broken-collections-callable / E6005

Message emitted:

'collections.abc.Callable' inside Optional and Union is broken in 3.9.0 / 3.9.1 (use 'typing.Callable' instead)

Description:

``collections.abc.Callable`` inside Optional and Union is broken in Python 3.9.0 and 3.9.1. Use ``typing.Callable`` for these cases instead. https://bugs.python.org/issue42965

Problematic code:

from collections.abc import Callable
from typing import Optional


def func() -> Optional[Callable[[int], None]]:  # [broken-collections-callable]
    ...

Correct code:

from typing import Callable, Optional


def func() -> Optional[Callable[[int], None]]: ...

Configuration file:

[main]
py-version=3.9
load-plugins=pylint.extensions.typing

Related links:

• bpo-42965

Note

This message is emitted by the optional 'typing' checker, which requires the pylint.extensions.typing plugin to be loaded.

Created by the typing checker.