2["b"]
+        assert pd.eval("a + b", resolvers=[dict1, dict2]) == dict1["a"] + dict2["b"]
+
+    def test_eval_resolvers_combined(self):
+        # GH 34966
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((10, 2)), columns=list("ab")
+        )
+        dict1 = {"c": 2}
+
+        # Both input and default index/column resolvers should be usable
+        result = df.eval("a + b * c", resolvers=[dict1])
+
+        expected = df["a"] + df["b"] * dict1["c"]
+        tm.assert_series_equal(result, expected)
+
+    def test_eval_object_dtype_binop(self):
+        # GH#24883
+        df = DataFrame({"a1": ["Y", "N"]})
+        res = df.eval("c = ((a1 == 'Y') & True)")
+        expected = DataFrame({"a1": ["Y", "N"], "c": [True, False]})
+        tm.assert_frame_equal(res, expected)
+
+
+class TestDataFrameQueryWithMultiIndex:
+    def test_query_with_named_multiindex(self, parser, engine):
+        skip_if_no_pandas_parser(parser)
+        a = np.random.default_rng(2).choice(["red", "green"], size=10)
+        b = np.random.default_rng(2).choice(["eggs", "ham"], size=10)
+        index = MultiIndex.from_arrays([a, b], names=["color", "food"])
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 2)), index=index)
+        ind = Series(
+            df.index.get_level_values("color").values, index=index, name="color"
+        )
+
+        # equality
+        res1 = df.query('color == "red"', parser=parser, engine=engine)
+        res2 = df.query('"red" == color', parser=parser, engine=engine)
+        exp = df[ind == "red"]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # inequality
+        res1 = df.query('color != "red"', parser=parser, engine=engine)
+        res2 = df.query('"red" != color', parser=parser, engine=engine)
+        exp = df[ind != "red"]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # list equality (really just set membership)
+        res1 = df.query('color == ["red"]', parser=parser, engine=engine)
+        res2 = df.query('["red"] == color', parser=parser, engine=engine)
+        exp = df[ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        res1 = df.query('color != ["red"]', parser=parser, engine=engine)
+        res2 = df.query('["red"] != color', parser=parser, engine=engine)
+        exp = df[~ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # in/not in ops
+        res1 = df.query('["red"] in color', parser=parser, engine=engine)
+        res2 = df.query('"red" in color', parser=parser, engine=engine)
+        exp = df[ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        res1 = df.query('["red"] not in color', parser=parser, engine=engine)
+        res2 = df.query('"red" not in color', parser=parser, engine=engine)
+        exp = df[~ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+    def test_query_with_unnamed_multiindex(self, parser, engine):
+        skip_if_no_pandas_parser(parser)
+        a = np.random.default_rng(2).choice(["red", "green"], size=10)
+        b = np.random.default_rng(2).choice(["eggs", "ham"], size=10)
+        index = MultiIndex.from_arrays([a, b])
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 2)), index=index)
+        ind = Series(df.index.get_level_values(0).values, index=index)
+
+        res1 = df.query('ilevel_0 == "red"', parser=parser, engine=engine)
+        res2 = df.query('"red" == ilevel_0', parser=parser, engine=engine)
+        exp = df[ind == "red"]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # inequality
+        res1 = df.query('ilevel_0 != "red"', parser=parser, engine=engine)
+        res2 = df.query('"red" != ilevel_0', parser=parser, engine=engine)
+        exp = df[ind != "red"]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # list equality (really just set membership)
+        res1 = df.query('ilevel_0 == ["red"]', parser=parser, engine=engine)
+        res2 = df.query('["red"] == ilevel_0', parser=parser, engine=engine)
+        exp = df[ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        res1 = df.query('ilevel_0 != ["red"]', parser=parser, engine=engine)
+        res2 = df.query('["red"] != ilevel_0', parser=parser, engine=engine)
+        exp = df[~ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # in/not in ops
+        res1 = df.query('["red"] in ilevel_0', parser=parser, engine=engine)
+        res2 = df.query('"red" in ilevel_0', parser=parser, engine=engine)
+        exp = df[ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        res1 = df.query('["red"] not in ilevel_0', parser=parser, engine=engine)
+        res2 = df.query('"red" not in ilevel_0', parser=parser, engine=engine)
+        exp = df[~ind.isin(["red"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # ## LEVEL 1
+        ind = Series(df.index.get_level_values(1).values, index=index)
+        res1 = df.query('ilevel_1 == "eggs"', parser=parser, engine=engine)
+        res2 = df.query('"eggs" == ilevel_1', parser=parser, engine=engine)
+        exp = df[ind == "eggs"]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # inequality
+        res1 = df.query('ilevel_1 != "eggs"', parser=parser, engine=engine)
+        res2 = df.query('"eggs" != ilevel_1', parser=parser, engine=engine)
+        exp = df[ind != "eggs"]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # list equality (really just set membership)
+        res1 = df.query('ilevel_1 == ["eggs"]', parser=parser, engine=engine)
+        res2 = df.query('["eggs"] == ilevel_1', parser=parser, engine=engine)
+        exp = df[ind.isin(["eggs"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        res1 = df.query('ilevel_1 != ["eggs"]', parser=parser, engine=engine)
+        res2 = df.query('["eggs"] != ilevel_1', parser=parser, engine=engine)
+        exp = df[~ind.isin(["eggs"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        # in/not in ops
+        res1 = df.query('["eggs"] in ilevel_1', parser=parser, engine=engine)
+        res2 = df.query('"eggs" in ilevel_1', parser=parser, engine=engine)
+        exp = df[ind.isin(["eggs"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+        res1 = df.query('["eggs"] not in ilevel_1', parser=parser, engine=engine)
+        res2 = df.query('"eggs" not in ilevel_1', parser=parser, engine=engine)
+        exp = df[~ind.isin(["eggs"])]
+        tm.assert_frame_equal(res1, exp)
+        tm.assert_frame_equal(res2, exp)
+
+    def test_query_with_partially_named_multiindex(self, parser, engine):
+        skip_if_no_pandas_parser(parser)
+        a = np.random.default_rng(2).choice(["red", "green"], size=10)
+        b = np.arange(10)
+        index = MultiIndex.from_arrays([a, b])
+        index.names = [None, "rating"]
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 2)), index=index)
+        res = df.query("rating == 1", parser=parser, engine=engine)
+        ind = Series(
+            df.index.get_level_values("rating").values, index=index, name="rating"
+        )
+        exp = df[ind == 1]
+        tm.assert_frame_equal(res, exp)
+
+        res = df.query("rating != 1", parser=parser, engine=engine)
+        ind = Series(
+            df.index.get_level_values("rating").values, index=index, name="rating"
+        )
+        exp = df[ind != 1]
+        tm.assert_frame_equal(res, exp)
+
+        res = df.query('ilevel_0 == "red"', parser=parser, engine=engine)
+        ind = Series(df.index.get_level_values(0).values, index=index)
+        exp = df[ind == "red"]
+        tm.assert_frame_equal(res, exp)
+
+        res = df.query('ilevel_0 != "red"', parser=parser, engine=engine)
+        ind = Series(df.index.get_level_values(0).values, index=index)
+        exp = df[ind != "red"]
+        tm.assert_frame_equal(res, exp)
+
+    def test_query_multiindex_get_index_resolvers(self):
+        df = DataFrame(
+            np.ones((10, 3)),
+            index=MultiIndex.from_arrays(
+                [range(10) for _ in range(2)], names=["spam", "eggs"]
+            ),
+        )
+        resolvers = df._get_index_resolvers()
+
+        def to_series(mi, level):
+            level_values = mi.get_level_values(level)
+            s = level_values.to_series()
+            s.index = mi
+            return s
+
+        col_series = df.columns.to_series()
+        expected = {
+            "index": df.index,
+            "columns": col_series,
+            "spam": to_series(df.index, "spam"),
+            "eggs": to_series(df.index, "eggs"),
+            "clevel_0": col_series,
+        }
+        for k, v in resolvers.items():
+            if isinstance(v, Index):
+                assert v.is_(expected[k])
+            elif isinstance(v, Series):
+                tm.assert_series_equal(v, expected[k])
+            else:
+                raise AssertionError("object must be a Series or Index")
+
+
+@td.skip_if_no("numexpr")
+class TestDataFrameQueryNumExprPandas:
+    @pytest.fixture
+    def engine(self):
+        return "numexpr"
+
+    @pytest.fixture
+    def parser(self):
+        return "pandas"
+
+    def test_date_query_with_attribute_access(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=5)
+        df["dates2"] = date_range("1/1/2013", periods=5)
+        df["dates3"] = date_range("1/1/2014", periods=5)
+        res = df.query(
+            "@df.dates1 < 20130101 < @df.dates3", engine=engine, parser=parser
+        )
+        expec = df[(df.dates1 < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_query_no_attribute_access(self, engine, parser):
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=5)
+        df["dates2"] = date_range("1/1/2013", periods=5)
+        df["dates3"] = date_range("1/1/2014", periods=5)
+        res = df.query("dates1 < 20130101 < dates3", engine=engine, parser=parser)
+        expec = df[(df.dates1 < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_query_with_NaT(self, engine, parser):
+        n = 10
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates2"] = date_range("1/1/2013", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        df.loc[np.random.default_rng(2).random(n) > 0.5, "dates1"] = pd.NaT
+        df.loc[np.random.default_rng(2).random(n) > 0.5, "dates3"] = pd.NaT
+        res = df.query("dates1 < 20130101 < dates3", engine=engine, parser=parser)
+        expec = df[(df.dates1 < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_index_query(self, engine, parser):
+        n = 10
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        return_value = df.set_index("dates1", inplace=True, drop=True)
+        assert return_value is None
+        res = df.query("index < 20130101 < dates3", engine=engine, parser=parser)
+        expec = df[(df.index < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_index_query_with_NaT(self, engine, parser):
+        n = 10
+        # Cast to object to avoid implicit cast when setting entry to pd.NaT below
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3))).astype(
+            {0: object}
+        )
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        df.iloc[0, 0] = pd.NaT
+        return_value = df.set_index("dates1", inplace=True, drop=True)
+        assert return_value is None
+        res = df.query("index < 20130101 < dates3", engine=engine, parser=parser)
+        expec = df[(df.index < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_index_query_with_NaT_duplicates(self, engine, parser):
+        n = 10
+        d = {}
+        d["dates1"] = date_range("1/1/2012", periods=n)
+        d["dates3"] = date_range("1/1/2014", periods=n)
+        df = DataFrame(d)
+        df.loc[np.random.default_rng(2).random(n) > 0.5, "dates1"] = pd.NaT
+        return_value = df.set_index("dates1", inplace=True, drop=True)
+        assert return_value is None
+        res = df.query("dates1 < 20130101 < dates3", engine=engine, parser=parser)
+        expec = df[(df.index.to_series() < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_query_with_non_date(self, engine, parser):
+        n = 10
+        df = DataFrame(
+            {"dates": date_range("1/1/2012", periods=n), "nondate": np.arange(n)}
+        )
+
+        result = df.query("dates == nondate", parser=parser, engine=engine)
+        assert len(result) == 0
+
+        result = df.query("dates != nondate", parser=parser, engine=engine)
+        tm.assert_frame_equal(result, df)
+
+        msg = r"Invalid comparison between dtype=datetime64\[ns\] and ndarray"
+        for op in ["<", ">", "<=", ">="]:
+            with pytest.raises(TypeError, match=msg):
+                df.query(f"dates {op} nondate", parser=parser, engine=engine)
+
+    def test_query_syntax_error(self, engine, parser):
+        df = DataFrame({"i": range(10), "+": range(3, 13), "r": range(4, 14)})
+        msg = "invalid syntax"
+        with pytest.raises(SyntaxError, match=msg):
+            df.query("i - +", engine=engine, parser=parser)
+
+    def test_query_scope(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((20, 2)), columns=list("ab")
+        )
+
+        a, b = 1, 2  # noqa: F841
+        res = df.query("a > b", engine=engine, parser=parser)
+        expected = df[df.a > df.b]
+        tm.assert_frame_equal(res, expected)
+
+        res = df.query("@a > b", engine=engine, parser=parser)
+        expected = df[a > df.b]
+        tm.assert_frame_equal(res, expected)
+
+        # no local variable c
+        with pytest.raises(
+            UndefinedVariableError, match="local variable 'c' is not defined"
+        ):
+            df.query("@a > b > @c", engine=engine, parser=parser)
+
+        # no column named 'c'
+        with pytest.raises(UndefinedVariableError, match="name 'c' is not defined"):
+            df.query("@a > b > c", engine=engine, parser=parser)
+
+    def test_query_doesnt_pickup_local(self, engine, parser):
+        n = m = 10
+        df = DataFrame(
+            np.random.default_rng(2).integers(m, size=(n, 3)), columns=list("abc")
+        )
+
+        # we don't pick up the local 'sin'
+        with pytest.raises(UndefinedVariableError, match="name 'sin' is not defined"):
+            df.query("sin > 5", engine=engine, parser=parser)
+
+    def test_query_builtin(self, engine, parser):
+        n = m = 10
+        df = DataFrame(
+            np.random.default_rng(2).integers(m, size=(n, 3)), columns=list("abc")
+        )
+
+        df.index.name = "sin"
+        msg = "Variables in expression.+"
+        with pytest.raises(NumExprClobberingError, match=msg):
+            df.query("sin > 5", engine=engine, parser=parser)
+
+    def test_query(self, engine, parser):
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((10, 3)), columns=["a", "b", "c"]
+        )
+
+        tm.assert_frame_equal(
+            df.query("a < b", engine=engine, parser=parser), df[df.a < df.b]
+        )
+        tm.assert_frame_equal(
+            df.query("a + b > b * c", engine=engine, parser=parser),
+            df[df.a + df.b > df.b * df.c],
+        )
+
+    def test_query_index_with_name(self, engine, parser):
+        df = DataFrame(
+            np.random.default_rng(2).integers(10, size=(10, 3)),
+            index=Index(range(10), name="blob"),
+            columns=["a", "b", "c"],
+        )
+        res = df.query("(blob < 5) & (a < b)", engine=engine, parser=parser)
+        expec = df[(df.index < 5) & (df.a < df.b)]
+        tm.assert_frame_equal(res, expec)
+
+        res = df.query("blob < b", engine=engine, parser=parser)
+        expec = df[df.index < df.b]
+
+        tm.assert_frame_equal(res, expec)
+
+    def test_query_index_without_name(self, engine, parser):
+        df = DataFrame(
+            np.random.default_rng(2).integers(10, size=(10, 3)),
+            index=range(10),
+            columns=["a", "b", "c"],
+        )
+
+        # "index" should refer to the index
+        res = df.query("index < b", engine=engine, parser=parser)
+        expec = df[df.index < df.b]
+        tm.assert_frame_equal(res, expec)
+
+        # test against a scalar
+        res = df.query("index < 5", engine=engine, parser=parser)
+        expec = df[df.index < 5]
+        tm.assert_frame_equal(res, expec)
+
+    def test_nested_scope(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        df2 = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        expected = df[(df > 0) & (df2 > 0)]
+
+        result = df.query("(@df > 0) & (@df2 > 0)", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expected)
+
+        result = pd.eval("df[df > 0 and df2 > 0]", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expected)
+
+        result = pd.eval(
+            "df[df > 0 and df2 > 0 and df[df > 0] > 0]", engine=engine, parser=parser
+        )
+        expected = df[(df > 0) & (df2 > 0) & (df[df > 0] > 0)]
+        tm.assert_frame_equal(result, expected)
+
+        result = pd.eval("df[(df>0) & (df2>0)]", engine=engine, parser=parser)
+        expected = df.query("(@df>0) & (@df2>0)", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expected)
+
+    def test_nested_raises_on_local_self_reference(self, engine, parser):
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+
+        # can't reference ourself b/c we're a local so @ is necessary
+        with pytest.raises(UndefinedVariableError, match="name 'df' is not defined"):
+            df.query("df > 0", engine=engine, parser=parser)
+
+    def test_local_syntax(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((100, 10)),
+            columns=list("abcdefghij"),
+        )
+        b = 1
+        expect = df[df.a < b]
+        result = df.query("a < @b", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expect)
+
+        expect = df[df.a < df.b]
+        result = df.query("a < b", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expect)
+
+    def test_chained_cmp_and_in(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+        cols = list("abc")
+        df = DataFrame(
+            np.random.default_rng(2).standard_normal((100, len(cols))), columns=cols
+        )
+        res = df.query(
+            "a < b < c and a not in b not in c", engine=engine, parser=parser
+        )
+        ind = (df.a < df.b) & (df.b < df.c) & ~df.b.isin(df.a) & ~df.c.isin(df.b)
+        expec = df[ind]
+        tm.assert_frame_equal(res, expec)
+
+    def test_local_variable_with_in(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+        a = Series(np.random.default_rng(2).integers(3, size=15), name="a")
+        b = Series(np.random.default_rng(2).integers(10, size=15), name="b")
+        df = DataFrame({"a": a, "b": b})
+
+        expected = df.loc[(df.b - 1).isin(a)]
+        result = df.query("b - 1 in a", engine=engine, parser=parser)
+        tm.assert_frame_equal(expected, result)
+
+        b = Series(np.random.default_rng(2).integers(10, size=15), name="b")
+        expected = df.loc[(b - 1).isin(a)]
+        result = df.query("@b - 1 in a", engine=engine, parser=parser)
+        tm.assert_frame_equal(expected, result)
+
+    def test_at_inside_string(self, engine, parser):
+        skip_if_no_pandas_parser(parser)
+        c = 1  # noqa: F841
+        df = DataFrame({"a": ["a", "a", "b", "b", "@c", "@c"]})
+        result = df.query('a == "@c"', engine=engine, parser=parser)
+        expected = df[df.a == "@c"]
+        tm.assert_frame_equal(result, expected)
+
+    def test_query_undefined_local(self):
+        engine, parser = self.engine, self.parser
+        skip_if_no_pandas_parser(parser)
+
+        df = DataFrame(np.random.default_rng(2).random((10, 2)), columns=list("ab"))
+        with pytest.raises(
+            UndefinedVariableError, match="local variable 'c' is not defined"
+        ):
+            df.query("a == @c", engine=engine, parser=parser)
+
+    def test_index_resolvers_come_after_columns_with_the_same_name(
+        self, engine, parser
+    ):
+        n = 1  # noqa: F841
+        a = np.r_[20:101:20]
+
+        df = DataFrame(
+            {"index": a, "b": np.random.default_rng(2).standard_normal(a.size)}
+        )
+        df.index.name = "index"
+        result = df.query("index > 5", engine=engine, parser=parser)
+        expected = df[df["index"] > 5]
+        tm.assert_frame_equal(result, expected)
+
+        df = DataFrame(
+            {"index": a, "b": np.random.default_rng(2).standard_normal(a.size)}
+        )
+        result = df.query("ilevel_0 > 5", engine=engine, parser=parser)
+        expected = df.loc[df.index[df.index > 5]]
+        tm.assert_frame_equal(result, expected)
+
+        df = DataFrame({"a": a, "b": np.random.default_rng(2).standard_normal(a.size)})
+        df.index.name = "a"
+        result = df.query("a > 5", engine=engine, parser=parser)
+        expected = df[df.a > 5]
+        tm.assert_frame_equal(result, expected)
+
+        result = df.query("index > 5", engine=engine, parser=parser)
+        expected = df.loc[df.index[df.index > 5]]
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("op, f", [["==", operator.eq], ["!=", operator.ne]])
+    def test_inf(self, op, f, engine, parser):
+        n = 10
+        df = DataFrame(
+            {
+                "a": np.random.default_rng(2).random(n),
+                "b": np.random.default_rng(2).random(n),
+            }
+        )
+        df.loc[::2, 0] = np.inf
+        q = f"a {op} inf"
+        expected = df[f(df.a, np.inf)]
+        result = df.query(q, engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expected)
+
+    def test_check_tz_aware_index_query(self, tz_aware_fixture):
+        # https://github.com/pandas-dev/pandas/issues/29463
+        tz = tz_aware_fixture
+        df_index = date_range(
+            start="2019-01-01", freq="1d", periods=10, tz=tz, name="time"
+        )
+        expected = DataFrame(index=df_index)
+        df = DataFrame(index=df_index)
+        result = df.query('"2018-01-03 00:00:00+00" < time')
+        tm.assert_frame_equal(result, expected)
+
+        expected = DataFrame(df_index)
+        result = df.reset_index().query('"2018-01-03 00:00:00+00" < time')
+        tm.assert_frame_equal(result, expected)
+
+    def test_method_calls_in_query(self, engine, parser):
+        # https://github.com/pandas-dev/pandas/issues/22435
+        n = 10
+        df = DataFrame(
+            {
+                "a": 2 * np.random.default_rng(2).random(n),
+                "b": np.random.default_rng(2).random(n),
+            }
+        )
+        expected = df[df["a"].astype("int") == 0]
+        result = df.query("a.astype('int') == 0", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expected)
+
+        df = DataFrame(
+            {
+                "a": np.where(
+                    np.random.default_rng(2).random(n) < 0.5,
+                    np.nan,
+                    np.random.default_rng(2).standard_normal(n),
+                ),
+                "b": np.random.default_rng(2).standard_normal(n),
+            }
+        )
+        expected = df[df["a"].notnull()]
+        result = df.query("a.notnull()", engine=engine, parser=parser)
+        tm.assert_frame_equal(result, expected)
+
+
+@td.skip_if_no("numexpr")
+class TestDataFrameQueryNumExprPython(TestDataFrameQueryNumExprPandas):
+    @pytest.fixture
+    def engine(self):
+        return "numexpr"
+
+    @pytest.fixture
+    def parser(self):
+        return "python"
+
+    def test_date_query_no_attribute_access(self, engine, parser):
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=5)
+        df["dates2"] = date_range("1/1/2013", periods=5)
+        df["dates3"] = date_range("1/1/2014", periods=5)
+        res = df.query(
+            "(dates1 < 20130101) & (20130101 < dates3)", engine=engine, parser=parser
+        )
+        expec = df[(df.dates1 < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_query_with_NaT(self, engine, parser):
+        n = 10
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates2"] = date_range("1/1/2013", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        df.loc[np.random.default_rng(2).random(n) > 0.5, "dates1"] = pd.NaT
+        df.loc[np.random.default_rng(2).random(n) > 0.5, "dates3"] = pd.NaT
+        res = df.query(
+            "(dates1 < 20130101) & (20130101 < dates3)", engine=engine, parser=parser
+        )
+        expec = df[(df.dates1 < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_index_query(self, engine, parser):
+        n = 10
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        return_value = df.set_index("dates1", inplace=True, drop=True)
+        assert return_value is None
+        res = df.query(
+            "(index < 20130101) & (20130101 < dates3)", engine=engine, parser=parser
+        )
+        expec = df[(df.index < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_index_query_with_NaT(self, engine, parser):
+        n = 10
+        # Cast to object to avoid implicit cast when setting entry to pd.NaT below
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3))).astype(
+            {0: object}
+        )
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        df.iloc[0, 0] = pd.NaT
+        return_value = df.set_index("dates1", inplace=True, drop=True)
+        assert return_value is None
+        res = df.query(
+            "(index < 20130101) & (20130101 < dates3)", engine=engine, parser=parser
+        )
+        expec = df[(df.index < "20130101") & ("20130101" < df.dates3)]
+        tm.assert_frame_equal(res, expec)
+
+    def test_date_index_query_with_NaT_duplicates(self, engine, parser):
+        n = 10
+        df = DataFrame(np.random.default_rng(2).standard_normal((n, 3)))
+        df["dates1"] = date_range("1/1/2012", periods=n)
+        df["dates3"] = date_range("1/1/2014", periods=n)
+        df.loc[np.random.default_rng(2).random(n) > 0.5, "dates1"] = pd.NaT
+        return_value = df.set_index("dates1", inplace=True, drop=True)
+        assert return_value is None
+        msg = r"'BoolOp' nodes are not implemented"
+        with pytest.raises(NotImplementedError, match=msg):
+            df.query("index < 20130101 < dates3", engine=engine, parser=parser)
+
+    def test_nested_scope(self, engine, parser):
+        # smoke test
+        x = 1  # noqa: F841
+        result = pd.eval("x + 1", engine=engine, parser=parser)
+        assert result == 2
+
+        df = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+        df2 = DataFrame(np.random.default_rng(2).standard_normal((5, 3)))
+
+        # don't have the pandas parser
+        msg = r"The '@' prefix is only supported by the pandas parser"
+        with pytest.raises(SyntaxError, match=msg):
+            df.query("(@df>0) & (@df2>0)", engine=engine, parser=parser)
+
+        with pytest.raises(UndefinedVariableError, match="name 'df' is not defined"):
+            df.query("(df>0) & (df2>0)", engine=engine, parser=parser)
+
+        expected = df[(df > 0) & (df2 > 0)]
+        result = pd.eval("df[(df > 0) & (df2 > 0)]", engine=engine, parser=parser)
+        tm.assert_frame_equal(expected, result)
+
+        expected = df[(df > 0) & (df2 > 0) & (df[df > 0] > 0)]
+        result = pd.eval(
+            "df[(df > 0) & (df2 > 0) & (df[df > 0] > 0)]", engine=engine, parser=parser
+        )
+        tm.assert_frame_equal(expected, result)
+
+    def test_query_numexpr_with_min_and_max_columns(self):
+        df = DataFrame({"min": [1, 2, 3], "max": [4, 5, 6]})
+        regex_to_match = (
+            r"Variables in expression \"\(min\) == \(1\)\" "
+            r"overlap with builtins: \('min'\)"
+        )
+        with pytest.raises(NumExprClobberingError, match=regex_to_match):
+            df.query("min == 1")
+
+        regex_to_match = (
+            r"Variables in expression \"\(max\) == \(1\)\" "
+            r"overlap with builtins: \('max'\)"
+        )
+        with pytest.raises(NumExprClobberingError, match=regex_to_match):
+            df.query("max == 1")
+
+
+class TestDataFrameQueryPythonPandas(TestDataFrameQueryNumExprPandas):
+    @pytest.fixture
+    def engine(self):
+        return "python"
+
+    @pytest.fixture
+    def parser(self):
+        return "pandas"
+
+    def test_query_builtin(self, engine, parser):
+        n = m = 10
+        df = DataFrame(
+            np.random.default_rng(2).integers(m, size=(n, 3)), columns=list("abc")
+        )
+
+        df.index.name = "sin"
+        expected = df[df.index > 5]
+        result = df.query("sin > 5", engine=engine, parser=parser)
+        tm.assert_frame_equal(expected, result)
+
+
+class TestDataFrameQueryPythonPython(TestDataFrameQueryNumExprPython):
+    @pytest.fixture
+    def engine(self):
+        return "python"
+
+    @pytest.fixture
+    def parser(self):
+        return "python"
+
+    def test_query_builtin(self, engine, parser):
+        n = m = 10
+        df = DataFrame(
+            np.random.default_rng(2).integers(m, size=(n, 3)), columns=list("abc")
+        )
+
+        df.index.name = "sin"
+        expected = df[df.index > 5]
+        result = df.query("sin > 5", engine=engine, parser=parser)
+        tm.assert_frame_equal(expected, result)
+
+
+class TestDataFrameQueryStrings:
+    def test_str_query_method(self, parser, engine):
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 1)), columns=["b"])
+        df["strings"] = Series(list("aabbccddee"))
+        expect = df[df.strings == "a"]
+
+        if parser != "pandas":
+            col = "strings"
+            lst = '"a"'
+
+            lhs = [col] * 2 + [lst] * 2
+            rhs = lhs[::-1]
+
+            eq, ne = "==", "!="
+            ops = 2 * ([eq] + [ne])
+            msg = r"'(Not)?In' nodes are not implemented"
+
+            for lhs, op, rhs in zip(lhs, ops, rhs):
+                ex = f"{lhs} {op} {rhs}"
+                with pytest.raises(NotImplementedError, match=msg):
+                    df.query(
+                        ex,
+                        engine=engine,
+                        parser=parser,
+                        local_dict={"strings": df.strings},
+                    )
+        else:
+            res = df.query('"a" == strings', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+
+            res = df.query('strings == "a"', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+            tm.assert_frame_equal(res, df[df.strings.isin(["a"])])
+
+            expect = df[df.strings != "a"]
+            res = df.query('strings != "a"', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+
+            res = df.query('"a" != strings', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+            tm.assert_frame_equal(res, df[~df.strings.isin(["a"])])
+
+    def test_str_list_query_method(self, parser, engine):
+        df = DataFrame(np.random.default_rng(2).standard_normal((10, 1)), columns=["b"])
+        df["strings"] = Series(list("aabbccddee"))
+        expect = df[df.strings.isin(["a", "b"])]
+
+        if parser != "pandas":
+            col = "strings"
+            lst = '["a", "b"]'
+
+            lhs = [col] * 2 + [lst] * 2
+            rhs = lhs[::-1]
+
+            eq, ne = "==", "!="
+            ops = 2 * ([eq] + [ne])
+            msg = r"'(Not)?In' nodes are not implemented"
+
+            for lhs, op, rhs in zip(lhs, ops, rhs):
+                ex = f"{lhs} {op} {rhs}"
+                with pytest.raises(NotImplementedError, match=msg):
+                    df.query(ex, engine=engine, parser=parser)
+        else:
+            res = df.query('strings == ["a", "b"]', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+
+            res = df.query('["a", "b"] == strings', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+
+            expect = df[~df.strings.isin(["a", "b"])]
+
+            res = df.query('strings != ["a", "b"]', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+
+            res = df.query('["a", "b"] != strings', engine=engine, parser=parser)
+            tm.assert_frame_equal(res, expect)
+
+    def test_query_with_string_columns(self, parser, engine):
+        df = DataFrame(
+            {
+                "a": list("aaaabbbbcccc"),
+                "b": list("aabbccddeeff"),
+                "c": np.random.default_rng(2).integers(5, size=12),
+                "d": np.random.default_rng(2).integers(9, size=12),
+            }
+        )
+        if parser == "pandas":
+            res = df.query("a in b", parser=parser, engine=engine)
+            expec = df[df.a.isin(df.b)]
+            tm.assert_frame_equal(res, expec)
+
+            res = df.query("a in b and c < d", parser=parser, engine=engine)
+            expec = df[df.a.isin(df.b) & (df.c < df.d)]
+            tm.assert_frame_equal(res, expec)
+        else:
+            msg = r"'(Not)?In' nodes are not implemented"
+            with pytest.raises(NotImplementedError, match=msg):
+                df.query("a in b", parser=parser, engine=engine)
+
+            msg = r"'BoolOp' nodes are not implemented"
+            with pytest.raises(NotImplementedError, match=msg):
+                df.query("a in b and c < d", parser=parser, engine=engine)
+
+    def test_object_array_eq_ne(self, parser, engine, using_infer_string):
+        df = DataFrame(
+            {
+                "a": list("aaaabbbbcccc"),
+                "b": list("aabbccddeeff"),
+                "c": np.random.default_rng(2).integers(5, size=12),
+                "d": np.random.default_rng(2).integers(9, size=12),
+            }
+        )
+        warning = RuntimeWarning if using_infer_string and engine == "numexpr" else None
+        with tm.assert_produces_warning(warning):
+            res = df.query("a == b", parser=parser, engine=engine)
+        exp = df[df.a == df.b]
+        tm.assert_frame_equal(res, exp)
+
+        with tm.assert_produces_warning(warning):
+            res = df.query("a != b", parser=parser, engine=engine)
+        exp = df[df.a != df.b]
+        tm.assert_frame_equal(res, exp)
+
+    def test_query_with_nested_strings(self, parser, engine):
+        skip_if_no_pandas_parser(parser)
+        events = [
+            f"page {n} {act}" for n in range(1, 4) for act in ["load", "exit"]
+        ] * 2
+        stamps1 = date_range("2014-01-01 0:00:01", freq="30s", periods=6)
+        stamps2 = date_range("2014-02-01 1:00:01", freq="30s", periods=6)
+        df = DataFrame(
+            {
+                "id": np.arange(1, 7).repeat(2),
+                "event": events,
+                "timestamp": stamps1.append(stamps2),
+            }
+        )
+
+        expected = df[df.event == '"page 1 load"']
+        res = df.query("""'"page 1 load"' in event""", parser=parser, engine=engine)
+        tm.assert_frame_equal(expected, res)
+
+    def test_query_with_nested_special_character(self, parser, engine):
+        skip_if_no_pandas_parser(parser)
+        df = DataFrame({"a": ["a", "b", "test & test"], "b": [1, 2, 3]})
+        res = df.query('a == "test & test"', parser=parser, engine=engine)
+        expec = df[df.a == "test & test"]
+        tm.assert_frame_equal(res, expec)
+
+    @pytest.mark.parametrize(
+        "op, func",
+        [
+            ["<", operator.lt],
+            [">", operator.gt],
+            ["<=", operator.le],
+            [">=", operator.ge],
+        ],
+    )
+    def test_query_lex_compare_strings(
+        self, parser, engine, op, func, using_infer_string
+    ):
+        a = Series(np.random.default_rng(2).choice(list("abcde"), 20))
+        b = Series(np.arange(a.size))
+        df = DataFrame({"X": a, "Y": b})
+
+        warning = RuntimeWarning if using_infer_string and engine == "numexpr" else None
+        with tm.assert_produces_warning(warning):
+            res = df.query(f'X {op} "d"', engine=engine, parser=parser)
+        expected = df[func(df.X, "d")]
+        tm.assert_frame_equal(res, expected)
+
+    def test_query_single_element_booleans(self, parser, engine):
+        columns = "bid", "bidsize", "ask", "asksize"
+        data = np.random.default_rng(2).integers(2, size=(1, len(columns))).astype(bool)
+        df = DataFrame(data, columns=columns)
+        res = df.query("bid & ask", engine=engine, parser=parser)
+        expected = df[df.bid & df.ask]
+        tm.assert_frame_equal(res, expected)
+
+    def test_query_string_scalar_variable(self, parser, engine):
+        skip_if_no_pandas_parser(parser)
+        df = DataFrame(
+            {
+                "Symbol": ["BUD US", "BUD US", "IBM US", "IBM US"],
+                "Price": [109.70, 109.72, 183.30, 183.35],
+            }
+        )
+        e = df[df.Symbol == "BUD US"]
+        symb = "BUD US"  # noqa: F841
+        r = df.query("Symbol == @symb", parser=parser, engine=engine)
+        tm.assert_frame_equal(e, r)
+
+    @pytest.mark.parametrize(
+        "in_list",
+        [
+            [None, "asdf", "ghjk"],
+            ["asdf", None, "ghjk"],
+            ["asdf", "ghjk", None],
+            [None, None, "asdf"],
+            ["asdf", None, None],
+            [None, None, None],
+        ],
+    )
+    def test_query_string_null_elements(self, in_list):
+        # GITHUB ISSUE #31516
+        parser = "pandas"
+        engine = "python"
+        expected = {i: value for i, value in enumerate(in_list) if value == "asdf"}
+
+        df_expected = DataFrame({"a": expected}, dtype="string")
+        df_expected.index = df_expected.index.astype("int64")
+        df = DataFrame({"a": in_list}, dtype="string")
+        res1 = df.query("a == 'asdf'", parser=parser, engine=engine)
+        res2 = df[df["a"] == "asdf"]
+        res3 = df.query("a <= 'asdf'", parser=parser, engine=engine)
+        tm.assert_frame_equal(res1, df_expected)
+        tm.assert_frame_equal(res1, res2)
+        tm.assert_frame_equal(res1, res3)
+        tm.assert_frame_equal(res2, res3)
+
+
+class TestDataFrameEvalWithFrame:
+    @pytest.fixture
+    def frame(self):
+        return DataFrame(
+            np.random.default_rng(2).standard_normal((10, 3)), columns=list("abc")
+        )
+
+    def test_simple_expr(self, frame, parser, engine):
+        res = frame.eval("a + b", engine=engine, parser=parser)
+        expect = frame.a + frame.b
+        tm.assert_series_equal(res, expect)
+
+    def test_bool_arith_expr(self, frame, parser, engine):
+        res = frame.eval("a[a < 1] + b", engine=engine, parser=parser)
+        expect = frame.a[frame.a < 1] + frame.b
+        tm.assert_series_equal(res, expect)
+
+    @pytest.mark.parametrize("op", ["+", "-", "*", "/"])
+    def test_invalid_type_for_operator_raises(self, parser, engine, op):
+        df = DataFrame({"a": [1, 2], "b": ["c", "d"]})
+        msg = r"unsupported operand type\(s\) for .+: '.+' and '.+'|Cannot"
+
+        with pytest.raises(TypeError, match=msg):
+            df.eval(f"a {op} b", engine=engine, parser=parser)
+
+
+class TestDataFrameQueryBacktickQuoting:
+    @pytest.fixture
+    def df(self):
+        """
+        Yields a dataframe with strings that may or may not need escaping
+        by backticks. The last two columns cannot be escaped by backticks
+        and should raise a ValueError.
+        """
+        yield DataFrame(
+            {
+                "A": [1, 2, 3],
+                "B B": [3, 2, 1],
+                "C C": [4, 5, 6],
+                "C  C": [7, 4, 3],
+                "C_C": [8, 9, 10],
+                "D_D D": [11, 1, 101],
+                "E.E": [6, 3, 5],
+                "F-F": [8, 1, 10],
+                "1e1": [2, 4, 8],
+                "def": [10, 11, 2],
+                "A (x)": [4, 1, 3],
+                "B(x)": [1, 1, 5],
+                "B (x)": [2, 7, 4],
+                "  &^ :!€$?(} >    <++*''  ": [2, 5, 6],
+                "": [10, 11, 1],
+                " A": [4, 7, 9],
+                "  ": [1, 2, 1],
+                "it's": [6, 3, 1],
+                "that's": [9, 1, 8],
+                "☺": [8, 7, 6],
+                "foo#bar": [2, 4, 5],
+                1: [5, 7, 9],
+            }
+        )
+
+    def test_single_backtick_variable_query(self, df):
+        res = df.query("1 < `B B`")
+        expect = df[1 < df["B B"]]
+        tm.assert_frame_equal(res, expect)
+
+    def test_two_backtick_variables_query(self, df):
+        res = df.query("1 < `B B` and 4 < `C C`")
+        expect = df[(1 < df["B B"]) & (4 < df["C C"])]
+        tm.assert_frame_equal(res, expect)
+
+    def test_single_backtick_variable_expr(self, df):
+        res = df.eval("A + `B B`")
+        expect = df["A"] + df["B B"]
+        tm.assert_series_equal(res, expect)
+
+    def test_two_backtick_variables_expr(self, df):
+        res = df.eval("`B B` + `C C`")
+        expect = df["B B"] + df["C C"]
+        tm.assert_series_equal(res, expect)
+
+    def test_already_underscore_variable(self, df):
+        res = df.eval("`C_C` + A")
+        expect = df["C_C"] + df["A"]
+        tm.assert_series_equal(res, expect)
+
+    def test_same_name_but_underscores(self, df):
+        res = df.eval("C_C + `C C`")
+        expect = df["C_C"] + df["C C"]
+        tm.assert_series_equal(res, expect)
+
+    def test_mixed_underscores_and_spaces(self, df):
+        res = df.eval("A + `D_D D`")
+        expect = df["A"] + df["D_D D"]
+        tm.assert_series_equal(res, expect)
+
+    def test_backtick_quote_name_with_no_spaces(self, df):
+        res = df.eval("A + `C_C`")
+        expect = df["A"] + df["C_C"]
+        tm.assert_series_equal(res, expect)
+
+    def test_special_characters(self, df):
+        res = df.eval("`E.E` + `F-F` - A")
+        expect = df["E.E"] + df["F-F"] - df["A"]
+        tm.assert_series_equal(res, expect)
+
+    def test_start_with_digit(self, df):
+        res = df.eval("A + `1e1`")
+        expect = df["A"] + df["1e1"]
+        tm.assert_series_equal(res, expect)
+
+    def test_keyword(self, df):
+        res = df.eval("A + `def`")
+        expect = df["A"] + df["def"]
+        tm.assert_series_equal(res, expect)
+
+    def test_unneeded_quoting(self, df):
+        res = df.query("`A` > 2")
+        expect = df[df["A"] > 2]
+        tm.assert_frame_equal(res, expect)
+
+    def test_parenthesis(self, df):
+        res = df.query("`A (x)` > 2")
+        expect = df[df["A (x)"] > 2]
+        tm.assert_frame_equal(res, expect)
+
+    def test_empty_string(self, df):
+        res = df.query("`` > 5")
+        expect = df[df[""] > 5]
+        tm.assert_frame_equal(res, expect)
+
+    def test_multiple_spaces(self, df):
+        res = df.query("`C  C` > 5")
+        expect = df[df["C  C"] > 5]
+        tm.assert_frame_equal(res, expect)
+
+    def test_start_with_spaces(self, df):
+        res = df.eval("` A` + `  `")
+        expect = df[" A"] + df["  "]
+        tm.assert_series_equal(res, expect)
+
+    def test_lots_of_operators_string(self, df):
+        res = df.query("`  &^ :!€$?(} >    <++*''  ` > 4")
+        expect = df[df["  &^ :!€$?(} >    <++*''  "] > 4]
+        tm.assert_frame_equal(res, expect)
+
+    def test_missing_attribute(self, df):
+        message = "module 'pandas' has no attribute 'thing'"
+        with pytest.raises(AttributeError, match=message):
+            df.eval("@pd.thing")
+
+    def test_failing_quote(self, df):
+        msg = r"(Could not convert ).*( to a valid Python identifier.)"
+        with pytest.raises(SyntaxError, match=msg):
+            df.query("`it's` > `that's`")
+
+    def test_failing_character_outside_range(self, df):
+        msg = r"(Could not convert ).*( to a valid Python identifier.)"
+        with pytest.raises(SyntaxError, match=msg):
+            df.query("`☺` > 4")
+
+    def test_failing_hashtag(self, df):
+        msg = "Failed to parse backticks"
+        with pytest.raises(SyntaxError, match=msg):
+            df.query("`foo#bar` > 4")
+
+    def test_call_non_named_expression(self, df):
+        """
+        Only attributes and variables ('named functions') can be called.
+        .__call__() is not an allowed attribute because that would allow
+        calling anything.
+        https://github.com/pandas-dev/pandas/pull/32460
+        """
+
+        def func(*_):
+            return 1
+
+        funcs = [func]  # noqa: F841
+
+        df.eval("@func()")
+
+        with pytest.raises(TypeError, match="Only named functions are supported"):
+            df.eval("@funcs[0]()")
+
+        with pytest.raises(TypeError, match="Only named functions are supported"):
+            df.eval("@funcs[0].__call__()")
+
+    def test_ea_dtypes(self, any_numeric_ea_and_arrow_dtype):
+        # GH#29618
+        df = DataFrame(
+            [[1, 2], [3, 4]], columns=["a", "b"], dtype=any_numeric_ea_and_arrow_dtype
+        )
+        warning = RuntimeWarning if NUMEXPR_INSTALLED else None
+        with tm.assert_produces_warning(warning):
+            result = df.eval("c = b - a")
+        expected = DataFrame(
+            [[1, 2, 1], [3, 4, 1]],
+            columns=["a", "b", "c"],
+            dtype=any_numeric_ea_and_arrow_dtype,
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_ea_dtypes_and_scalar(self):
+        # GH#29618
+        df = DataFrame([[1, 2], [3, 4]], columns=["a", "b"], dtype="Float64")
+        warning = RuntimeWarning if NUMEXPR_INSTALLED else None
+        with tm.assert_produces_warning(warning):
+            result = df.eval("c = b - 1")
+        expected = DataFrame(
+            [[1, 2, 1], [3, 4, 3]], columns=["a", "b", "c"], dtype="Float64"
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_ea_dtypes_and_scalar_operation(self, any_numeric_ea_and_arrow_dtype):
+        # GH#29618
+        df = DataFrame(
+            [[1, 2], [3, 4]], columns=["a", "b"], dtype=any_numeric_ea_and_arrow_dtype
+        )
+        result = df.eval("c = 2 - 1")
+        expected = DataFrame(
+            {
+                "a": Series([1, 3], dtype=any_numeric_ea_and_arrow_dtype),
+                "b": Series([2, 4], dtype=any_numeric_ea_and_arrow_dtype),
+                "c": Series([1, 1], dtype=result["c"].dtype),
+            }
+        )
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("dtype", ["int64", "Int64", "int64[pyarrow]"])
+    def test_query_ea_dtypes(self, dtype):
+        if dtype == "int64[pyarrow]":
+            pytest.importorskip("pyarrow")
+        # GH#50261
+        df = DataFrame({"a": Series([1, 2], dtype=dtype)})
+        ref = {2}  # noqa: F841
+        warning = RuntimeWarning if dtype == "Int64" and NUMEXPR_INSTALLED else None
+        with tm.assert_produces_warning(warning):
+            result = df.query("a in @ref")
+        expected = DataFrame({"a": Series([2], dtype=dtype, index=[1])})
+        tm.assert_frame_equal(result, expected)
+
+    @pytest.mark.parametrize("engine", ["python", "numexpr"])
+    @pytest.mark.parametrize("dtype", ["int64", "Int64", "int64[pyarrow]"])
+    def test_query_ea_equality_comparison(self, dtype, engine):
+        # GH#50261
+        warning = RuntimeWarning if engine == "numexpr" else None
+        if engine == "numexpr" and not NUMEXPR_INSTALLED:
+            pytest.skip("numexpr not installed")
+        if dtype == "int64[pyarrow]":
+            pytest.importorskip("pyarrow")
+        df = DataFrame(
+            {"A": Series([1, 1, 2], dtype="Int64"), "B": Series([1, 2, 2], dtype=dtype)}
+        )
+        with tm.assert_produces_warning(warning):
+            result = df.query("A == B", engine=engine)
+        expected = DataFrame(
+            {
+                "A": Series([1, 2], dtype="Int64", index=[0, 2]),
+                "B": Series([1, 2], dtype=dtype, index=[0, 2]),
+            }
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_all_nat_in_object(self):
+        # GH#57068
+        now = pd.Timestamp.now("UTC")  # noqa: F841
+        df = DataFrame({"a": pd.to_datetime([None, None], utc=True)}, dtype=object)
+        result = df.query("a > @now")
+        expected = DataFrame({"a": []}, dtype=object)
+        tm.assert_frame_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_reductions.py

@@ -0,0 +1,2157 @@
+from datetime import timedelta
+from decimal import Decimal
+import re
+
+from dateutil.tz import tzlocal
+import numpy as np
+import pytest
+
+from pandas._config import using_pyarrow_string_dtype
+
+from pandas.compat import (
+    IS64,
+    is_platform_windows,
+)
+from pandas.compat.numpy import np_version_gt2
+import pandas.util._test_decorators as td
+
+import pandas as pd
+from pandas import (
+    Categorical,
+    CategoricalDtype,
+    DataFrame,
+    DatetimeIndex,
+    Index,
+    PeriodIndex,
+    RangeIndex,
+    Series,
+    Timestamp,
+    date_range,
+    isna,
+    notna,
+    to_datetime,
+    to_timedelta,
+)
+import pandas._testing as tm
+from pandas.core import (
+    algorithms,
+    nanops,
+)
+
+is_windows_np2_or_is32 = (is_platform_windows() and not np_version_gt2) or not IS64
+is_windows_or_is32 = is_platform_windows() or not IS64
+
+
+def make_skipna_wrapper(alternative, skipna_alternative=None):
+    """
+    Create a function for calling on an array.
+
+    Parameters
+    ----------
+    alternative : function
+        The function to be called on the array with no NaNs.
+        Only used when 'skipna_alternative' is None.
+    skipna_alternative : function
+        The function to be called on the original array
+
+    Returns
+    -------
+    function
+    """
+    if skipna_alternative:
+
+        def skipna_wrapper(x):
+            return skipna_alternative(x.values)
+
+    else:
+
+        def skipna_wrapper(x):
+            nona = x.dropna()
+            if len(nona) == 0:
+                return np.nan
+            return alternative(nona)
+
+    return skipna_wrapper
+
+
+def assert_stat_op_calc(
+    opname,
+    alternative,
+    frame,
+    has_skipna=True,
+    check_dtype=True,
+    check_dates=False,
+    rtol=1e-5,
+    atol=1e-8,
+    skipna_alternative=None,
+):
+    """
+    Check that operator opname works as advertised on frame
+
+    Parameters
+    ----------
+    opname : str
+        Name of the operator to test on frame
+    alternative : function
+        Function that opname is tested against; i.e. "frame.opname()" should
+        equal "alternative(frame)".
+    frame : DataFrame
+        The object that the tests are executed on
+    has_skipna : bool, default True
+        Whether the method "opname" has the kwarg "skip_na"
+    check_dtype : bool, default True
+        Whether the dtypes of the result of "frame.opname()" and
+        "alternative(frame)" should be checked.
+    check_dates : bool, default false
+        Whether opname should be tested on a Datetime Series
+    rtol : float, default 1e-5
+        Relative tolerance.
+    atol : float, default 1e-8
+        Absolute tolerance.
+    skipna_alternative : function, default None
+        NaN-safe version of alternative
+    """
+    f = getattr(frame, opname)
+
+    if check_dates:
+        df = DataFrame({"b": date_range("1/1/2001", periods=2)})
+        with tm.assert_produces_warning(None):
+            result = getattr(df, opname)()
+        assert isinstance(result, Series)
+
+        df["a"] = range(len(df))
+        with tm.assert_produces_warning(None):
+            result = getattr(df, opname)()
+        assert isinstance(result, Series)
+        assert len(result)
+
+    if has_skipna:
+
+        def wrapper(x):
+            return alternative(x.values)
+
+        skipna_wrapper = make_skipna_wrapper(alternative, skipna_alternative)
+        result0 = f(axis=0, skipna=False)
+        result1 = f(axis=1, skipna=False)
+        tm.assert_series_equal(
+            result0, frame.apply(wrapper), check_dtype=check_dtype, rtol=rtol, atol=atol
+        )
+        tm.assert_series_equal(
+            result1,
+            frame.apply(wrapper, axis=1),
+            rtol=rtol,
+            atol=atol,
+        )
+    else:
+        skipna_wrapper = alternative
+
+    result0 = f(axis=0)
+    result1 = f(axis=1)
+    tm.assert_series_equal(
+        result0,
+        frame.apply(skipna_wrapper),
+        check_dtype=check_dtype,
+        rtol=rtol,
+        atol=atol,
+    )
+
+    if opname in ["sum", "prod"]:
+        expected = frame.apply(skipna_wrapper, axis=1)
+        tm.assert_series_equal(
+            result1, expected, check_dtype=False, rtol=rtol, atol=atol
+        )
+
+    # check dtypes
+    if check_dtype:
+        lcd_dtype = frame.values.dtype
+        assert lcd_dtype == result0.dtype
+        assert lcd_dtype == result1.dtype
+
+    # bad axis
+    with pytest.raises(ValueError, match="No axis named 2"):
+        f(axis=2)
+
+    # all NA case
+    if has_skipna:
+        all_na = frame * np.nan
+        r0 = getattr(all_na, opname)(axis=0)
+        r1 = getattr(all_na, opname)(axis=1)
+        if opname in ["sum", "prod"]:
+            unit = 1 if opname == "prod" else 0  # result for empty sum/prod
+            expected = Series(unit, index=r0.index, dtype=r0.dtype)
+            tm.assert_series_equal(r0, expected)
+            expected = Series(unit, index=r1.index, dtype=r1.dtype)
+            tm.assert_series_equal(r1, expected)
+
+
+@pytest.fixture
+def bool_frame_with_na():
+    """
+    Fixture for DataFrame of booleans with index of unique strings
+
+    Columns are ['A', 'B', 'C', 'D']; some entries are missing
+    """
+    df = DataFrame(
+        np.concatenate(
+            [np.ones((15, 4), dtype=bool), np.zeros((15, 4), dtype=bool)], axis=0
+        ),
+        index=Index([f"foo_{i}" for i in range(30)], dtype=object),
+        columns=Index(list("ABCD"), dtype=object),
+        dtype=object,
+    )
+    # set some NAs
+    df.iloc[5:10] = np.nan
+    df.iloc[15:20, -2:] = np.nan
+    return df
+
+
+@pytest.fixture
+def float_frame_with_na():
+    """
+    Fixture for DataFrame of floats with index of unique strings
+
+    Columns are ['A', 'B', 'C', 'D']; some entries are missing
+    """
+    df = DataFrame(
+        np.random.default_rng(2).standard_normal((30, 4)),
+        index=Index([f"foo_{i}" for i in range(30)], dtype=object),
+        columns=Index(list("ABCD"), dtype=object),
+    )
+    # set some NAs
+    df.iloc[5:10] = np.nan
+    df.iloc[15:20, -2:] = np.nan
+    return df
+
+
+class TestDataFrameAnalytics:
+    # ---------------------------------------------------------------------
+    # Reductions
+    @pytest.mark.parametrize("axis", [0, 1])
+    @pytest.mark.parametrize(
+        "opname",
+        [
+            "count",
+            "sum",
+            "mean",
+            "product",
+            "median",
+            "min",
+            "max",
+            "nunique",
+            "var",
+            "std",
+            "sem",
+            pytest.param("skew", marks=td.skip_if_no("scipy")),
+            pytest.param("kurt", marks=td.skip_if_no("scipy")),
+        ],
+    )
+    def test_stat_op_api_float_string_frame(
+        self, float_string_frame, axis, opname, using_infer_string
+    ):
+        if (
+            (opname in ("sum", "min", "max") and axis == 0)
+            or opname
+            in (
+                "count",
+                "nunique",
+            )
+        ) and not (using_infer_string and opname == "sum"):
+            getattr(float_string_frame, opname)(axis=axis)
+        else:
+            if opname in ["var", "std", "sem", "skew", "kurt"]:
+                msg = "could not convert string to float: 'bar'"
+            elif opname == "product":
+                if axis == 1:
+                    msg = "can't multiply sequence by non-int of type 'float'"
+                else:
+                    msg = "can't multiply sequence by non-int of type 'str'"
+            elif opname == "sum":
+                msg = r"unsupported operand type\(s\) for \+: 'float' and 'str'"
+            elif opname == "mean":
+                if axis == 0:
+                    # different message on different builds
+                    msg = "|".join(
+                        [
+                            r"Could not convert \['.*'\] to numeric",
+                            "Could not convert string '(bar){30}' to numeric",
+                        ]
+                    )
+                else:
+                    msg = r"unsupported operand type\(s\) for \+: 'float' and 'str'"
+            elif opname in ["min", "max"]:
+                msg = "'[><]=' not supported between instances of 'float' and 'str'"
+            elif opname == "median":
+                msg = re.compile(
+                    r"Cannot convert \[.*\] to numeric|does not support", flags=re.S
+                )
+            if not isinstance(msg, re.Pattern):
+                msg = msg + "|does not support"
+            with pytest.raises(TypeError, match=msg):
+                getattr(float_string_frame, opname)(axis=axis)
+        if opname != "nunique":
+            getattr(float_string_frame, opname)(axis=axis, numeric_only=True)
+
+    @pytest.mark.parametrize("axis", [0, 1])
+    @pytest.mark.parametrize(
+        "opname",
+        [
+            "count",
+            "sum",
+            "mean",
+            "product",
+            "median",
+            "min",
+            "max",
+            "var",
+            "std",
+            "sem",
+            pytest.param("skew", marks=td.skip_if_no("scipy")),
+            pytest.param("kurt", marks=td.skip_if_no("scipy")),
+        ],
+    )
+    def test_stat_op_api_float_frame(self, float_frame, axis, opname):
+        getattr(float_frame, opname)(axis=axis, numeric_only=False)
+
+    def test_stat_op_calc(self, float_frame_with_na, mixed_float_frame):
+        def count(s):
+            return notna(s).sum()
+
+        def nunique(s):
+            return len(algorithms.unique1d(s.dropna()))
+
+        def var(x):
+            return np.var(x, ddof=1)
+
+        def std(x):
+            return np.std(x, ddof=1)
+
+        def sem(x):
+            return np.std(x, ddof=1) / np.sqrt(len(x))
+
+        assert_stat_op_calc(
+            "nunique",
+            nunique,
+            float_frame_with_na,
+            has_skipna=False,
+            check_dtype=False,
+            check_dates=True,
+        )
+
+        # GH#32571: rol needed for flaky CI builds
+        # mixed types (with upcasting happening)
+        assert_stat_op_calc(
+            "sum",
+            np.sum,
+            mixed_float_frame.astype("float32"),
+            check_dtype=False,
+            rtol=1e-3,
+        )
+
+        assert_stat_op_calc(
+            "sum", np.sum, float_frame_with_na, skipna_alternative=np.nansum
+        )
+        assert_stat_op_calc("mean", np.mean, float_frame_with_na, check_dates=True)
+        assert_stat_op_calc(
+            "product", np.prod, float_frame_with_na, skipna_alternative=np.nanprod
+        )
+
+        assert_stat_op_calc("var", var, float_frame_with_na)
+        assert_stat_op_calc("std", std, float_frame_with_na)
+        assert_stat_op_calc("sem", sem, float_frame_with_na)
+
+        assert_stat_op_calc(
+            "count",
+            count,
+            float_frame_with_na,
+            has_skipna=False,
+            check_dtype=False,
+            check_dates=True,
+        )
+
+    def test_stat_op_calc_skew_kurtosis(self, float_frame_with_na):
+        sp_stats = pytest.importorskip("scipy.stats")
+
+        def skewness(x):
+            if len(x) < 3:
+                return np.nan
+            return sp_stats.skew(x, bias=False)
+
+        def kurt(x):
+            if len(x) < 4:
+                return np.nan
+            return sp_stats.kurtosis(x, bias=False)
+
+        assert_stat_op_calc("skew", skewness, float_frame_with_na)
+        assert_stat_op_calc("kurt", kurt, float_frame_with_na)
+
+    def test_median(self, float_frame_with_na, int_frame):
+        def wrapper(x):
+            if isna(x).any():
+                return np.nan
+            return np.median(x)
+
+        assert_stat_op_calc("median", wrapper, float_frame_with_na, check_dates=True)
+        assert_stat_op_calc(
+            "median", wrapper, int_frame, check_dtype=False, check_dates=True
+        )
+
+    @pytest.mark.parametrize(
+        "method", ["sum", "mean", "prod", "var", "std", "skew", "min", "max"]
+    )
+    @pytest.mark.parametrize(
+        "df",
+        [
+            DataFrame(
+                {
+                    "a": [
+                        -0.00049987540199591344,
+                        -0.0016467257772919831,
+                        0.00067695870775883013,
+                    ],
+                    "b": [-0, -0, 0.0],
+                    "c": [
+                        0.00031111847529610595,
+                        0.0014902627951905339,
+                        -0.00094099200035979691,
+                    ],
+                },
+                index=["foo", "bar", "baz"],
+                dtype="O",
+            ),
+            DataFrame({0: [np.nan, 2], 1: [np.nan, 3], 2: [np.nan, 4]}, dtype=object),
+        ],
+    )
+    @pytest.mark.filterwarnings("ignore:Mismatched null-like values:FutureWarning")
+    def test_stat_operators_attempt_obj_array(self, method, df, axis):
+        # GH#676
+        assert df.values.dtype == np.object_
+        result = getattr(df, method)(axis=axis)
+        expected = getattr(df.astype("f8"), method)(axis=axis).astype(object)
+        if axis in [1, "columns"] and method in ["min", "max"]:
+            expected[expected.isna()] = None
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("op", ["mean", "std", "var", "skew", "kurt", "sem"])
+    def test_mixed_ops(self, op):
+        # GH#16116
+        df = DataFrame(
+            {
+                "int": [1, 2, 3, 4],
+                "float": [1.0, 2.0, 3.0, 4.0],
+                "str": ["a", "b", "c", "d"],
+            }
+        )
+        msg = "|".join(
+            [
+                "Could not convert",
+                "could not convert",
+                "can't multiply sequence by non-int",
+                "does not support",
+            ]
+        )
+        with pytest.raises(TypeError, match=msg):
+            getattr(df, op)()
+
+        with pd.option_context("use_bottleneck", False):
+            msg = "|".join(
+                [
+                    "Could not convert",
+                    "could not convert",
+                    "can't multiply sequence by non-int",
+                    "does not support",
+                ]
+            )
+            with pytest.raises(TypeError, match=msg):
+                getattr(df, op)()
+
+    @pytest.mark.xfail(
+        using_pyarrow_string_dtype(), reason="sum doesn't work for arrow strings"
+    )
+    def test_reduce_mixed_frame(self):
+        # GH 6806
+        df = DataFrame(
+            {
+                "bool_data": [True, True, False, False, False],
+                "int_data": [10, 20, 30, 40, 50],
+                "string_data": ["a", "b", "c", "d", "e"],
+            }
+        )
+        df.reindex(columns=["bool_data", "int_data", "string_data"])
+        test = df.sum(axis=0)
+        tm.assert_numpy_array_equal(
+            test.values, np.array([2, 150, "abcde"], dtype=object)
+        )
+        alt = df.T.sum(axis=1)
+        tm.assert_series_equal(test, alt)
+
+    def test_nunique(self):
+        df = DataFrame({"A": [1, 1, 1], "B": [1, 2, 3], "C": [1, np.nan, 3]})
+        tm.assert_series_equal(df.nunique(), Series({"A": 1, "B": 3, "C": 2}))
+        tm.assert_series_equal(
+            df.nunique(dropna=False), Series({"A": 1, "B": 3, "C": 3})
+        )
+        tm.assert_series_equal(df.nunique(axis=1), Series({0: 1, 1: 2, 2: 2}))
+        tm.assert_series_equal(
+            df.nunique(axis=1, dropna=False), Series({0: 1, 1: 3, 2: 2})
+        )
+
+    @pytest.mark.parametrize("tz", [None, "UTC"])
+    def test_mean_mixed_datetime_numeric(self, tz):
+        # https://github.com/pandas-dev/pandas/issues/24752
+        df = DataFrame({"A": [1, 1], "B": [Timestamp("2000", tz=tz)] * 2})
+        result = df.mean()
+        expected = Series([1.0, Timestamp("2000", tz=tz)], index=["A", "B"])
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("tz", [None, "UTC"])
+    def test_mean_includes_datetimes(self, tz):
+        # https://github.com/pandas-dev/pandas/issues/24752
+        # Behavior in 0.24.0rc1 was buggy.
+        # As of 2.0 with numeric_only=None we do *not* drop datetime columns
+        df = DataFrame({"A": [Timestamp("2000", tz=tz)] * 2})
+        result = df.mean()
+
+        expected = Series([Timestamp("2000", tz=tz)], index=["A"])
+        tm.assert_series_equal(result, expected)
+
+    def test_mean_mixed_string_decimal(self):
+        # GH 11670
+        # possible bug when calculating mean of DataFrame?
+
+        d = [
+            {"A": 2, "B": None, "C": Decimal("628.00")},
+            {"A": 1, "B": None, "C": Decimal("383.00")},
+            {"A": 3, "B": None, "C": Decimal("651.00")},
+            {"A": 2, "B": None, "C": Decimal("575.00")},
+            {"A": 4, "B": None, "C": Decimal("1114.00")},
+            {"A": 1, "B": "TEST", "C": Decimal("241.00")},
+            {"A": 2, "B": None, "C": Decimal("572.00")},
+            {"A": 4, "B": None, "C": Decimal("609.00")},
+            {"A": 3, "B": None, "C": Decimal("820.00")},
+            {"A": 5, "B": None, "C": Decimal("1223.00")},
+        ]
+
+        df = DataFrame(d)
+
+        with pytest.raises(
+            TypeError, match="unsupported operand type|does not support"
+        ):
+            df.mean()
+        result = df[["A", "C"]].mean()
+        expected = Series([2.7, 681.6], index=["A", "C"], dtype=object)
+        tm.assert_series_equal(result, expected)
+
+    def test_var_std(self, datetime_frame):
+        result = datetime_frame.std(ddof=4)
+        expected = datetime_frame.apply(lambda x: x.std(ddof=4))
+        tm.assert_almost_equal(result, expected)
+
+        result = datetime_frame.var(ddof=4)
+        expected = datetime_frame.apply(lambda x: x.var(ddof=4))
+        tm.assert_almost_equal(result, expected)
+
+        arr = np.repeat(np.random.default_rng(2).random((1, 1000)), 1000, 0)
+        result = nanops.nanvar(arr, axis=0)
+        assert not (result < 0).any()
+
+        with pd.option_context("use_bottleneck", False):
+            result = nanops.nanvar(arr, axis=0)
+            assert not (result < 0).any()
+
+    @pytest.mark.parametrize("meth", ["sem", "var", "std"])
+    def test_numeric_only_flag(self, meth):
+        # GH 9201
+        df1 = DataFrame(
+            np.random.default_rng(2).standard_normal((5, 3)),
+            columns=["foo", "bar", "baz"],
+        )
+        # Cast to object to avoid implicit cast when setting entry to "100" below
+        df1 = df1.astype({"foo": object})
+        # set one entry to a number in str format
+        df1.loc[0, "foo"] = "100"
+
+        df2 = DataFrame(
+            np.random.default_rng(2).standard_normal((5, 3)),
+            columns=["foo", "bar", "baz"],
+        )
+        # Cast to object to avoid implicit cast when setting entry to "a" below
+        df2 = df2.astype({"foo": object})
+        # set one entry to a non-number str
+        df2.loc[0, "foo"] = "a"
+
+        result = getattr(df1, meth)(axis=1, numeric_only=True)
+        expected = getattr(df1[["bar", "baz"]], meth)(axis=1)
+        tm.assert_series_equal(expected, result)
+
+        result = getattr(df2, meth)(axis=1, numeric_only=True)
+        expected = getattr(df2[["bar", "baz"]], meth)(axis=1)
+        tm.assert_series_equal(expected, result)
+
+        # df1 has all numbers, df2 has a letter inside
+        msg = r"unsupported operand type\(s\) for -: 'float' and 'str'"
+        with pytest.raises(TypeError, match=msg):
+            getattr(df1, meth)(axis=1, numeric_only=False)
+        msg = "could not convert string to float: 'a'"
+        with pytest.raises(TypeError, match=msg):
+            getattr(df2, meth)(axis=1, numeric_only=False)
+
+    def test_sem(self, datetime_frame):
+        result = datetime_frame.sem(ddof=4)
+        expected = datetime_frame.apply(lambda x: x.std(ddof=4) / np.sqrt(len(x)))
+        tm.assert_almost_equal(result, expected)
+
+        arr = np.repeat(np.random.default_rng(2).random((1, 1000)), 1000, 0)
+        result = nanops.nansem(arr, axis=0)
+        assert not (result < 0).any()
+
+        with pd.option_context("use_bottleneck", False):
+            result = nanops.nansem(arr, axis=0)
+            assert not (result < 0).any()
+
+    @pytest.mark.parametrize(
+        "dropna, expected",
+        [
+            (
+                True,
+                {
+                    "A": [12],
+                    "B": [10.0],
+                    "C": [1.0],
+                    "D": ["a"],
+                    "E": Categorical(["a"], categories=["a"]),
+                    "F": DatetimeIndex(["2000-01-02"], dtype="M8[ns]"),
+                    "G": to_timedelta(["1 days"]),
+                },
+            ),
+            (
+                False,
+                {
+                    "A": [12],
+                    "B": [10.0],
+                    "C": [np.nan],
+                    "D": np.array([np.nan], dtype=object),
+                    "E": Categorical([np.nan], categories=["a"]),
+                    "F": DatetimeIndex([pd.NaT], dtype="M8[ns]"),
+                    "G": to_timedelta([pd.NaT]),
+                },
+            ),
+            (
+                True,
+                {
+                    "H": [8, 9, np.nan, np.nan],
+                    "I": [8, 9, np.nan, np.nan],
+                    "J": [1, np.nan, np.nan, np.nan],
+                    "K": Categorical(["a", np.nan, np.nan, np.nan], categories=["a"]),
+                    "L": DatetimeIndex(
+                        ["2000-01-02", "NaT", "NaT", "NaT"], dtype="M8[ns]"
+                    ),
+                    "M": to_timedelta(["1 days", "nan", "nan", "nan"]),
+                    "N": [0, 1, 2, 3],
+                },
+            ),
+            (
+                False,
+                {
+                    "H": [8, 9, np.nan, np.nan],
+                    "I": [8, 9, np.nan, np.nan],
+                    "J": [1, np.nan, np.nan, np.nan],
+                    "K": Categorical([np.nan, "a", np.nan, np.nan], categories=["a"]),
+                    "L": DatetimeIndex(
+                        ["NaT", "2000-01-02", "NaT", "NaT"], dtype="M8[ns]"
+                    ),
+                    "M": to_timedelta(["nan", "1 days", "nan", "nan"]),
+                    "N": [0, 1, 2, 3],
+                },
+            ),
+        ],
+    )
+    def test_mode_dropna(self, dropna, expected):
+        df = DataFrame(
+            {
+                "A": [12, 12, 19, 11],
+                "B": [10, 10, np.nan, 3],
+                "C": [1, np.nan, np.nan, np.nan],
+                "D": Series([np.nan, np.nan, "a", np.nan], dtype=object),
+                "E": Categorical([np.nan, np.nan, "a", np.nan]),
+                "F": DatetimeIndex(["NaT", "2000-01-02", "NaT", "NaT"], dtype="M8[ns]"),
+                "G": to_timedelta(["1 days", "nan", "nan", "nan"]),
+                "H": [8, 8, 9, 9],
+                "I": [9, 9, 8, 8],
+                "J": [1, 1, np.nan, np.nan],
+                "K": Categorical(["a", np.nan, "a", np.nan]),
+                "L": DatetimeIndex(
+                    ["2000-01-02", "2000-01-02", "NaT", "NaT"], dtype="M8[ns]"
+                ),
+                "M": to_timedelta(["1 days", "nan", "1 days", "nan"]),
+                "N": np.arange(4, dtype="int64"),
+            }
+        )
+
+        result = df[sorted(expected.keys())].mode(dropna=dropna)
+        expected = DataFrame(expected)
+        tm.assert_frame_equal(result, expected)
+
+    def test_mode_sortwarning(self, using_infer_string):
+        # Check for the warning that is raised when the mode
+        # results cannot be sorted
+
+        df = DataFrame({"A": [np.nan, np.nan, "a", "a"]})
+        expected = DataFrame({"A": ["a", np.nan]})
+
+        warning = None if using_infer_string else UserWarning
+        with tm.assert_produces_warning(warning):
+            result = df.mode(dropna=False)
+            result = result.sort_values(by="A").reset_index(drop=True)
+
+        tm.assert_frame_equal(result, expected)
+
+    def test_mode_empty_df(self):
+        df = DataFrame([], columns=["a", "b"])
+        result = df.mode()
+        expected = DataFrame([], columns=["a", "b"], index=Index([], dtype=np.int64))
+        tm.assert_frame_equal(result, expected)
+
+    def test_operators_timedelta64(self):
+        df = DataFrame(
+            {
+                "A": date_range("2012-1-1", periods=3, freq="D"),
+                "B": date_range("2012-1-2", periods=3, freq="D"),
+                "C": Timestamp("20120101") - timedelta(minutes=5, seconds=5),
+            }
+        )
+
+        diffs = DataFrame({"A": df["A"] - df["C"], "B": df["A"] - df["B"]})
+
+        # min
+        result = diffs.min()
+        assert result.iloc[0] == diffs.loc[0, "A"]
+        assert result.iloc[1] == diffs.loc[0, "B"]
+
+        result = diffs.min(axis=1)
+        assert (result == diffs.loc[0, "B"]).all()
+
+        # max
+        result = diffs.max()
+        assert result.iloc[0] == diffs.loc[2, "A"]
+        assert result.iloc[1] == diffs.loc[2, "B"]
+
+        result = diffs.max(axis=1)
+        assert (result == diffs["A"]).all()
+
+        # abs
+        result = diffs.abs()
+        result2 = abs(diffs)
+        expected = DataFrame({"A": df["A"] - df["C"], "B": df["B"] - df["A"]})
+        tm.assert_frame_equal(result, expected)
+        tm.assert_frame_equal(result2, expected)
+
+        # mixed frame
+        mixed = diffs.copy()
+        mixed["C"] = "foo"
+        mixed["D"] = 1
+        mixed["E"] = 1.0
+        mixed["F"] = Timestamp("20130101")
+
+        # results in an object array
+        result = mixed.min()
+        expected = Series(
+            [
+                pd.Timedelta(timedelta(seconds=5 * 60 + 5)),
+                pd.Timedelta(timedelta(days=-1)),
+                "foo",
+                1,
+                1.0,
+                Timestamp("20130101"),
+            ],
+            index=mixed.columns,
+        )
+        tm.assert_series_equal(result, expected)
+
+        # excludes non-numeric
+        result = mixed.min(axis=1, numeric_only=True)
+        expected = Series([1, 1, 1.0], index=[0, 1, 2])
+        tm.assert_series_equal(result, expected)
+
+        # works when only those columns are selected
+        result = mixed[["A", "B"]].min(1)
+        expected = Series([timedelta(days=-1)] * 3)
+        tm.assert_series_equal(result, expected)
+
+        result = mixed[["A", "B"]].min()
+        expected = Series(
+            [timedelta(seconds=5 * 60 + 5), timedelta(days=-1)], index=["A", "B"]
+        )
+        tm.assert_series_equal(result, expected)
+
+        # GH 3106
+        df = DataFrame(
+            {
+                "time": date_range("20130102", periods=5),
+                "time2": date_range("20130105", periods=5),
+            }
+        )
+        df["off1"] = df["time2"] - df["time"]
+        assert df["off1"].dtype == "timedelta64[ns]"
+
+        df["off2"] = df["time"] - df["time2"]
+        df._consolidate_inplace()
+        assert df["off1"].dtype == "timedelta64[ns]"
+        assert df["off2"].dtype == "timedelta64[ns]"
+
+    def test_std_timedelta64_skipna_false(self):
+        # GH#37392
+        tdi = pd.timedelta_range("1 Day", periods=10)
+        df = DataFrame({"A": tdi, "B": tdi}, copy=True)
+        df.iloc[-2, -1] = pd.NaT
+
+        result = df.std(skipna=False)
+        expected = Series(
+            [df["A"].std(), pd.NaT], index=["A", "B"], dtype="timedelta64[ns]"
+        )
+        tm.assert_series_equal(result, expected)
+
+        result = df.std(axis=1, skipna=False)
+        expected = Series([pd.Timedelta(0)] * 8 + [pd.NaT, pd.Timedelta(0)])
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "values", [["2022-01-01", "2022-01-02", pd.NaT, "2022-01-03"], 4 * [pd.NaT]]
+    )
+    def test_std_datetime64_with_nat(
+        self, values, skipna, using_array_manager, request, unit
+    ):
+        # GH#51335
+        if using_array_manager and (
+            not skipna or all(value is pd.NaT for value in values)
+        ):
+            mark = pytest.mark.xfail(
+                reason="GH#51446: Incorrect type inference on NaT in reduction result"
+            )
+            request.applymarker(mark)
+        dti = to_datetime(values).as_unit(unit)
+        df = DataFrame({"a": dti})
+        result = df.std(skipna=skipna)
+        if not skipna or all(value is pd.NaT for value in values):
+            expected = Series({"a": pd.NaT}, dtype=f"timedelta64[{unit}]")
+        else:
+            # 86400000000000ns == 1 day
+            expected = Series({"a": 86400000000000}, dtype=f"timedelta64[{unit}]")
+        tm.assert_series_equal(result, expected)
+
+    def test_sum_corner(self):
+        empty_frame = DataFrame()
+
+        axis0 = empty_frame.sum(0)
+        axis1 = empty_frame.sum(1)
+        assert isinstance(axis0, Series)
+        assert isinstance(axis1, Series)
+        assert len(axis0) == 0
+        assert len(axis1) == 0
+
+    @pytest.mark.parametrize(
+        "index",
+        [
+            RangeIndex(0),
+            DatetimeIndex([]),
+            Index([], dtype=np.int64),
+            Index([], dtype=np.float64),
+            DatetimeIndex([], freq="ME"),
+            PeriodIndex([], freq="D"),
+        ],
+    )
+    def test_axis_1_empty(self, all_reductions, index):
+        df = DataFrame(columns=["a"], index=index)
+        result = getattr(df, all_reductions)(axis=1)
+        if all_reductions in ("any", "all"):
+            expected_dtype = "bool"
+        elif all_reductions == "count":
+            expected_dtype = "int64"
+        else:
+            expected_dtype = "object"
+        expected = Series([], index=index, dtype=expected_dtype)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("method, unit", [("sum", 0), ("prod", 1)])
+    @pytest.mark.parametrize("numeric_only", [None, True, False])
+    def test_sum_prod_nanops(self, method, unit, numeric_only):
+        idx = ["a", "b", "c"]
+        df = DataFrame({"a": [unit, unit], "b": [unit, np.nan], "c": [np.nan, np.nan]})
+        # The default
+        result = getattr(df, method)(numeric_only=numeric_only)
+        expected = Series([unit, unit, unit], index=idx, dtype="float64")
+        tm.assert_series_equal(result, expected)
+
+        # min_count=1
+        result = getattr(df, method)(numeric_only=numeric_only, min_count=1)
+        expected = Series([unit, unit, np.nan], index=idx)
+        tm.assert_series_equal(result, expected)
+
+        # min_count=0
+        result = getattr(df, method)(numeric_only=numeric_only, min_count=0)
+        expected = Series([unit, unit, unit], index=idx, dtype="float64")
+        tm.assert_series_equal(result, expected)
+
+        result = getattr(df.iloc[1:], method)(numeric_only=numeric_only, min_count=1)
+        expected = Series([unit, np.nan, np.nan], index=idx)
+        tm.assert_series_equal(result, expected)
+
+        # min_count > 1
+        df = DataFrame({"A": [unit] * 10, "B": [unit] * 5 + [np.nan] * 5})
+        result = getattr(df, method)(numeric_only=numeric_only, min_count=5)
+        expected = Series(result, index=["A", "B"])
+        tm.assert_series_equal(result, expected)
+
+        result = getattr(df, method)(numeric_only=numeric_only, min_count=6)
+        expected = Series(result, index=["A", "B"])
+        tm.assert_series_equal(result, expected)
+
+    def test_sum_nanops_timedelta(self):
+        # prod isn't defined on timedeltas
+        idx = ["a", "b", "c"]
+        df = DataFrame({"a": [0, 0], "b": [0, np.nan], "c": [np.nan, np.nan]})
+
+        df2 = df.apply(to_timedelta)
+
+        # 0 by default
+        result = df2.sum()
+        expected = Series([0, 0, 0], dtype="m8[ns]", index=idx)
+        tm.assert_series_equal(result, expected)
+
+        # min_count=0
+        result = df2.sum(min_count=0)
+        tm.assert_series_equal(result, expected)
+
+        # min_count=1
+        result = df2.sum(min_count=1)
+        expected = Series([0, 0, np.nan], dtype="m8[ns]", index=idx)
+        tm.assert_series_equal(result, expected)
+
+    def test_sum_nanops_min_count(self):
+        # https://github.com/pandas-dev/pandas/issues/39738
+        df = DataFrame({"x": [1, 2, 3], "y": [4, 5, 6]})
+        result = df.sum(min_count=10)
+        expected = Series([np.nan, np.nan], index=["x", "y"])
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("float_type", ["float16", "float32", "float64"])
+    @pytest.mark.parametrize(
+        "kwargs, expected_result",
+        [
+            ({"axis": 1, "min_count": 2}, [3.2, 5.3, np.nan]),
+            ({"axis": 1, "min_count": 3}, [np.nan, np.nan, np.nan]),
+            ({"axis": 1, "skipna": False}, [3.2, 5.3, np.nan]),
+        ],
+    )
+    def test_sum_nanops_dtype_min_count(self, float_type, kwargs, expected_result):
+        # GH#46947
+        df = DataFrame({"a": [1.0, 2.3, 4.4], "b": [2.2, 3, np.nan]}, dtype=float_type)
+        result = df.sum(**kwargs)
+        expected = Series(expected_result).astype(float_type)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("float_type", ["float16", "float32", "float64"])
+    @pytest.mark.parametrize(
+        "kwargs, expected_result",
+        [
+            ({"axis": 1, "min_count": 2}, [2.0, 4.0, np.nan]),
+            ({"axis": 1, "min_count": 3}, [np.nan, np.nan, np.nan]),
+            ({"axis": 1, "skipna": False}, [2.0, 4.0, np.nan]),
+        ],
+    )
+    def test_prod_nanops_dtype_min_count(self, float_type, kwargs, expected_result):
+        # GH#46947
+        df = DataFrame(
+            {"a": [1.0, 2.0, 4.4], "b": [2.0, 2.0, np.nan]}, dtype=float_type
+        )
+        result = df.prod(**kwargs)
+        expected = Series(expected_result).astype(float_type)
+        tm.assert_series_equal(result, expected)
+
+    def test_sum_object(self, float_frame):
+        values = float_frame.values.astype(int)
+        frame = DataFrame(values, index=float_frame.index, columns=float_frame.columns)
+        deltas = frame * timedelta(1)
+        deltas.sum()
+
+    def test_sum_bool(self, float_frame):
+        # ensure this works, bug report
+        bools = np.isnan(float_frame)
+        bools.sum(1)
+        bools.sum(0)
+
+    def test_sum_mixed_datetime(self):
+        # GH#30886
+        df = DataFrame({"A": date_range("2000", periods=4), "B": [1, 2, 3, 4]}).reindex(
+            [2, 3, 4]
+        )
+        with pytest.raises(TypeError, match="does not support reduction 'sum'"):
+            df.sum()
+
+    def test_mean_corner(self, float_frame, float_string_frame):
+        # unit test when have object data
+        msg = "Could not convert|does not support"
+        with pytest.raises(TypeError, match=msg):
+            float_string_frame.mean(axis=0)
+
+        # xs sum mixed type, just want to know it works...
+        with pytest.raises(TypeError, match="unsupported operand type"):
+            float_string_frame.mean(axis=1)
+
+        # take mean of boolean column
+        float_frame["bool"] = float_frame["A"] > 0
+        means = float_frame.mean(0)
+        assert means["bool"] == float_frame["bool"].values.mean()
+
+    def test_mean_datetimelike(self):
+        # GH#24757 check that datetimelike are excluded by default, handled
+        #  correctly with numeric_only=True
+        #  As of 2.0, datetimelike are *not* excluded with numeric_only=None
+
+        df = DataFrame(
+            {
+                "A": np.arange(3),
+                "B": date_range("2016-01-01", periods=3),
+                "C": pd.timedelta_range("1D", periods=3),
+                "D": pd.period_range("2016", periods=3, freq="Y"),
+            }
+        )
+        result = df.mean(numeric_only=True)
+        expected = Series({"A": 1.0})
+        tm.assert_series_equal(result, expected)
+
+        with pytest.raises(TypeError, match="mean is not implemented for PeriodArray"):
+            df.mean()
+
+    def test_mean_datetimelike_numeric_only_false(self):
+        df = DataFrame(
+            {
+                "A": np.arange(3),
+                "B": date_range("2016-01-01", periods=3),
+                "C": pd.timedelta_range("1D", periods=3),
+            }
+        )
+
+        # datetime(tz) and timedelta work
+        result = df.mean(numeric_only=False)
+        expected = Series({"A": 1, "B": df.loc[1, "B"], "C": df.loc[1, "C"]})
+        tm.assert_series_equal(result, expected)
+
+        # mean of period is not allowed
+        df["D"] = pd.period_range("2016", periods=3, freq="Y")
+
+        with pytest.raises(TypeError, match="mean is not implemented for Period"):
+            df.mean(numeric_only=False)
+
+    def test_mean_extensionarray_numeric_only_true(self):
+        # https://github.com/pandas-dev/pandas/issues/33256
+        arr = np.random.default_rng(2).integers(1000, size=(10, 5))
+        df = DataFrame(arr, dtype="Int64")
+        result = df.mean(numeric_only=True)
+        expected = DataFrame(arr).mean().astype("Float64")
+        tm.assert_series_equal(result, expected)
+
+    def test_stats_mixed_type(self, float_string_frame):
+        with pytest.raises(TypeError, match="could not convert"):
+            float_string_frame.std(1)
+        with pytest.raises(TypeError, match="could not convert"):
+            float_string_frame.var(1)
+        with pytest.raises(TypeError, match="unsupported operand type"):
+            float_string_frame.mean(1)
+        with pytest.raises(TypeError, match="could not convert"):
+            float_string_frame.skew(1)
+
+    def test_sum_bools(self):
+        df = DataFrame(index=range(1), columns=range(10))
+        bools = isna(df)
+        assert bools.sum(axis=1)[0] == 10
+
+    # ----------------------------------------------------------------------
+    # Index of max / min
+
+    @pytest.mark.parametrize("skipna", [True, False])
+    @pytest.mark.parametrize("axis", [0, 1])
+    def test_idxmin(self, float_frame, int_frame, skipna, axis):
+        frame = float_frame
+        frame.iloc[5:10] = np.nan
+        frame.iloc[15:20, -2:] = np.nan
+        for df in [frame, int_frame]:
+            warn = None
+            if skipna is False or axis == 1:
+                warn = None if df is int_frame else FutureWarning
+            msg = "The behavior of DataFrame.idxmin with all-NA values"
+            with tm.assert_produces_warning(warn, match=msg):
+                result = df.idxmin(axis=axis, skipna=skipna)
+
+            msg2 = "The behavior of Series.idxmin"
+            with tm.assert_produces_warning(warn, match=msg2):
+                expected = df.apply(Series.idxmin, axis=axis, skipna=skipna)
+            expected = expected.astype(df.index.dtype)
+            tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("axis", [0, 1])
+    @pytest.mark.filterwarnings(r"ignore:PeriodDtype\[B\] is deprecated:FutureWarning")
+    def test_idxmin_empty(self, index, skipna, axis):
+        # GH53265
+        if axis == 0:
+            frame = DataFrame(index=index)
+        else:
+            frame = DataFrame(columns=index)
+
+        result = frame.idxmin(axis=axis, skipna=skipna)
+        expected = Series(dtype=index.dtype)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("numeric_only", [True, False])
+    def test_idxmin_numeric_only(self, numeric_only):
+        df = DataFrame({"a": [2, 3, 1], "b": [2, 1, 1], "c": list("xyx")})
+        result = df.idxmin(numeric_only=numeric_only)
+        if numeric_only:
+            expected = Series([2, 1], index=["a", "b"])
+        else:
+            expected = Series([2, 1, 0], index=["a", "b", "c"])
+        tm.assert_series_equal(result, expected)
+
+    def test_idxmin_axis_2(self, float_frame):
+        frame = float_frame
+        msg = "No axis named 2 for object type DataFrame"
+        with pytest.raises(ValueError, match=msg):
+            frame.idxmin(axis=2)
+
+    @pytest.mark.parametrize("skipna", [True, False])
+    @pytest.mark.parametrize("axis", [0, 1])
+    def test_idxmax(self, float_frame, int_frame, skipna, axis):
+        frame = float_frame
+        frame.iloc[5:10] = np.nan
+        frame.iloc[15:20, -2:] = np.nan
+        for df in [frame, int_frame]:
+            warn = None
+            if skipna is False or axis == 1:
+                warn = None if df is int_frame else FutureWarning
+            msg = "The behavior of DataFrame.idxmax with all-NA values"
+            with tm.assert_produces_warning(warn, match=msg):
+                result = df.idxmax(axis=axis, skipna=skipna)
+
+            msg2 = "The behavior of Series.idxmax"
+            with tm.assert_produces_warning(warn, match=msg2):
+                expected = df.apply(Series.idxmax, axis=axis, skipna=skipna)
+            expected = expected.astype(df.index.dtype)
+            tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("axis", [0, 1])
+    @pytest.mark.filterwarnings(r"ignore:PeriodDtype\[B\] is deprecated:FutureWarning")
+    def test_idxmax_empty(self, index, skipna, axis):
+        # GH53265
+        if axis == 0:
+            frame = DataFrame(index=index)
+        else:
+            frame = DataFrame(columns=index)
+
+        result = frame.idxmax(axis=axis, skipna=skipna)
+        expected = Series(dtype=index.dtype)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("numeric_only", [True, False])
+    def test_idxmax_numeric_only(self, numeric_only):
+        df = DataFrame({"a": [2, 3, 1], "b": [2, 1, 1], "c": list("xyx")})
+        result = df.idxmax(numeric_only=numeric_only)
+        if numeric_only:
+            expected = Series([1, 0], index=["a", "b"])
+        else:
+            expected = Series([1, 0, 1], index=["a", "b", "c"])
+        tm.assert_series_equal(result, expected)
+
+    def test_idxmax_arrow_types(self):
+        # GH#55368
+        pytest.importorskip("pyarrow")
+
+        df = DataFrame({"a": [2, 3, 1], "b": [2, 1, 1]}, dtype="int64[pyarrow]")
+        result = df.idxmax()
+        expected = Series([1, 0], index=["a", "b"])
+        tm.assert_series_equal(result, expected)
+
+        result = df.idxmin()
+        expected = Series([2, 1], index=["a", "b"])
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame({"a": ["b", "c", "a"]}, dtype="string[pyarrow]")
+        result = df.idxmax(numeric_only=False)
+        expected = Series([1], index=["a"])
+        tm.assert_series_equal(result, expected)
+
+        result = df.idxmin(numeric_only=False)
+        expected = Series([2], index=["a"])
+        tm.assert_series_equal(result, expected)
+
+    def test_idxmax_axis_2(self, float_frame):
+        frame = float_frame
+        msg = "No axis named 2 for object type DataFrame"
+        with pytest.raises(ValueError, match=msg):
+            frame.idxmax(axis=2)
+
+    def test_idxmax_mixed_dtype(self):
+        # don't cast to object, which would raise in nanops
+        dti = date_range("2016-01-01", periods=3)
+
+        # Copying dti is needed for ArrayManager otherwise when we set
+        #  df.loc[0, 3] = pd.NaT below it edits dti
+        df = DataFrame({1: [0, 2, 1], 2: range(3)[::-1], 3: dti.copy(deep=True)})
+
+        result = df.idxmax()
+        expected = Series([1, 0, 2], index=[1, 2, 3])
+        tm.assert_series_equal(result, expected)
+
+        result = df.idxmin()
+        expected = Series([0, 2, 0], index=[1, 2, 3])
+        tm.assert_series_equal(result, expected)
+
+        # with NaTs
+        df.loc[0, 3] = pd.NaT
+        result = df.idxmax()
+        expected = Series([1, 0, 2], index=[1, 2, 3])
+        tm.assert_series_equal(result, expected)
+
+        result = df.idxmin()
+        expected = Series([0, 2, 1], index=[1, 2, 3])
+        tm.assert_series_equal(result, expected)
+
+        # with multi-column dt64 block
+        df[4] = dti[::-1]
+        df._consolidate_inplace()
+
+        result = df.idxmax()
+        expected = Series([1, 0, 2, 0], index=[1, 2, 3, 4])
+        tm.assert_series_equal(result, expected)
+
+        result = df.idxmin()
+        expected = Series([0, 2, 1, 2], index=[1, 2, 3, 4])
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "op, expected_value",
+        [("idxmax", [0, 4]), ("idxmin", [0, 5])],
+    )
+    def test_idxmax_idxmin_convert_dtypes(self, op, expected_value):
+        # GH 40346
+        df = DataFrame(
+            {
+                "ID": [100, 100, 100, 200, 200, 200],
+                "value": [0, 0, 0, 1, 2, 0],
+            },
+            dtype="Int64",
+        )
+        df = df.groupby("ID")
+
+        result = getattr(df, op)()
+        expected = DataFrame(
+            {"value": expected_value},
+            index=Index([100, 200], name="ID", dtype="Int64"),
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_idxmax_dt64_multicolumn_axis1(self):
+        dti = date_range("2016-01-01", periods=3)
+        df = DataFrame({3: dti, 4: dti[::-1]}, copy=True)
+        df.iloc[0, 0] = pd.NaT
+
+        df._consolidate_inplace()
+
+        result = df.idxmax(axis=1)
+        expected = Series([4, 3, 3])
+        tm.assert_series_equal(result, expected)
+
+        result = df.idxmin(axis=1)
+        expected = Series([4, 3, 4])
+        tm.assert_series_equal(result, expected)
+
+    # ----------------------------------------------------------------------
+    # Logical reductions
+
+    @pytest.mark.parametrize("opname", ["any", "all"])
+    @pytest.mark.parametrize("axis", [0, 1])
+    @pytest.mark.parametrize("bool_only", [False, True])
+    def test_any_all_mixed_float(self, opname, axis, bool_only, float_string_frame):
+        # make sure op works on mixed-type frame
+        mixed = float_string_frame
+        mixed["_bool_"] = np.random.default_rng(2).standard_normal(len(mixed)) > 0.5
+
+        getattr(mixed, opname)(axis=axis, bool_only=bool_only)
+
+    @pytest.mark.parametrize("opname", ["any", "all"])
+    @pytest.mark.parametrize("axis", [0, 1])
+    def test_any_all_bool_with_na(self, opname, axis, bool_frame_with_na):
+        getattr(bool_frame_with_na, opname)(axis=axis, bool_only=False)
+
+    @pytest.mark.filterwarnings("ignore:Downcasting object dtype arrays:FutureWarning")
+    @pytest.mark.parametrize("opname", ["any", "all"])
+    def test_any_all_bool_frame(self, opname, bool_frame_with_na):
+        # GH#12863: numpy gives back non-boolean data for object type
+        # so fill NaNs to compare with pandas behavior
+        frame = bool_frame_with_na.fillna(True)
+        alternative = getattr(np, opname)
+        f = getattr(frame, opname)
+
+        def skipna_wrapper(x):
+            nona = x.dropna().values
+            return alternative(nona)
+
+        def wrapper(x):
+            return alternative(x.values)
+
+        result0 = f(axis=0, skipna=False)
+        result1 = f(axis=1, skipna=False)
+
+        tm.assert_series_equal(result0, frame.apply(wrapper))
+        tm.assert_series_equal(result1, frame.apply(wrapper, axis=1))
+
+        result0 = f(axis=0)
+        result1 = f(axis=1)
+
+        tm.assert_series_equal(result0, frame.apply(skipna_wrapper))
+        tm.assert_series_equal(
+            result1, frame.apply(skipna_wrapper, axis=1), check_dtype=False
+        )
+
+        # bad axis
+        with pytest.raises(ValueError, match="No axis named 2"):
+            f(axis=2)
+
+        # all NA case
+        all_na = frame * np.nan
+        r0 = getattr(all_na, opname)(axis=0)
+        r1 = getattr(all_na, opname)(axis=1)
+        if opname == "any":
+            assert not r0.any()
+            assert not r1.any()
+        else:
+            assert r0.all()
+            assert r1.all()
+
+    def test_any_all_extra(self):
+        df = DataFrame(
+            {
+                "A": [True, False, False],
+                "B": [True, True, False],
+                "C": [True, True, True],
+            },
+            index=["a", "b", "c"],
+        )
+        result = df[["A", "B"]].any(axis=1)
+        expected = Series([True, True, False], index=["a", "b", "c"])
+        tm.assert_series_equal(result, expected)
+
+        result = df[["A", "B"]].any(axis=1, bool_only=True)
+        tm.assert_series_equal(result, expected)
+
+        result = df.all(1)
+        expected = Series([True, False, False], index=["a", "b", "c"])
+        tm.assert_series_equal(result, expected)
+
+        result = df.all(1, bool_only=True)
+        tm.assert_series_equal(result, expected)
+
+        # Axis is None
+        result = df.all(axis=None).item()
+        assert result is False
+
+        result = df.any(axis=None).item()
+        assert result is True
+
+        result = df[["C"]].all(axis=None).item()
+        assert result is True
+
+    @pytest.mark.parametrize("axis", [0, 1])
+    @pytest.mark.parametrize("bool_agg_func", ["any", "all"])
+    @pytest.mark.parametrize("skipna", [True, False])
+    def test_any_all_object_dtype(
+        self, axis, bool_agg_func, skipna, using_infer_string
+    ):
+        # GH#35450
+        df = DataFrame(
+            data=[
+                [1, np.nan, np.nan, True],
+                [np.nan, 2, np.nan, True],
+                [np.nan, np.nan, np.nan, True],
+                [np.nan, np.nan, "5", np.nan],
+            ]
+        )
+        if using_infer_string:
+            # na in object is True while in string pyarrow numpy it's false
+            val = not axis == 0 and not skipna and bool_agg_func == "all"
+        else:
+            val = True
+        result = getattr(df, bool_agg_func)(axis=axis, skipna=skipna)
+        expected = Series([True, True, val, True])
+        tm.assert_series_equal(result, expected)
+
+    # GH#50947 deprecates this but it is not emitting a warning in some builds.
+    @pytest.mark.filterwarnings(
+        "ignore:'any' with datetime64 dtypes is deprecated.*:FutureWarning"
+    )
+    def test_any_datetime(self):
+        # GH 23070
+        float_data = [1, np.nan, 3, np.nan]
+        datetime_data = [
+            Timestamp("1960-02-15"),
+            Timestamp("1960-02-16"),
+            pd.NaT,
+            pd.NaT,
+        ]
+        df = DataFrame({"A": float_data, "B": datetime_data})
+
+        result = df.any(axis=1)
+
+        expected = Series([True, True, True, False])
+        tm.assert_series_equal(result, expected)
+
+    def test_any_all_bool_only(self):
+        # GH 25101
+        df = DataFrame(
+            {"col1": [1, 2, 3], "col2": [4, 5, 6], "col3": [None, None, None]},
+            columns=Index(["col1", "col2", "col3"], dtype=object),
+        )
+
+        result = df.all(bool_only=True)
+        expected = Series(dtype=np.bool_, index=[])
+        tm.assert_series_equal(result, expected)
+
+        df = DataFrame(
+            {
+                "col1": [1, 2, 3],
+                "col2": [4, 5, 6],
+                "col3": [None, None, None],
+                "col4": [False, False, True],
+            }
+        )
+
+        result = df.all(bool_only=True)
+        expected = Series({"col4": False})
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "func, data, expected",
+        [
+            (np.any, {}, False),
+            (np.all, {}, True),
+            (np.any, {"A": []}, False),
+            (np.all, {"A": []}, True),
+            (np.any, {"A": [False, False]}, False),
+            (np.all, {"A": [False, False]}, False),
+            (np.any, {"A": [True, False]}, True),
+            (np.all, {"A": [True, False]}, False),
+            (np.any, {"A": [True, True]}, True),
+            (np.all, {"A": [True, True]}, True),
+            (np.any, {"A": [False], "B": [False]}, False),
+            (np.all, {"A": [False], "B": [False]}, False),
+            (np.any, {"A": [False, False], "B": [False, True]}, True),
+            (np.all, {"A": [False, False], "B": [False, True]}, False),
+            # other types
+            (np.all, {"A": Series([0.0, 1.0], dtype="float")}, False),
+            (np.any, {"A": Series([0.0, 1.0], dtype="float")}, True),
+            (np.all, {"A": Series([0, 1], dtype=int)}, False),
+            (np.any, {"A": Series([0, 1], dtype=int)}, True),
+            pytest.param(np.all, {"A": Series([0, 1], dtype="M8[ns]")}, False),
+            pytest.param(np.all, {"A": Series([0, 1], dtype="M8[ns, UTC]")}, False),
+            pytest.param(np.any, {"A": Series([0, 1], dtype="M8[ns]")}, True),
+            pytest.param(np.any, {"A": Series([0, 1], dtype="M8[ns, UTC]")}, True),
+            pytest.param(np.all, {"A": Series([1, 2], dtype="M8[ns]")}, True),
+            pytest.param(np.all, {"A": Series([1, 2], dtype="M8[ns, UTC]")}, True),
+            pytest.param(np.any, {"A": Series([1, 2], dtype="M8[ns]")}, True),
+            pytest.param(np.any, {"A": Series([1, 2], dtype="M8[ns, UTC]")}, True),
+            pytest.param(np.all, {"A": Series([0, 1], dtype="m8[ns]")}, False),
+            pytest.param(np.any, {"A": Series([0, 1], dtype="m8[ns]")}, True),
+            pytest.param(np.all, {"A": Series([1, 2], dtype="m8[ns]")}, True),
+            pytest.param(np.any, {"A": Series([1, 2], dtype="m8[ns]")}, True),
+            # np.all on Categorical raises, so the reduction drops the
+            #  column, so all is being done on an empty Series, so is True
+            (np.all, {"A": Series([0, 1], dtype="category")}, True),
+            (np.any, {"A": Series([0, 1], dtype="category")}, False),
+            (np.all, {"A": Series([1, 2], dtype="category")}, True),
+            (np.any, {"A": Series([1, 2], dtype="category")}, False),
+            # Mix GH#21484
+            pytest.param(
+                np.all,
+                {
+                    "A": Series([10, 20], dtype="M8[ns]"),
+                    "B": Series([10, 20], dtype="m8[ns]"),
+                },
+                True,
+            ),
+        ],
+    )
+    def test_any_all_np_func(self, func, data, expected):
+        # GH 19976
+        data = DataFrame(data)
+
+        if any(isinstance(x, CategoricalDtype) for x in data.dtypes):
+            with pytest.raises(
+                TypeError, match="dtype category does not support reduction"
+            ):
+                func(data)
+
+            # method version
+            with pytest.raises(
+                TypeError, match="dtype category does not support reduction"
+            ):
+                getattr(DataFrame(data), func.__name__)(axis=None)
+        else:
+            msg = "'(any|all)' with datetime64 dtypes is deprecated"
+            if data.dtypes.apply(lambda x: x.kind == "M").any():
+                warn = FutureWarning
+            else:
+                warn = None
+
+            with tm.assert_produces_warning(warn, match=msg, check_stacklevel=False):
+                # GH#34479
+                result = func(data)
+            assert isinstance(result, np.bool_)
+            assert result.item() is expected
+
+            # method version
+            with tm.assert_produces_warning(warn, match=msg):
+                # GH#34479
+                result = getattr(DataFrame(data), func.__name__)(axis=None)
+            assert isinstance(result, np.bool_)
+            assert result.item() is expected
+
+    def test_any_all_object(self):
+        # GH 19976
+        result = np.all(DataFrame(columns=["a", "b"])).item()
+        assert result is True
+
+        result = np.any(DataFrame(columns=["a", "b"])).item()
+        assert result is False
+
+    def test_any_all_object_bool_only(self):
+        df = DataFrame({"A": ["foo", 2], "B": [True, False]}).astype(object)
+        df._consolidate_inplace()
+        df["C"] = Series([True, True])
+
+        # Categorical of bools is _not_ considered booly
+        df["D"] = df["C"].astype("category")
+
+        # The underlying bug is in DataFrame._get_bool_data, so we check
+        #  that while we're here
+        res = df._get_bool_data()
+        expected = df[["C"]]
+        tm.assert_frame_equal(res, expected)
+
+        res = df.all(bool_only=True, axis=0)
+        expected = Series([True], index=["C"])
+        tm.assert_series_equal(res, expected)
+
+        # operating on a subset of columns should not produce a _larger_ Series
+        res = df[["B", "C"]].all(bool_only=True, axis=0)
+        tm.assert_series_equal(res, expected)
+
+        assert df.all(bool_only=True, axis=None)
+
+        res = df.any(bool_only=True, axis=0)
+        expected = Series([True], index=["C"])
+        tm.assert_series_equal(res, expected)
+
+        # operating on a subset of columns should not produce a _larger_ Series
+        res = df[["C"]].any(bool_only=True, axis=0)
+        tm.assert_series_equal(res, expected)
+
+        assert df.any(bool_only=True, axis=None)
+
+    # ---------------------------------------------------------------------
+    # Unsorted
+
+    def test_series_broadcasting(self):
+        # smoke test for numpy warnings
+        # GH 16378, GH 16306
+        df = DataFrame([1.0, 1.0, 1.0])
+        df_nan = DataFrame({"A": [np.nan, 2.0, np.nan]})
+        s = Series([1, 1, 1])
+        s_nan = Series([np.nan, np.nan, 1])
+
+        with tm.assert_produces_warning(None):
+            df_nan.clip(lower=s, axis=0)
+            for op in ["lt", "le", "gt", "ge", "eq", "ne"]:
+                getattr(df, op)(s_nan, axis=0)
+
+
+class TestDataFrameReductions:
+    def test_min_max_dt64_with_NaT(self):
+        # Both NaT and Timestamp are in DataFrame.
+        df = DataFrame({"foo": [pd.NaT, pd.NaT, Timestamp("2012-05-01")]})
+
+        res = df.min()
+        exp = Series([Timestamp("2012-05-01")], index=["foo"])
+        tm.assert_series_equal(res, exp)
+
+        res = df.max()
+        exp = Series([Timestamp("2012-05-01")], index=["foo"])
+        tm.assert_series_equal(res, exp)
+
+        # GH12941, only NaTs are in DataFrame.
+        df = DataFrame({"foo": [pd.NaT, pd.NaT]})
+
+        res = df.min()
+        exp = Series([pd.NaT], index=["foo"])
+        tm.assert_series_equal(res, exp)
+
+        res = df.max()
+        exp = Series([pd.NaT], index=["foo"])
+        tm.assert_series_equal(res, exp)
+
+    def test_min_max_dt64_with_NaT_skipna_false(self, request, tz_naive_fixture):
+        # GH#36907
+        tz = tz_naive_fixture
+        if isinstance(tz, tzlocal) and is_platform_windows():
+            pytest.skip(
+                "GH#37659 OSError raised within tzlocal bc Windows "
+                "chokes in times before 1970-01-01"
+            )
+
+        df = DataFrame(
+            {
+                "a": [
+                    Timestamp("2020-01-01 08:00:00", tz=tz),
+                    Timestamp("1920-02-01 09:00:00", tz=tz),
+                ],
+                "b": [Timestamp("2020-02-01 08:00:00", tz=tz), pd.NaT],
+            }
+        )
+        res = df.min(axis=1, skipna=False)
+        expected = Series([df.loc[0, "a"], pd.NaT])
+        assert expected.dtype == df["a"].dtype
+
+        tm.assert_series_equal(res, expected)
+
+        res = df.max(axis=1, skipna=False)
+        expected = Series([df.loc[0, "b"], pd.NaT])
+        assert expected.dtype == df["a"].dtype
+
+        tm.assert_series_equal(res, expected)
+
+    def test_min_max_dt64_api_consistency_with_NaT(self):
+        # Calling the following sum functions returned an error for dataframes but
+        # returned NaT for series. These tests check that the API is consistent in
+        # min/max calls on empty Series/DataFrames. See GH:33704 for more
+        # information
+        df = DataFrame({"x": to_datetime([])})
+        expected_dt_series = Series(to_datetime([]))
+        # check axis 0
+        assert (df.min(axis=0).x is pd.NaT) == (expected_dt_series.min() is pd.NaT)
+        assert (df.max(axis=0).x is pd.NaT) == (expected_dt_series.max() is pd.NaT)
+
+        # check axis 1
+        tm.assert_series_equal(df.min(axis=1), expected_dt_series)
+        tm.assert_series_equal(df.max(axis=1), expected_dt_series)
+
+    def test_min_max_dt64_api_consistency_empty_df(self):
+        # check DataFrame/Series api consistency when calling min/max on an empty
+        # DataFrame/Series.
+        df = DataFrame({"x": []})
+        expected_float_series = Series([], dtype=float)
+        # check axis 0
+        assert np.isnan(df.min(axis=0).x) == np.isnan(expected_float_series.min())
+        assert np.isnan(df.max(axis=0).x) == np.isnan(expected_float_series.max())
+        # check axis 1
+        tm.assert_series_equal(df.min(axis=1), expected_float_series)
+        tm.assert_series_equal(df.min(axis=1), expected_float_series)
+
+    @pytest.mark.parametrize(
+        "initial",
+        ["2018-10-08 13:36:45+00:00", "2018-10-08 13:36:45+03:00"],  # Non-UTC timezone
+    )
+    @pytest.mark.parametrize("method", ["min", "max"])
+    def test_preserve_timezone(self, initial: str, method):
+        # GH 28552
+        initial_dt = to_datetime(initial)
+        expected = Series([initial_dt])
+        df = DataFrame([expected])
+        result = getattr(df, method)(axis=1)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize("method", ["min", "max"])
+    def test_minmax_tzaware_skipna_axis_1(self, method, skipna):
+        # GH#51242
+        val = to_datetime("1900-01-01", utc=True)
+        df = DataFrame(
+            {"a": Series([pd.NaT, pd.NaT, val]), "b": Series([pd.NaT, val, val])}
+        )
+        op = getattr(df, method)
+        result = op(axis=1, skipna=skipna)
+        if skipna:
+            expected = Series([pd.NaT, val, val])
+        else:
+            expected = Series([pd.NaT, pd.NaT, val])
+        tm.assert_series_equal(result, expected)
+
+    def test_frame_any_with_timedelta(self):
+        # GH#17667
+        df = DataFrame(
+            {
+                "a": Series([0, 0]),
+                "t": Series([to_timedelta(0, "s"), to_timedelta(1, "ms")]),
+            }
+        )
+
+        result = df.any(axis=0)
+        expected = Series(data=[False, True], index=["a", "t"])
+        tm.assert_series_equal(result, expected)
+
+        result = df.any(axis=1)
+        expected = Series(data=[False, True])
+        tm.assert_series_equal(result, expected)
+
+    def test_reductions_skipna_none_raises(
+        self, request, frame_or_series, all_reductions
+    ):
+        if all_reductions == "count":
+            request.applymarker(
+                pytest.mark.xfail(reason="Count does not accept skipna")
+            )
+        obj = frame_or_series([1, 2, 3])
+        msg = 'For argument "skipna" expected type bool, received type NoneType.'
+        with pytest.raises(ValueError, match=msg):
+            getattr(obj, all_reductions)(skipna=None)
+
+    @td.skip_array_manager_invalid_test
+    def test_reduction_timestamp_smallest_unit(self):
+        # GH#52524
+        df = DataFrame(
+            {
+                "a": Series([Timestamp("2019-12-31")], dtype="datetime64[s]"),
+                "b": Series(
+                    [Timestamp("2019-12-31 00:00:00.123")], dtype="datetime64[ms]"
+                ),
+            }
+        )
+        result = df.max()
+        expected = Series(
+            [Timestamp("2019-12-31"), Timestamp("2019-12-31 00:00:00.123")],
+            dtype="datetime64[ms]",
+            index=["a", "b"],
+        )
+        tm.assert_series_equal(result, expected)
+
+    @td.skip_array_manager_not_yet_implemented
+    def test_reduction_timedelta_smallest_unit(self):
+        # GH#52524
+        df = DataFrame(
+            {
+                "a": Series([pd.Timedelta("1 days")], dtype="timedelta64[s]"),
+                "b": Series([pd.Timedelta("1 days")], dtype="timedelta64[ms]"),
+            }
+        )
+        result = df.max()
+        expected = Series(
+            [pd.Timedelta("1 days"), pd.Timedelta("1 days")],
+            dtype="timedelta64[ms]",
+            index=["a", "b"],
+        )
+        tm.assert_series_equal(result, expected)
+
+
+class TestNuisanceColumns:
+    @pytest.mark.parametrize("method", ["any", "all"])
+    def test_any_all_categorical_dtype_nuisance_column(self, method):
+        # GH#36076 DataFrame should match Series behavior
+        ser = Series([0, 1], dtype="category", name="A")
+        df = ser.to_frame()
+
+        # Double-check the Series behavior is to raise
+        with pytest.raises(TypeError, match="does not support reduction"):
+            getattr(ser, method)()
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            getattr(np, method)(ser)
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            getattr(df, method)(bool_only=False)
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            getattr(df, method)(bool_only=None)
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            getattr(np, method)(df, axis=0)
+
+    def test_median_categorical_dtype_nuisance_column(self):
+        # GH#21020 DataFrame.median should match Series.median
+        df = DataFrame({"A": Categorical([1, 2, 2, 2, 3])})
+        ser = df["A"]
+
+        # Double-check the Series behavior is to raise
+        with pytest.raises(TypeError, match="does not support reduction"):
+            ser.median()
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            df.median(numeric_only=False)
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            df.median()
+
+        # same thing, but with an additional non-categorical column
+        df["B"] = df["A"].astype(int)
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            df.median(numeric_only=False)
+
+        with pytest.raises(TypeError, match="does not support reduction"):
+            df.median()
+
+        # TODO: np.median(df, axis=0) gives np.array([2.0, 2.0]) instead
+        #  of expected.values
+
+    @pytest.mark.parametrize("method", ["min", "max"])
+    def test_min_max_categorical_dtype_non_ordered_nuisance_column(self, method):
+        # GH#28949 DataFrame.min should behave like Series.min
+        cat = Categorical(["a", "b", "c", "b"], ordered=False)
+        ser = Series(cat)
+        df = ser.to_frame("A")
+
+        # Double-check the Series behavior
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(ser, method)()
+
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(np, method)(ser)
+
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(df, method)(numeric_only=False)
+
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(df, method)()
+
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(np, method)(df, axis=0)
+
+        # same thing, but with an additional non-categorical column
+        df["B"] = df["A"].astype(object)
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(df, method)()
+
+        with pytest.raises(TypeError, match="is not ordered for operation"):
+            getattr(np, method)(df, axis=0)
+
+
+class TestEmptyDataFrameReductions:
+    @pytest.mark.parametrize(
+        "opname, dtype, exp_value, exp_dtype",
+        [
+            ("sum", np.int8, 0, np.int64),
+            ("prod", np.int8, 1, np.int_),
+            ("sum", np.int64, 0, np.int64),
+            ("prod", np.int64, 1, np.int64),
+            ("sum", np.uint8, 0, np.uint64),
+            ("prod", np.uint8, 1, np.uint),
+            ("sum", np.uint64, 0, np.uint64),
+            ("prod", np.uint64, 1, np.uint64),
+            ("sum", np.float32, 0, np.float32),
+            ("prod", np.float32, 1, np.float32),
+            ("sum", np.float64, 0, np.float64),
+        ],
+    )
+    def test_df_empty_min_count_0(self, opname, dtype, exp_value, exp_dtype):
+        df = DataFrame({0: [], 1: []}, dtype=dtype)
+        result = getattr(df, opname)(min_count=0)
+
+        expected = Series([exp_value, exp_value], dtype=exp_dtype)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "opname, dtype, exp_dtype",
+        [
+            ("sum", np.int8, np.float64),
+            ("prod", np.int8, np.float64),
+            ("sum", np.int64, np.float64),
+            ("prod", np.int64, np.float64),
+            ("sum", np.uint8, np.float64),
+            ("prod", np.uint8, np.float64),
+            ("sum", np.uint64, np.float64),
+            ("prod", np.uint64, np.float64),
+            ("sum", np.float32, np.float32),
+            ("prod", np.float32, np.float32),
+            ("sum", np.float64, np.float64),
+        ],
+    )
+    def test_df_empty_min_count_1(self, opname, dtype, exp_dtype):
+        df = DataFrame({0: [], 1: []}, dtype=dtype)
+        result = getattr(df, opname)(min_count=1)
+
+        expected = Series([np.nan, np.nan], dtype=exp_dtype)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "opname, dtype, exp_value, exp_dtype",
+        [
+            ("sum", "Int8", 0, ("Int32" if is_windows_np2_or_is32 else "Int64")),
+            ("prod", "Int8", 1, ("Int32" if is_windows_np2_or_is32 else "Int64")),
+            ("prod", "Int8", 1, ("Int32" if is_windows_np2_or_is32 else "Int64")),
+            ("sum", "Int64", 0, "Int64"),
+            ("prod", "Int64", 1, "Int64"),
+            ("sum", "UInt8", 0, ("UInt32" if is_windows_np2_or_is32 else "UInt64")),
+            ("prod", "UInt8", 1, ("UInt32" if is_windows_np2_or_is32 else "UInt64")),
+            ("sum", "UInt64", 0, "UInt64"),
+            ("prod", "UInt64", 1, "UInt64"),
+            ("sum", "Float32", 0, "Float32"),
+            ("prod", "Float32", 1, "Float32"),
+            ("sum", "Float64", 0, "Float64"),
+        ],
+    )
+    def test_df_empty_nullable_min_count_0(self, opname, dtype, exp_value, exp_dtype):
+        df = DataFrame({0: [], 1: []}, dtype=dtype)
+        result = getattr(df, opname)(min_count=0)
+
+        expected = Series([exp_value, exp_value], dtype=exp_dtype)
+        tm.assert_series_equal(result, expected)
+
+    # TODO: why does min_count=1 impact the resulting Windows dtype
+    # differently than min_count=0?
+    @pytest.mark.parametrize(
+        "opname, dtype, exp_dtype",
+        [
+            ("sum", "Int8", ("Int32" if is_windows_or_is32 else "Int64")),
+            ("prod", "Int8", ("Int32" if is_windows_or_is32 else "Int64")),
+            ("sum", "Int64", "Int64"),
+            ("prod", "Int64", "Int64"),
+            ("sum", "UInt8", ("UInt32" if is_windows_or_is32 else "UInt64")),
+            ("prod", "UInt8", ("UInt32" if is_windows_or_is32 else "UInt64")),
+            ("sum", "UInt64", "UInt64"),
+            ("prod", "UInt64", "UInt64"),
+            ("sum", "Float32", "Float32"),
+            ("prod", "Float32", "Float32"),
+            ("sum", "Float64", "Float64"),
+        ],
+    )
+    def test_df_empty_nullable_min_count_1(self, opname, dtype, exp_dtype):
+        df = DataFrame({0: [], 1: []}, dtype=dtype)
+        result = getattr(df, opname)(min_count=1)
+
+        expected = Series([pd.NA, pd.NA], dtype=exp_dtype)
+        tm.assert_series_equal(result, expected)
+
+
+def test_sum_timedelta64_skipna_false(using_array_manager, request):
+    # GH#17235
+    if using_array_manager:
+        mark = pytest.mark.xfail(
+            reason="Incorrect type inference on NaT in reduction result"
+        )
+        request.applymarker(mark)
+
+    arr = np.arange(8).astype(np.int64).view("m8[s]").reshape(4, 2)
+    arr[-1, -1] = "Nat"
+
+    df = DataFrame(arr)
+    assert (df.dtypes == arr.dtype).all()
+
+    result = df.sum(skipna=False)
+    expected = Series([pd.Timedelta(seconds=12), pd.NaT], dtype="m8[s]")
+    tm.assert_series_equal(result, expected)
+
+    result = df.sum(axis=0, skipna=False)
+    tm.assert_series_equal(result, expected)
+
+    result = df.sum(axis=1, skipna=False)
+    expected = Series(
+        [
+            pd.Timedelta(seconds=1),
+            pd.Timedelta(seconds=5),
+            pd.Timedelta(seconds=9),
+            pd.NaT,
+        ],
+        dtype="m8[s]",
+    )
+    tm.assert_series_equal(result, expected)
+
+
+@pytest.mark.xfail(
+    using_pyarrow_string_dtype(), reason="sum doesn't work with arrow strings"
+)
+def test_mixed_frame_with_integer_sum():
+    # https://github.com/pandas-dev/pandas/issues/34520
+    df = DataFrame([["a", 1]], columns=list("ab"))
+    df = df.astype({"b": "Int64"})
+    result = df.sum()
+    expected = Series(["a", 1], index=["a", "b"])
+    tm.assert_series_equal(result, expected)
+
+
+@pytest.mark.parametrize("numeric_only", [True, False, None])
+@pytest.mark.parametrize("method", ["min", "max"])
+def test_minmax_extensionarray(method, numeric_only):
+    # https://github.com/pandas-dev/pandas/issues/32651
+    int64_info = np.iinfo("int64")
+    ser = Series([int64_info.max, None, int64_info.min], dtype=pd.Int64Dtype())
+    df = DataFrame({"Int64": ser})
+    result = getattr(df, method)(numeric_only=numeric_only)
+    expected = Series(
+        [getattr(int64_info, method)],
+        dtype="Int64",
+        index=Index(["Int64"]),
+    )
+    tm.assert_series_equal(result, expected)
+
+
+@pytest.mark.parametrize("ts_value", [Timestamp("2000-01-01"), pd.NaT])
+def test_frame_mixed_numeric_object_with_timestamp(ts_value):
+    # GH 13912
+    df = DataFrame({"a": [1], "b": [1.1], "c": ["foo"], "d": [ts_value]})
+    with pytest.raises(TypeError, match="does not support reduction"):
+        df.sum()
+
+
+def test_prod_sum_min_count_mixed_object():
+    # https://github.com/pandas-dev/pandas/issues/41074
+    df = DataFrame([1, "a", True])
+
+    result = df.prod(axis=0, min_count=1, numeric_only=False)
+    expected = Series(["a"], dtype=object)
+    tm.assert_series_equal(result, expected)
+
+    msg = re.escape("unsupported operand type(s) for +: 'int' and 'str'")
+    with pytest.raises(TypeError, match=msg):
+        df.sum(axis=0, min_count=1, numeric_only=False)
+
+
+@pytest.mark.parametrize("method", ["min", "max", "mean", "median", "skew", "kurt"])
+@pytest.mark.parametrize("numeric_only", [True, False])
+@pytest.mark.parametrize("dtype", ["float64", "Float64"])
+def test_reduction_axis_none_returns_scalar(method, numeric_only, dtype):
+    # GH#21597 As of 2.0, axis=None reduces over all axes.
+
+    df = DataFrame(np.random.default_rng(2).standard_normal((4, 4)), dtype=dtype)
+
+    result = getattr(df, method)(axis=None, numeric_only=numeric_only)
+    np_arr = df.to_numpy(dtype=np.float64)
+    if method in {"skew", "kurt"}:
+        comp_mod = pytest.importorskip("scipy.stats")
+        if method == "kurt":
+            method = "kurtosis"
+        expected = getattr(comp_mod, method)(np_arr, bias=False, axis=None)
+        tm.assert_almost_equal(result, expected)
+    else:
+        expected = getattr(np, method)(np_arr, axis=None)
+        assert result == expected
+
+
+@pytest.mark.parametrize(
+    "kernel",
+    [
+        "corr",
+        "corrwith",
+        "cov",
+        "idxmax",
+        "idxmin",
+        "kurt",
+        "max",
+        "mean",
+        "median",
+        "min",
+        "prod",
+        "quantile",
+        "sem",
+        "skew",
+        "std",
+        "sum",
+        "var",
+    ],
+)
+def test_fails_on_non_numeric(kernel):
+    # GH#46852
+    df = DataFrame({"a": [1, 2, 3], "b": object})
+    args = (df,) if kernel == "corrwith" else ()
+    msg = "|".join(
+        [
+            "not allowed for this dtype",
+            "argument must be a string or a number",
+            "not supported between instances of",
+            "unsupported operand type",
+            "argument must be a string or a real number",
+        ]
+    )
+    if kernel == "median":
+        # slightly different message on different builds
+        msg1 = (
+            r"Cannot convert \[\[<class 'object'> <class 'object'> "
+            r"<class 'object'>\]\] to numeric"
+        )
+        msg2 = (
+            r"Cannot convert \[<class 'object'> <class 'object'> "
+            r"<class 'object'>\] to numeric"
+        )
+        msg = "|".join([msg1, msg2])
+    with pytest.raises(TypeError, match=msg):
+        getattr(df, kernel)(*args)
+
+
+@pytest.mark.parametrize(
+    "method",
+    [
+        "all",
+        "any",
+        "count",
+        "idxmax",
+        "idxmin",
+        "kurt",
+        "kurtosis",
+        "max",
+        "mean",
+        "median",
+        "min",
+        "nunique",
+        "prod",
+        "product",
+        "sem",
+        "skew",
+        "std",
+        "sum",
+        "var",
+    ],
+)
+@pytest.mark.parametrize("min_count", [0, 2])
+def test_numeric_ea_axis_1(method, skipna, min_count, any_numeric_ea_dtype):
+    # GH 54341
+    df = DataFrame(
+        {
+            "a": Series([0, 1, 2, 3], dtype=any_numeric_ea_dtype),
+            "b": Series([0, 1, pd.NA, 3], dtype=any_numeric_ea_dtype),
+        },
+    )
+    expected_df = DataFrame(
+        {
+            "a": [0.0, 1.0, 2.0, 3.0],
+            "b": [0.0, 1.0, np.nan, 3.0],
+        },
+    )
+    if method in ("count", "nunique"):
+        expected_dtype = "int64"
+    elif method in ("all", "any"):
+        expected_dtype = "boolean"
+    elif method in (
+        "kurt",
+        "kurtosis",
+        "mean",
+        "median",
+        "sem",
+        "skew",
+        "std",
+        "var",
+    ) and not any_numeric_ea_dtype.startswith("Float"):
+        expected_dtype = "Float64"
+    else:
+        expected_dtype = any_numeric_ea_dtype
+
+    kwargs = {}
+    if method not in ("count", "nunique", "quantile"):
+        kwargs["skipna"] = skipna
+    if method in ("prod", "product", "sum"):
+        kwargs["min_count"] = min_count
+
+    warn = None
+    msg = None
+    if not skipna and method in ("idxmax", "idxmin"):
+        warn = FutureWarning
+        msg = f"The behavior of DataFrame.{method} with all-NA values"
+    with tm.assert_produces_warning(warn, match=msg):
+        result = getattr(df, method)(axis=1, **kwargs)
+    with tm.assert_produces_warning(warn, match=msg):
+        expected = getattr(expected_df, method)(axis=1, **kwargs)
+    if method not in ("idxmax", "idxmin"):
+        expected = expected.astype(expected_dtype)
+    tm.assert_series_equal(result, expected)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_ufunc.py

@@ -0,0 +1,311 @@
+from functools import partial
+import re
+
+import numpy as np
+import pytest
+
+import pandas as pd
+import pandas._testing as tm
+from pandas.api.types import is_extension_array_dtype
+
+dtypes = [
+    "int64",
+    "Int64",
+    {"A": "int64", "B": "Int64"},
+]
+
+
+@pytest.mark.parametrize("dtype", dtypes)
+def test_unary_unary(dtype):
+    # unary input, unary output
+    values = np.array([[-1, -1], [1, 1]], dtype="int64")
+    df = pd.DataFrame(values, columns=["A", "B"], index=["a", "b"]).astype(dtype=dtype)
+    result = np.positive(df)
+    expected = pd.DataFrame(
+        np.positive(values), index=df.index, columns=df.columns
+    ).astype(dtype)
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize("dtype", dtypes)
+def test_unary_binary(request, dtype):
+    # unary input, binary output
+    if is_extension_array_dtype(dtype) or isinstance(dtype, dict):
+        request.applymarker(
+            pytest.mark.xfail(
+                reason="Extension / mixed with multiple outputs not implemented."
+            )
+        )
+
+    values = np.array([[-1, -1], [1, 1]], dtype="int64")
+    df = pd.DataFrame(values, columns=["A", "B"], index=["a", "b"]).astype(dtype=dtype)
+    result_pandas = np.modf(df)
+    assert isinstance(result_pandas, tuple)
+    assert len(result_pandas) == 2
+    expected_numpy = np.modf(values)
+
+    for result, b in zip(result_pandas, expected_numpy):
+        expected = pd.DataFrame(b, index=df.index, columns=df.columns)
+        tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize("dtype", dtypes)
+def test_binary_input_dispatch_binop(dtype):
+    # binop ufuncs are dispatched to our dunder methods.
+    values = np.array([[-1, -1], [1, 1]], dtype="int64")
+    df = pd.DataFrame(values, columns=["A", "B"], index=["a", "b"]).astype(dtype=dtype)
+    result = np.add(df, df)
+    expected = pd.DataFrame(
+        np.add(values, values), index=df.index, columns=df.columns
+    ).astype(dtype)
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize(
+    "func,arg,expected",
+    [
+        (np.add, 1, [2, 3, 4, 5]),
+        (
+            partial(np.add, where=[[False, True], [True, False]]),
+            np.array([[1, 1], [1, 1]]),
+            [0, 3, 4, 0],
+        ),
+        (np.power, np.array([[1, 1], [2, 2]]), [1, 2, 9, 16]),
+        (np.subtract, 2, [-1, 0, 1, 2]),
+        (
+            partial(np.negative, where=np.array([[False, True], [True, False]])),
+            None,
+            [0, -2, -3, 0],
+        ),
+    ],
+)
+def test_ufunc_passes_args(func, arg, expected):
+    # GH#40662
+    arr = np.array([[1, 2], [3, 4]])
+    df = pd.DataFrame(arr)
+    result_inplace = np.zeros_like(arr)
+    # 1-argument ufunc
+    if arg is None:
+        result = func(df, out=result_inplace)
+    else:
+        result = func(df, arg, out=result_inplace)
+
+    expected = np.array(expected).reshape(2, 2)
+    tm.assert_numpy_array_equal(result_inplace, expected)
+
+    expected = pd.DataFrame(expected)
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize("dtype_a", dtypes)
+@pytest.mark.parametrize("dtype_b", dtypes)
+def test_binary_input_aligns_columns(request, dtype_a, dtype_b):
+    if (
+        is_extension_array_dtype(dtype_a)
+        or isinstance(dtype_a, dict)
+        or is_extension_array_dtype(dtype_b)
+        or isinstance(dtype_b, dict)
+    ):
+        request.applymarker(
+            pytest.mark.xfail(
+                reason="Extension / mixed with multiple inputs not implemented."
+            )
+        )
+
+    df1 = pd.DataFrame({"A": [1, 2], "B": [3, 4]}).astype(dtype_a)
+
+    if isinstance(dtype_a, dict) and isinstance(dtype_b, dict):
+        dtype_b = dtype_b.copy()
+        dtype_b["C"] = dtype_b.pop("B")
+    df2 = pd.DataFrame({"A": [1, 2], "C": [3, 4]}).astype(dtype_b)
+    # As of 2.0, align first before applying the ufunc
+    result = np.heaviside(df1, df2)
+    expected = np.heaviside(
+        np.array([[1, 3, np.nan], [2, 4, np.nan]]),
+        np.array([[1, np.nan, 3], [2, np.nan, 4]]),
+    )
+    expected = pd.DataFrame(expected, index=[0, 1], columns=["A", "B", "C"])
+    tm.assert_frame_equal(result, expected)
+
+    result = np.heaviside(df1, df2.values)
+    expected = pd.DataFrame([[1.0, 1.0], [1.0, 1.0]], columns=["A", "B"])
+    tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize("dtype", dtypes)
+def test_binary_input_aligns_index(request, dtype):
+    if is_extension_array_dtype(dtype) or isinstance(dtype, dict):
+        request.applymarker(
+            pytest.mark.xfail(
+                reason="Extension / mixed with multiple inputs not implemented."
+            )
+        )
+    df1 = pd.DataFrame({"A": [1, 2], "B": [3, 4]}, index=["a", "b"]).astype(dtype)
+    df2 = pd.DataFrame({"A": [1, 2], "B": [3, 4]}, index=["a", "c"]).astype(dtype)
+    result = np.heaviside(df1, df2)
+    expected = np.heaviside(
+        np.array([[1, 3], [3, 4], [np.nan, np.nan]]),
+        np.array([[1, 3], [np.nan, np.nan], [3, 4]]),
+    )
+    # TODO(FloatArray): this will be Float64Dtype.
+    expected = pd.DataFrame(expected, index=["a", "b", "c"], columns=["A", "B"])
+    tm.assert_frame_equal(result, expected)
+
+    result = np.heaviside(df1, df2.values)
+    expected = pd.DataFrame(
+        [[1.0, 1.0], [1.0, 1.0]], columns=["A", "B"], index=["a", "b"]
+    )
+    tm.assert_frame_equal(result, expected)
+
+
+def test_binary_frame_series_raises():
+    # We don't currently implement
+    df = pd.DataFrame({"A": [1, 2]})
+    with pytest.raises(NotImplementedError, match="logaddexp"):
+        np.logaddexp(df, df["A"])
+
+    with pytest.raises(NotImplementedError, match="logaddexp"):
+        np.logaddexp(df["A"], df)
+
+
+def test_unary_accumulate_axis():
+    # https://github.com/pandas-dev/pandas/issues/39259
+    df = pd.DataFrame({"a": [1, 3, 2, 4]})
+    result = np.maximum.accumulate(df)
+    expected = pd.DataFrame({"a": [1, 3, 3, 4]})
+    tm.assert_frame_equal(result, expected)
+
+    df = pd.DataFrame({"a": [1, 3, 2, 4], "b": [0.1, 4.0, 3.0, 2.0]})
+    result = np.maximum.accumulate(df)
+    # in theory could preserve int dtype for default axis=0
+    expected = pd.DataFrame({"a": [1.0, 3.0, 3.0, 4.0], "b": [0.1, 4.0, 4.0, 4.0]})
+    tm.assert_frame_equal(result, expected)
+
+    result = np.maximum.accumulate(df, axis=0)
+    tm.assert_frame_equal(result, expected)
+
+    result = np.maximum.accumulate(df, axis=1)
+    expected = pd.DataFrame({"a": [1.0, 3.0, 2.0, 4.0], "b": [1.0, 4.0, 3.0, 4.0]})
+    tm.assert_frame_equal(result, expected)
+
+
+def test_frame_outer_disallowed():
+    df = pd.DataFrame({"A": [1, 2]})
+    with pytest.raises(NotImplementedError, match=""):
+        # deprecation enforced in 2.0
+        np.subtract.outer(df, df)
+
+
+def test_alignment_deprecation_enforced():
+    # Enforced in 2.0
+    # https://github.com/pandas-dev/pandas/issues/39184
+    df1 = pd.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
+    df2 = pd.DataFrame({"b": [1, 2, 3], "c": [4, 5, 6]})
+    s1 = pd.Series([1, 2], index=["a", "b"])
+    s2 = pd.Series([1, 2], index=["b", "c"])
+
+    # binary dataframe / dataframe
+    expected = pd.DataFrame({"a": [2, 4, 6], "b": [8, 10, 12]})
+
+    with tm.assert_produces_warning(None):
+        # aligned -> no warning!
+        result = np.add(df1, df1)
+    tm.assert_frame_equal(result, expected)
+
+    result = np.add(df1, df2.values)
+    tm.assert_frame_equal(result, expected)
+
+    result = np.add(df1, df2)
+    expected = pd.DataFrame({"a": [np.nan] * 3, "b": [5, 7, 9], "c": [np.nan] * 3})
+    tm.assert_frame_equal(result, expected)
+
+    result = np.add(df1.values, df2)
+    expected = pd.DataFrame({"b": [2, 4, 6], "c": [8, 10, 12]})
+    tm.assert_frame_equal(result, expected)
+
+    # binary dataframe / series
+    expected = pd.DataFrame({"a": [2, 3, 4], "b": [6, 7, 8]})
+
+    with tm.assert_produces_warning(None):
+        # aligned -> no warning!
+        result = np.add(df1, s1)
+    tm.assert_frame_equal(result, expected)
+
+    result = np.add(df1, s2.values)
+    tm.assert_frame_equal(result, expected)
+
+    expected = pd.DataFrame(
+        {"a": [np.nan] * 3, "b": [5.0, 6.0, 7.0], "c": [np.nan] * 3}
+    )
+    result = np.add(df1, s2)
+    tm.assert_frame_equal(result, expected)
+
+    msg = "Cannot apply ufunc <ufunc 'add'> to mixed DataFrame and Series inputs."
+    with pytest.raises(NotImplementedError, match=msg):
+        np.add(s2, df1)
+
+
+def test_alignment_deprecation_many_inputs_enforced():
+    # Enforced in 2.0
+    # https://github.com/pandas-dev/pandas/issues/39184
+    # test that the deprecation also works with > 2 inputs -> using a numba
+    # written ufunc for this because numpy itself doesn't have such ufuncs
+    numba = pytest.importorskip("numba")
+
+    @numba.vectorize([numba.float64(numba.float64, numba.float64, numba.float64)])
+    def my_ufunc(x, y, z):
+        return x + y + z
+
+    df1 = pd.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
+    df2 = pd.DataFrame({"b": [1, 2, 3], "c": [4, 5, 6]})
+    df3 = pd.DataFrame({"a": [1, 2, 3], "c": [4, 5, 6]})
+
+    result = my_ufunc(df1, df2, df3)
+    expected = pd.DataFrame(np.full((3, 3), np.nan), columns=["a", "b", "c"])
+    tm.assert_frame_equal(result, expected)
+
+    # all aligned -> no warning
+    with tm.assert_produces_warning(None):
+        result = my_ufunc(df1, df1, df1)
+    expected = pd.DataFrame([[3.0, 12.0], [6.0, 15.0], [9.0, 18.0]], columns=["a", "b"])
+    tm.assert_frame_equal(result, expected)
+
+    # mixed frame / arrays
+    msg = (
+        r"operands could not be broadcast together with shapes \(3,3\) \(3,3\) \(3,2\)"
+    )
+    with pytest.raises(ValueError, match=msg):
+        my_ufunc(df1, df2, df3.values)
+
+    # single frame -> no warning
+    with tm.assert_produces_warning(None):
+        result = my_ufunc(df1, df2.values, df3.values)
+    tm.assert_frame_equal(result, expected)
+
+    # takes indices of first frame
+    msg = (
+        r"operands could not be broadcast together with shapes \(3,2\) \(3,3\) \(3,3\)"
+    )
+    with pytest.raises(ValueError, match=msg):
+        my_ufunc(df1.values, df2, df3)
+
+
+def test_array_ufuncs_for_many_arguments():
+    # GH39853
+    def add3(x, y, z):
+        return x + y + z
+
+    ufunc = np.frompyfunc(add3, 3, 1)
+    df = pd.DataFrame([[1, 2], [3, 4]])
+
+    result = ufunc(df, df, 1)
+    expected = pd.DataFrame([[3, 5], [7, 9]], dtype=object)
+    tm.assert_frame_equal(result, expected)
+
+    ser = pd.Series([1, 2])
+    msg = (
+        "Cannot apply ufunc <ufunc 'add3 (vectorized)'> "
+        "to mixed DataFrame and Series inputs."
+    )
+    with pytest.raises(NotImplementedError, match=re.escape(msg)):
+        ufunc(df, df, ser)

env-llmeval/lib/python3.10/site-packages/pandas/tests/frame/test_unary.py

@@ -0,0 +1,204 @@
+from decimal import Decimal
+
+import numpy as np
+import pytest
+
+from pandas.compat.numpy import np_version_gte1p25
+
+import pandas as pd
+import pandas._testing as tm
+
+
+class TestDataFrameUnaryOperators:
+    # __pos__, __neg__, __invert__
+
+    @pytest.mark.parametrize(
+        "df,expected",
+        [
+            (pd.DataFrame({"a": [-1, 1]}), pd.DataFrame({"a": [1, -1]})),
+            (pd.DataFrame({"a": [False, True]}), pd.DataFrame({"a": [True, False]})),
+            (
+                pd.DataFrame({"a": pd.Series(pd.to_timedelta([-1, 1]))}),
+                pd.DataFrame({"a": pd.Series(pd.to_timedelta([1, -1]))}),
+            ),
+        ],
+    )
+    def test_neg_numeric(self, df, expected):
+        tm.assert_frame_equal(-df, expected)
+        tm.assert_series_equal(-df["a"], expected["a"])
+
+    @pytest.mark.parametrize(
+        "df, expected",
+        [
+            (np.array([1, 2], dtype=object), np.array([-1, -2], dtype=object)),
+            ([Decimal("1.0"), Decimal("2.0")], [Decimal("-1.0"), Decimal("-2.0")]),
+        ],
+    )
+    def test_neg_object(self, df, expected):
+        # GH#21380
+        df = pd.DataFrame({"a": df})
+        expected = pd.DataFrame({"a": expected})
+        tm.assert_frame_equal(-df, expected)
+        tm.assert_series_equal(-df["a"], expected["a"])
+
+    @pytest.mark.parametrize(
+        "df",
+        [
+            pd.DataFrame({"a": ["a", "b"]}),
+            pd.DataFrame({"a": pd.to_datetime(["2017-01-22", "1970-01-01"])}),
+        ],
+    )
+    def test_neg_raises(self, df, using_infer_string):
+        msg = (
+            "bad operand type for unary -: 'str'|"
+            r"bad operand type for unary -: 'DatetimeArray'"
+        )
+        if using_infer_string and df.dtypes.iloc[0] == "string":
+            import pyarrow as pa
+
+            msg = "has no kernel"
+            with pytest.raises(pa.lib.ArrowNotImplementedError, match=msg):
+                (-df)
+            with pytest.raises(pa.lib.ArrowNotImplementedError, match=msg):
+                (-df["a"])
+
+        else:
+            with pytest.raises(TypeError, match=msg):
+                (-df)
+            with pytest.raises(TypeError, match=msg):
+                (-df["a"])
+
+    def test_invert(self, float_frame):
+        df = float_frame
+
+        tm.assert_frame_equal(-(df < 0), ~(df < 0))
+
+    def test_invert_mixed(self):
+        shape = (10, 5)
+        df = pd.concat(
+            [
+                pd.DataFrame(np.zeros(shape, dtype="bool")),
+                pd.DataFrame(np.zeros(shape, dtype=int)),
+            ],
+            axis=1,
+            ignore_index=True,
+        )
+        result = ~df
+        expected = pd.concat(
+            [
+                pd.DataFrame(np.ones(shape, dtype="bool")),
+                pd.DataFrame(-np.ones(shape, dtype=int)),
+            ],
+            axis=1,
+            ignore_index=True,
+        )
+        tm.assert_frame_equal(result, expected)
+
+    def test_invert_empty_not_input(self):
+        # GH#51032
+        df = pd.DataFrame()
+        result = ~df
+        tm.assert_frame_equal(df, result)
+        assert df is not result
+
+    @pytest.mark.parametrize(
+        "df",
+        [
+            pd.DataFrame({"a": [-1, 1]}),
+            pd.DataFrame({"a": [False, True]}),
+            pd.DataFrame({"a": pd.Series(pd.to_timedelta([-1, 1]))}),
+        ],
+    )
+    def test_pos_numeric(self, df):
+        # GH#16073
+        tm.assert_frame_equal(+df, df)
+        tm.assert_series_equal(+df["a"], df["a"])
+
+    @pytest.mark.parametrize(
+        "df",
+        [
+            pd.DataFrame({"a": np.array([-1, 2], dtype=object)}),
+            pd.DataFrame({"a": [Decimal("-1.0"), Decimal("2.0")]}),
+        ],
+    )
+    def test_pos_object(self, df):
+        # GH#21380
+        tm.assert_frame_equal(+df, df)
+        tm.assert_series_equal(+df["a"], df["a"])
+
+    @pytest.mark.parametrize(
+        "df",
+        [
+            pytest.param(
+                pd.DataFrame({"a": ["a", "b"]}),
+                # filterwarnings removable once min numpy version is 1.25
+                marks=[
+                    pytest.mark.filterwarnings("ignore:Applying:DeprecationWarning")
+                ],
+            ),
+        ],
+    )
+    def test_pos_object_raises(self, df):
+        # GH#21380
+        if np_version_gte1p25:
+            with pytest.raises(
+                TypeError, match=r"^bad operand type for unary \+: \'str\'$"
+            ):
+                tm.assert_frame_equal(+df, df)
+        else:
+            tm.assert_series_equal(+df["a"], df["a"])
+
+    @pytest.mark.parametrize(
+        "df", [pd.DataFrame({"a": pd.to_datetime(["2017-01-22", "1970-01-01"])})]
+    )
+    def test_pos_raises(self, df):
+        msg = r"bad operand type for unary \+: 'DatetimeArray'"
+        with pytest.raises(TypeError, match=msg):
+            (+df)
+        with pytest.raises(TypeError, match=msg):
+            (+df["a"])
+
+    def test_unary_nullable(self):
+        df = pd.DataFrame(
+            {
+                "a": pd.array([1, -2, 3, pd.NA], dtype="Int64"),
+                "b": pd.array([4.0, -5.0, 6.0, pd.NA], dtype="Float32"),
+                "c": pd.array([True, False, False, pd.NA], dtype="boolean"),
+                # include numpy bool to make sure bool-vs-boolean behavior
+                #  is consistent in non-NA locations
+                "d": np.array([True, False, False, True]),
+            }
+        )
+
+        result = +df
+        res_ufunc = np.positive(df)
+        expected = df
+        # TODO: assert that we have copies?
+        tm.assert_frame_equal(result, expected)
+        tm.assert_frame_equal(res_ufunc, expected)
+
+        result = -df
+        res_ufunc = np.negative(df)
+        expected = pd.DataFrame(
+            {
+                "a": pd.array([-1, 2, -3, pd.NA], dtype="Int64"),
+                "b": pd.array([-4.0, 5.0, -6.0, pd.NA], dtype="Float32"),
+                "c": pd.array([False, True, True, pd.NA], dtype="boolean"),
+                "d": np.array([False, True, True, False]),
+            }
+        )
+        tm.assert_frame_equal(result, expected)
+        tm.assert_frame_equal(res_ufunc, expected)
+
+        result = abs(df)
+        res_ufunc = np.abs(df)
+        expected = pd.DataFrame(
+            {
+                "a": pd.array([1, 2, 3, pd.NA], dtype="Int64"),
+                "b": pd.array([4.0, 5.0, 6.0, pd.NA], dtype="Float32"),
+                "c": pd.array([True, False, False, pd.NA], dtype="boolean"),
+                "d": np.array([True, False, False, True]),
+            }
+        )
+        tm.assert_frame_equal(result, expected)
+        tm.assert_frame_equal(res_ufunc, expected)