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fix: scalar timestamp assignment (#19843) #19973

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merged 7 commits into from
Aug 2, 2018
Merged

fix: scalar timestamp assignment (#19843) #19973

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5a9b1b9
fix: scalar timestamp assignment (#19843)
DylanDmitri Mar 2, 2018
601cf54
moved tests
DylanDmitri Mar 2, 2018
33f8651
issue number in tests
DylanDmitri Mar 2, 2018
59069b9
added whatsnew
DylanDmitri Mar 3, 2018
edcb4e2
Merge branch 'master' into PR_TOOL_MERGE_PR_19973
jreback Aug 2, 2018
c48fbe9
update docs
jreback Aug 2, 2018
1b9649c
clean
jreback Aug 2, 2018
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.24.0.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -559,6 +559,7 @@ Timezones
- Bug in :class:`DatetimeIndex` where constructing with an integer and tz would not localize correctly (:issue:`12619`)
- Fixed bug where :meth:`DataFrame.describe` and :meth:`Series.describe` on tz-aware datetimes did not show `first` and `last` result (:issue:`21328`)
- Bug in :class:`DatetimeIndex` comparisons failing to raise ``TypeError`` when comparing timezone-aware ``DatetimeIndex`` against ``np.datetime64`` (:issue:`22074`)
- Bug in ``DataFrame`` assignment with a timezone-aware scalar (:issue:`19843`)

Offsets
^^^^^^^
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9 changes: 7 additions & 2 deletions pandas/core/frame.py
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Expand Up @@ -27,6 +27,7 @@
maybe_upcast,
cast_scalar_to_array,
construct_1d_arraylike_from_scalar,
infer_dtype_from_scalar,
maybe_cast_to_datetime,
maybe_infer_to_datetimelike,
maybe_convert_platform,
Expand Down Expand Up @@ -3507,9 +3508,13 @@ def reindexer(value):
value = maybe_infer_to_datetimelike(value)

else:
# upcast the scalar
# cast ignores pandas dtypes. so save the dtype first
infer_dtype, _ = infer_dtype_from_scalar(
value, pandas_dtype=True)

# upcast
value = cast_scalar_to_array(len(self.index), value)
value = maybe_cast_to_datetime(value, value.dtype)
value = maybe_cast_to_datetime(value, infer_dtype)

# return internal types directly
if is_extension_type(value) or is_extension_array_dtype(value):
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8 changes: 8 additions & 0 deletions pandas/tests/frame/test_indexing.py
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Expand Up @@ -3135,6 +3135,14 @@ def test_transpose(self):
expected.index = ['A', 'B']
assert_frame_equal(result, expected)

def test_scalar_assignment(self):
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Reference issue number for both tests.

# issue #19843
df = pd.DataFrame(index=(0, 1, 2))
df['now'] = pd.Timestamp('20130101', tz='UTC')
expected = pd.DataFrame(
{'now': pd.Timestamp('20130101', tz='UTC')}, index=[0, 1, 2])
tm.assert_frame_equal(df, expected)


class TestDataFrameIndexingUInt64(TestData):

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