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vstinner merged 2 commits into from
Feb 19, 2026
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gh-141510: Document ParameterizedMIMEHeader.params change #145003

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gh-141510: Document ParameterizedMIMEHeader.params change
vstinner Feb 19, 2026
ddd1464
Document the dataclasses.field() change
vstinner Feb 19, 2026
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Document the dataclasses.field() change
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@vstinner
vstinner committed Feb 19, 2026
commit ddd1464fce06eaadf6e2028d3f748f78bfc2c6dc
4 changes: 4 additions & 0 deletions Doc/library/dataclasses.rst
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Expand Up @@ -333,6 +333,10 @@ Module contents
:attr:`!C.t` will be ``20``, and the class attributes :attr:`!C.x` and
:attr:`!C.y` will not be set.

.. versionchanged:: next
If *metadata* is ``None``, use an empty :class:`frozendict`, instead
of a :func:`~types.MappingProxyType` of an empty :class:`dict`.

.. class:: Field

:class:`!Field` objects describe each defined field. These objects
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-02-19-18-02-54.gh-issue-141510.qzvYsO.rst
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@@ -0,0 +1,3 @@
:func:`dataclasses.field`: if *metadata* is ``None``, use an empty
:class:`frozendict`, instead of a :func:`~types.MappingProxyType` of an
empty :class:`dict`. Patch by Victor Stinner.
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