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Confusing error when argument 2 of isinstance is alias to Any #7478

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JukkaL opened this issue Sep 6, 2019 · 1 comment
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Confusing error when argument 2 of isinstance is alias to Any #7478

JukkaL opened this issue Sep 6, 2019 · 1 comment
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bug mypy got something wrong good-first-issue priority-1-normal topic-usability

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@JukkaL
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JukkaL commented Sep 6, 2019

The error generated in the following example doesn't make much sense:

from typing import Any
A = Any
isinstance(object(), A)  # Parameterized generics cannot be used with class or instance checks
@ilevkivskyi
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Runtime error is much better: TypeError: Any cannot be used with isinstance()

@ckarnell ckarnell mentioned this issue Sep 12, 2019
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@JukkaL JukkaL closed this as completed in 8782ae7 Sep 16, 2019
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