Python检查实例与键入

Question

有没有内置的方法或最佳实践来使用typing库检查容器类型？ 我想看看：

from typing import List
isinstance([1,2,3], List[int])

一般问题是使用相同语法的不同行为：

In [22]: isinstance([1,2], List)
Out[22]: True

In [23]: isinstance([1,2], List[int])
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-23-8598eb948ef8> in <module>()
----> 1 isinstance([1,2], List[int])

/usr/lib/python3.7/typing.py in __instancecheck__(self, obj)
    706 
    707     def __instancecheck__(self, obj):
--> 708         return self.__subclasscheck__(type(obj))
    709 
    710     def __subclasscheck__(self, cls):

/usr/lib/python3.7/typing.py in __subclasscheck__(self, cls)
    714             if cls._special:
    715                 return issubclass(cls.__origin__, self.__origin__)
--> 716         raise TypeError("Subscripted generics cannot be used with"
    717                         " class and instance checks")
    718 

TypeError: Subscripted generics cannot be used with class and instance check```