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TST: DataFrameGroupBy.shift Loses TimeZone in datetime64 columns #30153

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Merged
merged 8 commits into from
Dec 11, 2019
Merged

TST: DataFrameGroupBy.shift Loses TimeZone in datetime64 columns #30153

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8e2feb3
TST: DataFrameGroupBy.shift Loses TimeZone in datetime64 columns
tranctan Dec 9, 2019
0c6351b
fix import format
tranctan Dec 9, 2019
f65e04c
Update code format
tranctan Dec 9, 2019
f2dc21f
Refactoring code
tranctan Dec 9, 2019
8197b8f
Eliminating self arg
tranctan Dec 10, 2019
922330a
create now_dt var
tranctan Dec 10, 2019
d753146
Merge remote-tracking branch 'upstream/master' into dfgroupbyshift-tz…
tranctan Dec 10, 2019
f4d89ab
move to test_groupby.py
tranctan Dec 10, 2019
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9 changes: 9 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 @@ -1702,6 +1702,15 @@ def test_group_shift_with_fill_value():
tm.assert_frame_equal(result, expected)


def test_group_shift_lose_timezone():
# GH 30134
now_dt = pd.Timestamp.utcnow()
df = DataFrame({"a": [1, 1], "date": now_dt})
result = df.groupby("a").shift(0).iloc[0]
expected = Series({"date": now_dt}, name=result.name)
tm.assert_series_equal(result, expected)


def test_pivot_table_values_key_error():
# This test is designed to replicate the error in issue #14938
df = pd.DataFrame(
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