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#9236: test for the DataFrame.groupby with MultiIndex having pd.NaT #25310

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Merged
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Feb 19, 2019
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#9236: test for the DataFrame.groupby with MultiIndex having pd.NaT #25310

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16 changes: 16 additions & 0 deletions pandas/tests/groupby/test_groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1698,3 +1698,19 @@ def test_groupby_agg_ohlc_non_first():
result = df.groupby(pd.Grouper(freq='D')).agg(['sum', 'ohlc'])

tm.assert_frame_equal(result, expected)


def test_groupby_multiindex_nat():
# GH 9236
values = [
(pd.NaT, 'a'),
(datetime(2012, 1, 2), 'a'),
(datetime(2012, 1, 2), 'b'),
(datetime(2012, 1, 3), 'a')
]
mi = pd.MultiIndex.from_tuples(values, names=['date', None])
ser = pd.Series([3, 2, 2.5, 4], index=mi)

result = ser.groupby(level=1).mean()
expected = pd.Series([3., 2.5], index=["a", "b"])
assert_series_equal(result, expected)