https://github.com/python/cpython/commit/fd6ed15a894dcc426da3d4d6cc9f297573b2c83e commit: fd6ed15a894dcc426da3d4d6cc9f297573b2c83e branch: main author: Mariatta <[email protected]> committer: Mariatta <[email protected]> date: 2026-10-20T12:23:37-07:00 summary:
gh-124549: Document that `strptime()` uses the last directive when a time unit is over-specified (#125009) * Add a note that when over-specifying datetime format, only the last directive gets used. * adjust and reorganize the notes location, fast forward to latest. * Update Doc/library/datetime.rst Co-authored-by: Stan Ulbrych <[email protected]> --------- Co-authored-by: Stan Ulbrych <[email protected]> files: M Doc/library/datetime.rst diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst index f3c4ef9199075c..dd25200f73d474 100644 --- a/Doc/library/datetime.rst +++ b/Doc/library/datetime.rst @@ -2745,6 +2745,13 @@ in the format string will be pulled from the default value. the default year of 1900 is *not* a leap year. Always add a default leap year to partial date strings before parsing. +.. note:: + If a :meth:`~.datetime.strptime` format string contains more than + one directive for the same field, for example both ``%Y`` and ``%y``, + every directive must still match the input, but only the value of the + last one is used. For example, parsing ``200099`` with ``%Y%y`` gives + the year 1999. Repeating the same directive, like ``%Y%Y``, raises an error. + .. testsetup:: # doctest seems to turn the warning into an error which makes it _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
