Shared via mypy Playground

main.py

from typing import Any, cast
from enum import Enum


class Message:
    class Direction(Enum):
        IN = "IN"
        OUT = "OUT"


class MetaProtoWrapper(type):
    def __getattribute__(cls, name: str):
        try:
            return super().__getattribute__(name)
        except AttributeError:
            return getattr(cls.Meta.protocol_buffer_type, name)


class ProtoWrapper(metaclass=MetaProtoWrapper):
    class Meta:
        protocol_buffer_type = Message


direction_in: ProtoWrapper.Direction = ProtoWrapper.Direction.IN  # Name "ProtoWrapper.Direction" is not defined  [name-defined]