Python 内建函数 - issubclass(class, classinfo)

Manual

Return true if class is a subclass (direct, indirect or virtual) of classinfo. A class is considered a subclass of itself. classinfo may be a tuple of class objects, in which case every entry in classinfo will be checked. In any other case, a TypeError exception is raised.

直译

如果class是classinfo的一个子类（直接、间接或虚拟）则返回True。一个类通常被认为是它自身的子类，classinfo可以是一个类对象的元组，其中每个输入的类都会被检查到，在其他所有情况下都会引发TypeError异常。

实例

>>> class 优快云:
    def __init__(self):
        print('Hello 优快云er!')
>>> class 优快云er(优快云):
    def __init__(self):
        print('Hello world!')

>>> issubclass(优快云, 优快云)
True
>>> issubclass(优快云er, 优快云)
True

>>> class Topic:
    def foobar(self):
        print('issubclass')
>>> issubclass(优快云er, Topic)
False

>>> c = (优快云, Topic)
>>> issubclass(优快云er, c)
True

拓展阅读

isinstance()