#一个接口，多种实现#实现接口的重用class Animal:    def __init__(self, name):  # Constructor of the class        self.name = name    def talk(self):  # Abstract method, defined by convention only        pass #raise NotImplementedError("Subclass must implement abstract method")#这里就是多态的实现    @staticmethod    def animal_talk(obj):        obj.talk()class Cat(Animal):    def talk(self):        print('Meow!')class Dog(Animal):    def talk(self):        print('Woof! Woof!')d = Dog("陈荣华")#d.talk()c = Cat("徐良伟")# c.talk()## def animal_talk(obj):#     obj.talk()Animal.animal_talk(c)Animal.animal_talk(d)