8000 BUG: DTI-datetime_scalar preserve freq by jbrockmendel · Pull Request #48818 · pandas-dev/pandas · GitHub
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BUG: DTI-datetime_scalar preserve freq #48818

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Merged
mroeschke merged 3 commits into from
Sep 28, 2022
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BUG: DTI-datetime_scalar preserve freq #48818

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BUG: DTI-datetime_scalar preserve freq
jbrockmendel Sep 27, 2022
f4d5328
GH ref
jbrockmendel Sep 27, 2022
4339bd5
add xfail test across DST boundary
jbrockmendel Sep 28, 2022
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@jbrockmendel
jbrockmendel committed Sep 27, 2022
commit f4d532887e5b11aeee3b883561a2f009f4bf0bd2
2 changes: 1 addition & 1 deletion doc/source/whatsnew/v1.6.0.rst
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Expand Up @@ -165,7 +165,7 @@ Datetimelike
^^^^^^^^^^^^
- Bug in :func:`pandas.infer_freq`, raising ``TypeError`` when inferred on :class:`RangeIndex` (:issue:`47084`)
- Bug in :class:`DatetimeIndex` constructor failing to raise when ``tz=None`` is explicitly specified in conjunction with timezone-aware ``dtype`` or data (:issue:`48659`)
- Bug in subtracting a ``datetime`` scalar from :class:`DatetimeIndex` failing to retain the original ``freq`` attribute (:issue:`?`)
- Bug in subtracting a ``datetime`` scalar from :class:`DatetimeIndex` failing to retain the original ``freq`` attribute (:issue:`48818`)

Timedelta
^^^^^^^^^
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1 change: 1 addition & 0 deletions pandas/tests/indexes/datetimes/test_datetime.py
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Expand Up @@ -18,6 +18,7 @@

class TestDatetimeIndex:
def test_sub_datetime_preserves_reso(self, tz_naive_fixture):
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@mroeschke mroeschke Sep 28, 2022

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Could you add a test where this goes over a DST transition?

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@jbrockmendel jbrockmendel Sep 28, 2022

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good catch. when we cross a DST transition, dti.freq is actually wrong bc of the (deprecated) kludge in generate_range. As a result, inheriting the freq is incorrect in this case. But it will return to being correct once the deprecation is enforced.

i think the thing to do is add the test and xfail it

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@jbrockmendel jbrockmendel Sep 28, 2022

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test added (and xfailed) + green

# GH#48818
dti = date_range("2016-01-01", periods=12, tz=tz_naive_fixture)

res = dti - dti[0]
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