python的内置方法 isinstance && issubclass

isinstance  :  判断一个对象是一个类的实例

# isinstance:
# class Foo:
#     pass
#
# class Boo:
#     pass
#
# foo_obj = Foo()
# boo_obj = Boo()
#
# print(isinstance(foo_obj, Foo))  # True
# print(isinstance(boo_obj, Foo))  # False

issubclass :  判断一个类是另一个类的子类

# issubclass
class Father:
    pass


class Sub(Father):
    pass


class Foo:
    pass


print(issubclass(Sub, Father))  # True
print(issubclass(Foo, Father))  # False