8000 gh-132139: Document that you can no longer set attributes on unions by JelleZijlstra · Pull Request #132146 · python/cpython · GitHub
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gh-132139: Document that you can no longer set attributes on unions #132146

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Apr 6, 2025
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gh-132139: Document that you can no longer set attributes on unions #132146

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gh-132139: Document that you can no longer set attributes on unions 
Closes #132139.
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@JelleZijlstra
JelleZijlstra committed Apr 6, 2025
commit 7ab23c37023395cb479dd440a49daaa21a0db27c
2 changes: 2 additions & 0 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -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`.)

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