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TST: Determine groupby-transform not convert back type #50754

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Merged
merged 5 commits into from
Jan 17, 2023
Merged

TST: Determine groupby-transform not convert back type #50754

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5a8d102
determine groupby-transform not convert back type
Jan 15, 2023
a31f40f
Replace format with f-string
Jan 15, 2023
a5734c9
assert whole DataFrame
Jan 15, 2023
6a28b44
add more cases
Jan 16, 2023
e484e76
instead format of f-string
Jan 16, 2023
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20 changes: 20 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 @@ -1046,6 +1046,26 @@ def test_groupby_transform_with_datetimes(func, values):
tm.assert_series_equal(result, expected)


def test_groupby_transform_dtype():
# GH 22243
df = DataFrame({"a": [1], "val": [1.35]})

result = df["val"].transform(lambda x: x.map(lambda y: f"+{y}"))
expected1 = Series(["+1.35"], name="val", dtype="object")
tm.assert_series_equal(result, expected1)

result = df.groupby("a")["val"].transform(lambda x: x.map(lambda y: f"+{y}"))
tm.assert_series_equal(result, expected1)

result = df.groupby("a")["val"].transform(lambda x: x.map(lambda y: f"+({y})"))
expected2 = Series(["+(1.35)"], name="val", dtype="object")
tm.assert_series_equal(result, expected2)

df["val"] = df["val"].astype(object)
result = df.groupby("a")["val"].transform(lambda x: x.map(lambda y: f"+{y}"))
tm.assert_series_equal(result, expected1)


@pytest.mark.parametrize("func", ["cumsum", "cumprod", "cummin", "cummax"])
def test_transform_absent_categories(func):
# GH 16771
Expand Down