8000 BUG: preserve fold in Timestamp.replace by AlexKirko · Pull Request #37644 · pandas-dev/pandas · GitHub
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BUG: preserve fold in Timestamp.replace #37644

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Merged
merged 9 commits into from
Nov 8, 2020
Merged

BUG: preserve fold in Timestamp.replace #37644

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30f7275
BUG: preserve fold in Timestamp.replace
AlexKirko Nov 5, 2020
b2745e1
DOC: add whatsnew
AlexKirko Nov 5, 2020
096ee9b
TST: add test
AlexKirko Nov 5, 2020
b9fa491
DOC: mirror doc change for NaT
AlexKirko Nov 5, 2020
b4c4127
TST: move the test
AlexKirko Nov 5, 2020
7c2f782
TST: improve test readability
AlexKirko Nov 5, 2020
2ca31ca
TST: incorporate reviewer suggestions
AlexKirko Nov 5, 2020
4719697
TST: replace second instead of fold
AlexKirko Nov 5, 2020
ada4d94
TST: tzinfo instead of tz in the test
AlexKirko Nov 6, 2020
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TST: incorporate reviewer suggestions
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@AlexKirko
AlexKirko committed Nov 5, 2020
commit 2ca31caa7f6f49a16a282efd8efeb6f9a50461ee
11 changes: 5 additions & 6 deletions pandas/tests/scalar/timestamp/test_unary_ops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -426,13 +426,12 @@ def test_timestamp(self):
assert dt.timestamp() == ts.timestamp()


def test_replace_preserves_fold():
@pytest.mark.parametrize("fold", [0, 1])
def test_replace_preserves_fold(fold):
# GH 37610. Check that replace preserves Timestamp fold property
tz = gettz("Europe/Moscow")

dt = datetime(year=2009, month=10, day=25, hour=2, minute=30, fold=1, tzinfo=tz)
ts = Timestamp(year=2009, month=10, day=25, hour=2, minute=30, fold=1, tz=tz)
result = ts.replace(tzinfo=tz).fold
expected = dt.replace(tzinfo=tz).fold
ts = Timestamp(year=2009, month=10, day=25, hour=2, minute=30, fold=fold, tz=tz)
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Why tz= instead of tzinfo=? I seem to remember that there are vague plans to remove tz= as redundant or something?

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tz kwarg allows for a string whereas tzinfo requires a tzinfo object

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But that's not what's happening here...

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@AlexKirko AlexKirko Nov 6, 2020 •
edited
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Thanks, agreed. Passing a tzinfo object into the tz argument gives the same result (as all tzinfo gives us is a Cython type-check before we set tz, tzinfo = tzinfo, None), but passing tzinfo is more readable and doc-compliant.
Changed it, please take a look.

ts_replaced = ts.replace(tzinfo=tz)

assert result == expected
assert ts_replaced.fold == fold
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