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BUG: Add test to ensure, that bug will not occur again. #33058 #33072

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Merged
merged 4 commits into from
Apr 10, 2020
Merged

BUG: Add test to ensure, that bug will not occur again. #33058 #33072

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ca15eb6
BUG: Add test to ensure, that bug will not occur again. #33058
phofl Mar 27, 2020
1c86084
BUG: Change test name upon request
Mar 27, 2020
41e4374
Merge branch 'master' of https://github.com/pandas-dev/pandas into ad…
phofl Apr 2, 2020
46b5635
Add new line. Occurred during merge
phofl Apr 2, 2020
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21 changes: 21 additions & 0 deletions pandas/tests/groupby/test_apply.py
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Original file line number Diff line number Diff line change
Expand Up @@ -866,3 +866,24 @@ def fct(group):
[[1.0, 2.0], [3.0], [np.nan]], index=pd.Index(["a", "b", "none"], name="A")
)
tm.assert_series_equal(result, expected)


def test_apply_function_adds_a_row():
# GH: 33058
df = pd.DataFrame(
{"col1": ["A", "A", "A", "B", "B", "B"], "col2": [1, 2, 3, 4, 5, 6]}
)

def fn(x):
x.col2[x.index[-1]] = 0
return x.col2

result = df.groupby(["col1"], as_index=False).apply(fn)
expected = pd.Series(
[1, 2, 0, 4, 5, 0],
index=pd.MultiIndex.from_tuples(
[(0, 0), (0, 1), (0, 2), (1, 3), (1, 4), (1, 5)]
),
name="col2",
)
tm.assert_series_equal(result, expected)