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TST: Group by callable test #55926

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Merged
merged 2 commits into from
Nov 13, 2023
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TST: Group by callable test #55926

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8c89d60
add test
quangngd Nov 12, 2023
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lint
quangngd Nov 12, 2023
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17 changes: 17 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 @@ -297,6 +297,23 @@ def test_grouper_creation_bug3(self):
expected = ser.groupby(level="one").sum()
tm.assert_series_equal(result, expected)

@pytest.mark.parametrize("func", [False, True])
def test_grouper_returning_tuples(self, func):
# GH 22257 , both with dict and with callable
df = DataFrame({"X": ["A", "B", "A", "B"], "Y": [1, 4, 3, 2]})
mapping = dict(zip(range(4), [("C", 5), ("D", 6)] * 2))

if func:
gb = df.groupby(by=lambda idx: mapping[idx], sort=False)
else:
gb = df.groupby(by=mapping, sort=False)

name, expected = next(iter(gb))
assert name == ("C", 5)
result = gb.get_group(name)

tm.assert_frame_equal(result, expected)

def test_grouper_column_and_index(self):
# GH 14327

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