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TST: ensure groupby get by index value #33439 #33829

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May 1, 2020
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TST: ensure groupby get by index value #33439 #33829

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8 changes: 8 additions & 0 deletions pandas/tests/groupby/aggregate/test_aggregate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -940,3 +940,11 @@ def test_agg_multiple_lambda(self):
weight_min=pd.NamedAgg(column="weight", aggfunc=lambda x: np.min(x)),
)
tm.assert_frame_equal(result2, expected)


def test_groupby_get_by_index():
# GH 33439
df = pd.DataFrame({"A": ["S", "W", "W"], "B": [1.0, 1.0, 2.0]})
res = df.groupby("A").agg({"B": lambda x: x.get(x.index[-1])})
expected = pd.DataFrame(dict(A=["S", "W"], B=[1.0, 2.0])).set_index("A")
pd.testing.assert_frame_equal(res, expected)