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gh-152636: Add a note that frozendict is preferable than MappingProxyType #152637

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gh-152636: Add a note that frozendict is preferable than MappingProxyType #152637

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7 changes: 7 additions & 0 deletions Doc/library/types.rst
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Expand Up @@ -390,6 +390,13 @@ Standard names are defined for the following types:
signifying (respectively) the types of the underlying mapping's keys and
values.

.. warning::

``MappingProxyType`` can expose its internal mapping
in some rare cases on some versions of Python.
Starting from Python 3.15 it is recommeneded
to use truly immutable :class:`frozendict` instead.

@vstinner vstinner Jun 30, 2026

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I don't think that a "warning" is justified here, a "note" would be enough.

For the second sentence, maybe only recommend frozendict to "store sensitive information".


.. versionadded:: 3.3

.. versionchanged:: 3.9
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