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[3.15] gh-139806: Mention pickle error changes in What's New in 3.14 (GH-154020) #154161

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serhiy-storchaka merged 1 commit into from
Jul 19, 2026
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[3.15] gh-139806: Mention pickle error changes in What's New in 3.14 (GH-154020) #154161

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10 changes: 10 additions & 0 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -3310,6 +3310,16 @@ Changes in the Python API
This temporary change affects other threads.
(Contributed by Serhiy Storchaka in :gh:`69998`.)

* :func:`pickle.dump` and :func:`pickle.dumps` now raise
:exc:`~pickle.PicklingError` for some failures that previously raised
:exc:`AttributeError`, :exc:`ImportError`, :exc:`ValueError`,
:exc:`UnicodeEncodeError` or :exc:`!PicklingError`,
depending on the implementation
(for example, pickling a local object, or an object whose module cannot be imported).
The original exception is chained to the :exc:`!PicklingError`.
Code that caught these exceptions should also catch :exc:`!PicklingError`.
(Contributed by Serhiy Storchaka in :gh:`122311`.)

* :class:`types.UnionType` is now an alias for :class:`typing.Union`,
causing changes in some behaviors.
See :ref:`above <whatsnew314-typing-union>` for more details.
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