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gh-141510: Document isinstance change for frozendict in What's New #146107

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Mar 18, 2026
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gh-141510: Document isinstance change for frozendict in What's New #146107

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5 changes: 5 additions & 0 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -221,6 +221,11 @@ The following standard library modules have been updated to accept
:func:`eval` and :func:`exec` accept :class:`!frozendict` for *globals*, and
:func:`type` and :meth:`str.maketrans` accept :class:`!frozendict` for *dict*.

Code checking for :class:`dict` type using ``isinstance(arg, dict)`` can be
updated to ``isinstance(arg, (dict, frozendict))`` to accept also the
:class:`!frozendict` type, or to ``isinstance(arg, collections.abc.Mapping)``
to accept also other mapping types such as :class:`~types.MappingProxyType`.

.. seealso:: :pep:`814` for the full specification and rationale.

(Contributed by Victor Stinner and Donghee Na in :gh:`141510`.)
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