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import pandas as pd
def process_data(transactions):
# Convert to DataFrame
df = pd.DataFrame(transactions)
if df.empty:
return df
# Ensure correct data types
df["date"] = pd.to_datetime(df["date"])
df["amount"] = df["amount"].astype(float)
# Add time-based columns
df["month"] = df["date"].dt.to_period("M")
df["week"] = df["date"].dt.isocalendar().week
return df |