issubclass() 是给定类的子类吗？

内置函数 issubclass()，Python 官方文档描述如下：

help(issubclass)

Help on built-in function issubclass in module builtins:

issubclass(cls, class_or_tuple, /)
    Return whether 'cls' is a derived from another class or is the same class.
    
    A tuple, as in ``issubclass(x, (A, B, ...))``, may be given as the target to
    check against. This is equivalent to ``issubclass(x, A) or issubclass(x, B)
    or ...`` etc.

如果类 cls 是给定类的 (直接、间接或虚拟) 子类则返回 True，不是则返回 False。给定的不是类则引发 TypeError 异常。

给定类可以以元组形式传参，cls 是其中任何一个类的子类就返回 True。

issubclass(1, int) # 1 不是类

---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

<ipython-input-2-257e7a8dbb04> in <module>
----> 1 issubclass(1, int)


TypeError: issubclass() arg 1 must be a class

issubclass(bool, int)

True

issubclass(bool, (set, str, list))

False

# 所有的类都是 object 的子类
class A:pass
issubclass(A, object),\
issubclass(str, object),\
issubclass(object, object)

(True, True, True)