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GH-124549: Add a note that when over-specifying datetime format, only the last directive gets used. #125009

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GH-124549: Add a note that when over-specifying datetime format, only the last directive gets used. #125009

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8 changes: 8 additions & 0 deletions Doc/library/datetime.rst
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Expand Up @@ -2761,6 +2761,14 @@ Notes:
:exc:`DeprecationWarning`. In 3.15 or later we may change this into
an error or change the default year to a leap year. See :gh:`70647`.

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Is a note here the best place for this?

When parsing a string using :meth:`~.datetime.strptime`, if more than one
directives of the same time unit were used, only the last directive gets parsed
and applied to the datetime object. For example, if the format string contains
both ``%Y`` and ``%y``, like ``%Y%y``, only the last directive on the string (``%y``)
gets used on the resulting datetime object.


.. rubric:: Footnotes

.. [#] If, that is, we ignore the effects of Relativity
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