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import functools
import warnings
__all__ = ["deprecated"]
class deprecated:
"""Decorator to mark a function or class as deprecated.
Issue a warning when the function is called/the class is instantiated and
adds a warning to the docstring.
The optional extra argument will be appended to the deprecation message
and the docstring. Note: to use this with the default value for extra, put
in an empty of parentheses:
Examples
--------
>>> from sklearn.utils import deprecated
>>> deprecated()
<sklearn.utils.deprecation.deprecated object at ...>
>>> @deprecated()
... def some_function(): pass
Parameters
----------
extra : str, default=''
To be added to the deprecation messages.
"""
# Adapted from https://wiki.python.org/moin/PythonDecoratorLibrary,
# but with many changes.
def __init__(self, extra=""):
self.extra = extra
def __call__(self, obj):
"""Call method
Parameters
----------
obj : object
"""
if isinstance(obj, type):
return self._decorate_class(obj)
elif isinstance(obj, property):
# Note that this is only triggered properly if the `property`
# decorator comes before the `deprecated` decorator, like so:
#
# @deprecated(msg)
# @property
# def deprecated_attribute_(self):
# ...
return self._decorate_property(obj)
else:
return self._decorate_fun(obj)
def _decorate_class(self, cls):
msg = "Class %s is deprecated" % cls.__name__
if self.extra:
msg += "; %s" % self.extra
new = cls.__new__
def wrapped(cls, *args, **kwargs):
warnings.warn(msg, category=FutureWarning)
if new is object.__new__:
return object.__new__(cls)
return new(cls, *args, **kwargs)
cls.__new__ = wrapped
wrapped.__name__ = "__new__"
wrapped.deprecated_original = new
return cls
def _decorate_fun(self, fun):
"""Decorate function fun"""
msg = "Function %s is deprecated" % fun.__name__
if self.extra:
msg += "; %s" % self.extra
@functools.wraps(fun)
def wrapped(*args, **kwargs):
warnings.warn(msg, category=FutureWarning)
return fun(*args, **kwargs)
# Add a reference to the wrapped function so that we can introspect
# on function arguments in Python 2 (already works in Python 3)
wrapped.__wrapped__ = fun
return wrapped
def _decorate_property(self, prop):
msg = self.extra
@property
@functools.wraps(prop)
def wrapped(*args, **kwargs):
warnings.warn(msg, category=FutureWarning)
return prop.fget(*args, **kwargs)
return wrapped
def _is_deprecated(func):
"""Helper to check if func is wrapped by our deprecated decorator"""
closures = getattr(func, "__closure__", [])
if closures is None:
closures = []
is_deprecated = "deprecated" in "".join(
[c.cell_contents for c in closures if isinstance(c.cell_contents, str)]
)
return is_deprecated
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