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(🐞) | operator with _SpecialForm determined to be types.UnionType it's actually typing.Union #12369

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KotlinIsland opened this issue Mar 17, 2022 · 0 comments
Open

(🐞) | operator with _SpecialForm determined to be types.UnionType it's actually typing.Union #12369

KotlinIsland opened this issue Mar 17, 2022 · 0 comments
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bug mypy got something wrong topic-pep-604 PEP 604 (union | operator)

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@KotlinIsland
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KotlinIsland commented Mar 17, 2022 •
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from typing import Any

print(reveal_type(int | Any))  #  types.UnionType
> python test.py
typing.Union[int, typing.Any]

This causes issues with isinstance, despite the fact that isinstance can take a typing.Union.

from typing import Any

isinstance(1, str | Any)  # no error
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bug mypy got something wrong topic-pep-604 PEP 604 (union | operator)
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@JelleZijlstra @KotlinIsland