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gh-132139: 3.14 what's new: elaborate on why you can no longer set Union attributes (#132157)

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Alex Waygood 2025-04-06 16:51:05 +01:00 • committed by GitHub
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@ -1130,8 +1130,9 @@ 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.
- It is no longer possible to set any attributes on :class:`typing.Union` objects.
This only ever worked for dunder attributes on previous versions, was never
documented to work, and was subtly broken in many cases.
(Contributed by Jelle Zijlstra in :gh:`105499`.)