python3面对像进阶--isinstance(obj,cls)和issubclass(sub,super)

isinstance(obj,cls)  检查obj对象是不是cls类 的对象

class Foo(object):

    pass

f1 = Foo()

print(isinstance(f1,Foo))    # True

issubclass(sub,super) 检查sub类是不是 super 类的派生类

class Bar(Foo):

    pass

print(issubclass(Bar,Foo))    # True