8000 Union not being recognized as types.UnionType · Issue #13810 · python/mypy · GitHub
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Union not being recognized as types.UnionType #13810
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Union not being recognized as types.UnionType#13810
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bugmypy got something wrongtopic-pep-604PEP 604 (union | operator)topic-runtime-semanticsmypy doesn't model runtime semantics correctly
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@nickeldan
nickeldan
opened on Oct 4, 2022

In this example,

Foo = str | int
reveal_type(Foo)

mypy (0.990, Python 3.10.6) reveals the type as builtins.object. It should be recognized as types.UnionType (new in Python 3.10).

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