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gh-70647: Better promote how to safely parse yearless dates in datetime. #116179

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Merged
gpshead merged 10 commits into from
Dec 21, 2025
Merged

gh-70647: Better promote how to safely parse yearless dates in datetime. #116179

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d87b20a
gh-70647: Better promote how to safely parse yearless dates in datetime.
gpshead Mar 1, 2024
11f01a3
doctest code within note is bad, dedent.
gpshead Mar 1, 2024
1f07bc6
Merge branch 'main' into docs/datetime/02-29
gpshead Mar 21, 2025
4860a00
Update to match the error message.
gpshead Mar 21, 2025
9c0d4f8
remove no longer referenced footnote
gpshead Mar 21, 2025
8c6fd9b
ignore the warning in the doctest
gpshead Mar 21, 2025
630b32c
Merge branch 'main' into docs/datetime/02-29
gpshead Jun 15, 2025
020ac63
Merge branch 'main' into docs/datetime/02-29
gpshead Dec 21, 2025
6330e73
use Petr's suggestion for the docs to hide the warning processing
gpshead Dec 21, 2025
e29e51a
cover date.strptime (3.14) as well
gpshead Dec 21, 2025
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use Petr's suggestion for the docs to hide the warning processing
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@gpshead
gpshead committed Dec 21, 2025
commit 6330e733ab64d731213fd0c6f970729b66aee317
22 changes: 17 additions & 5 deletions Doc/library/datetime.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2661,15 +2661,27 @@ will be pulled from the default value.
*not* a leap year. Always add a default leap year to partial date strings
before parsing.


.. testsetup::

# doctest seems to turn the warning into an error which makes it
# show up and require matching and prevents the actual interesting
# exception from being raised.
# Manually apply the catch_warnings context manager
import warnings
catch_warnings = warnings.catch_warnings()
catch_warnings.__enter__()
warnings.simplefilter("ignore")

.. testcleanup::

catch_warnings.__exit__()

.. doctest::

>>> from datetime import datetime
>>> import warnings
>>> value = "2/29"
>>> with warnings.catch_warnings():
... warnings.simplefilter("ignore")
... datetime.strptime(value, "%m/%d")
...
>>> datetime.strptime(value, "%m/%d")
Traceback (most recent call last):
...
ValueError: day 29 must be in range 1..28 for month 2 in year 1900
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