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TST: Add test groupby transform no column #56935

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TST: Add test groupby transform no column #56935

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3d016ab
Update .gitpod.yml
DevpriyaDave Dec 6, 2023
dcb2ab4
Add test groupby transform with no column
Jan 17, 2024
39b1929
undo gitpod changes
Jan 17, 2024
01dbc0e
Merge branch 'main' into add_test_groupby_transform_no_column
DevpriyaDave Jan 17, 2024
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10 changes: 10 additions & 0 deletions pandas/tests/groupby/transform/test_transform.py
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Original file line number Diff line number Diff line change
Expand Up @@ -650,6 +650,16 @@ def test_groupby_transform_with_nan_group():
expected = Series([1.0, 1.0, 2.0, 3.0, np.nan, 6.0, 6.0, 9.0, 9.0, 9.0], name="a")
tm.assert_series_equal(result, expected)

def test_groupby_transform_with_no_column():
# GH 49864
df = pd.DataFrame({0: [1.0]})
gb = df.groupby(pd.Series(["a"]), as_index=False)
msg = "A grouping was used that is not in the columns of the DataFrame"
with tm.assert_produces_warning(FutureWarning, match=msg):
result = gb.sum()
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For the linked issue, you want to be using .transform("sum") here.

tm.assert_frame_equal(result, df)



def test_transform_mixed_type():
index = MultiIndex.from_arrays([[0, 0, 0, 1, 1, 1], [1, 2, 3, 1, 2, 3]])
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