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BUG - False drops groupings #58361

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BUG - False drops groupings #58361

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bbd9ec3
First commit
Apr 21, 2024
d1a68f6
commit for docstrings
Apr 22, 2024
addc1da
returning bug fix
Apr 22, 2024
6e37e52
reverting docstring fixes, making separate pull request
Apr 22, 2024
b612234
removed unnecessary library import
Apr 22, 2024
49850ea
finalization
Apr 22, 2024
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6 changes: 5 additions & 1 deletion pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2866,7 +2866,7 @@ def to_parquet(
Returns
-------
bytes if no path argument is provided else None

See Also
--------
read_parquet : Read a parquet file.
Expand Down Expand Up @@ -8984,6 +8984,10 @@ def groupby(

if level is None and by is None:
raise TypeError("You have to supply one of 'by' and 'level'")

if not as_index and isinstance(by, Series) and by.name in self.columns:
raise ValueError(f"cannot insert {by.name}, already exists")


return DataFrameGroupBy(
obj=self,
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