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(🐞) no error with | operator on tuple and type #15756

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KotlinIsland opened this issue Jul 24, 2023 · 1 comment
Open

(🐞) no error with | operator on tuple and type #15756

KotlinIsland opened this issue Jul 24, 2023 · 1 comment
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bug mypy got something wrong topic-pep-604 PEP 604 (union | operator) topic-runtime-semantics mypy doesn't model runtime semantics correctly

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@KotlinIsland
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KotlinIsland commented Jul 24, 2023 •
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() | int  # no error
int | (int,)  # no error
@KotlinIsland KotlinIsland added the bug mypy got something wrong label Jul 24, 2023
@AlexWaygood AlexWaygood added topic-pep-604 PEP 604 (union | operator) topic-runtime-semantics mypy doesn't model runtime semantics correctly labels Jul 24, 2023
@erictraut
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Based on the type information in typeshed, mypy is correct to not generate an error here. That's because tuple includes a __ror__ method that has a parameter of type Any. It may be a reasonable enhancement request for mypy to override typeshed and special case these conditions, but I wouldn't consider this a bug.

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bug mypy got something wrong topic-pep-604 PEP 604 (union | operator) topic-runtime-semantics mypy doesn't model runtime semantics correctly
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@erictraut @KotlinIsland @AlexWaygood