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[spec] a protocol type should be assignable to object? #1780

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carljm opened this issue Jun 17, 2024 · 1 comment

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topic: typing spec

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carljm commented Jun 17, 2024

See #1743 (comment)

carljm added the topic: typing spec label

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new "type system concepts" section #1743

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JelleZijlstra commented Jun 17, 2024

Mypy, pyre, and pyright all already allow protocol types to be assigned to object. Test program:

from typing import Protocol

def f(x: object) -> None:
    pass

def g(x: int) -> None:
    pass

class X(Protocol):
    foo: int

def h(x: X) -> None:
    f(x)  # OK: protocol is assignable to object
    g(x)  # E: protocol is not assignable to int

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