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TST: test that re-using a list of groupers will not throw ValueError #62374

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Merged
merged 2 commits into from
Sep 19, 2025
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TST: test that re-using a list of groupers will not throw ValueError #62374

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155ffc0
TST: test that re-using a list of groupers will not throw ValueError
jarent-nvidia Sep 18, 2025
f7cc2f1
TST: Fix style check errors
jarent-nvidia Sep 19, 2025
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16 changes: 16 additions & 0 deletions pandas/tests/groupby/test_grouping.py
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Original file line number Diff line number Diff line change
Expand Up @@ -875,6 +875,22 @@ def test_groupby_tuple_keys_handle_multiindex(self):
expected = expected[result.columns]
tm.assert_frame_equal(result.reset_index(drop=True), expected)

def test_groupby_grouper_immutable_list_item(self):
# GH 26564 - prevent 'ValueError: all keys need to be the same shape'
# when reusing a list of groupers
df1 = DataFrame([["05/29/2019"], ["05/28/2019"]], columns=["date"]).assign(
date=lambda df: pd.to_datetime(df["date"])
)
df2 = DataFrame(columns=["date"]).assign(
date=lambda df: pd.to_datetime(df["date"])
)

groupers = [Grouper(key="date", freq="1D")]

df1.groupby(groupers).head()
# no error
df2.groupby(groupers).head()


# get_group
# --------------------------------
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