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[3.13] gh-57095: Add note about input splitting in `datetime.*.strptime` (GH-131049) by miss-islington · Pull Request #144734 · python/cpython · GitHub

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[3.13] gh-57095: Add note about input splitting in datetime.*.strptime (GH-131049) #144734

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encukou merged 1 commit into from
Feb 12, 2026
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[3.13] gh-57095: Add note about input splitting in datetime.*.strptime (GH-131049) #144734

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6 changes: 6 additions & 0 deletions Doc/library/datetime.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2591,6 +2591,12 @@ For the :meth:`.datetime.strptime` class method, the default value is
``1900-01-01T00:00:00.000``: any components not specified in the format string
will be pulled from the default value.

.. note::
Format strings without separators can be ambiguous for parsing. For
example, with ``%Y%m%d``, the string ``2026111`` may be parsed either as
``2026-11-01`` or as ``2026-01-11``.
Use separators to ensure the input is parsed as intended.

.. note::
When used to parse partial dates lacking a year, :meth:`.datetime.strptime`
will raise when encountering February 29 because the default year of 1900 is
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