'None' used before definition

[miyoyo]

from typing import Any, Callable, Union, List

# Singleton example taken from 
# https://python-3-patterns-idioms-test.readthedocs.io/en/latest/Singleton.html
class OperationRepository:
    class __OperationRepository:
        def __init__(self) -> None:
            zeroValue = lambda a: print()
            self.operations: List[Callable[[Any], None]] = [zeroValue]
    instance: Union[None, __OperationRepository] = None
    def __init__(self):
        if not OperationRepository.instance:
            OperationRepository.instance = OperationRepository.__OperationRepository()
    def __getattr__(self, name):
        return getattr(self.instance, name)

This above code raises this

[JukkaL]

The message is not coming from mypy -- I'm pretty sure it's generated by some other tool.

[SmileyChris]

fyi @miyoyo you're using the MS Python Analysis Engine in VScode, and that's a known bug (#microsoft/python-language-server/issues/442) which was recently fixed, so should be in the next VScode release