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mypy infers nonexistent class attribute from instance attribute #7524

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untitaker opened this issue Sep 17, 2019 · 1 comment

untitaker commented Sep 17, 2019

The following typechecks correctly with mypy 0.720, but blows up at runtime:

from typing import Type

class A(object):
    both = 42  # type: int

    def __init__(self):
        # type: () -> None
        self.instance_only = 42  # type: int


a = A()  # type: A
b = A  # type: Type[A]

print(a.both)
print(b.both)

print(a.instance_only)
print(b.instance_only)  # AttributeError

Collaborator

JukkaL commented Sep 20, 2019

Closing as duplicate of #1097.

JukkaL closed this as completed

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