类型提示:类型类的参数 [英] Type Hinting: Argument Of Type Class

问题描述

我正在定义一个方法

def foo_my_class(my_class: ???, bar: str) -> None:
    """ Operate on my_class """

我想知道，如何使用类型提示功能来指定应在第一个参数中传递该类.

I wonder, how can I use type hinting feature to specify that class should be passed in the first argument.

基本上，我应该在那里放什么而不是 ??? 标记?

Basically, what should I put instead of ??? mark up there?

这里还有一些代码，可以更具体地说明我要实现的目标.

Here is some more code to be more specific on what I am trying to achieve.

class Base(object):
   """base class"""

class X(Base):
    """some class"""

class Y(Base):
    """some other class"""   

foo_my_class(X, "foo")    
foo_my_class(Y, "bar")

推荐答案

您只需使用类本身.

def foo_my_class(my_class: MyClass, bar: str) -> None:

来自PEP(重点是我的):

类型提示可以是内置类(包括在标准库或第三方扩展模块中定义的类)、抽象基类、types 模块中可用的类型和用户-定义的类(包括在标准库或第三方模块中定义的类).

Type hints may be built-in classes (including those defined in standard library or third-party extension modules), abstract base classes, types available in the types module, and user-defined classes (including those defined in the standard library or third-party modules).

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