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invalid error when using a `TypeVar` in a `Callable` annotation on a variable #930

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KotlinIsland opened this issue Dec 6, 2024 · 0 comments

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type checking / linting

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KotlinIsland commented Dec 6, 2024 •

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this is an issue with deprecated functionality

from typing import Callable, TypeVar

T = TypeVar("T")
bar: Callable[
       [T],   # Type variable "T" has no meaning in this context reportGeneralTypeIssues
       T,   # Type variable "T" has no meaning in this context reportGeneralTypeIssues
    ] = lambda x: x

reveal_type(bar)

this is deprecated, the new way of doing this is:

class Bar(Protocol):
    def __call__[T](self, t: T, /) -> T: ...

bar: Bar = lambda x: x

which does not present the same error

KotlinIsland added the type checking / linting label

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