python 类中输入继承

Question

我真的很喜欢在 python 中使用类型提示，所以我正在努力增加我的理解。在下面提供的场景中，BASE_CLASS = BASE[ENV] 和 BASE[ENV] 应始终具有相同的类型。那么为什么当Extract直接继承BASE[ENV]时类型提示没有被注释。

#app/base.py
from typing import Literal
import request


class Base:

    def get_yerp(self):  # ...
        return self._load_yerp()

    def _load_yerp(self) -> Literal['YERP']: ...


class Production(Base):

    def _load_yerp(self):
        with request(...)



class Development(Base):

    def _load_yerp(self):
        with open(...)

#app/extract.py
import os
from typing import Dict, Type, Literal
from app import base

ENV: Literal['production', 'development'] = os.getenv('ENV', 'development')

BASE: Dict[str, Type[base.Base]] = {
    'production': base.Production,
    'development': base.Development
}

BASE_CLASS = BASE[ENV]


class Extract1(BASE_CLASS):

    def __init__(self):
        super().get_yerp()#type hint=(method) get_yerp: () -> Literal['YERP']

class Extract2(BASE[ENV]):

    def __init__(self):
        super().get_yerp()#type hint=Any