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gh-132139: Document that you can no longer set attributes on unions (#132146)

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Jelle Zijlstra 2025-04-06 05:43:09 -07:00 • committed by GitHub
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Doc/whatsnew/3.14.rst
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@ -1130,6 +1130,8 @@ typing
For example, ``isinstance(int | str, typing.Union)`` will return ``True``; previously
this raised :exc:`TypeError`.
- The ``__args__`` attribute of :class:`typing.Union` objects is no longer writable.
- It is no longer possible to set arbitrary dunder attributes on :class:`typing.Union`
objects.
(Contributed by Jelle Zijlstra in :gh:`105499`.)