class Animal:
    def __init__(self,name):
        self.name=name
    def speak(self):
        pass
class Dog(Animal):
    def __init__(self,name):
        super().__init__(name)
    def speak(self):
        print("狗会狗叫")
class Cat(Animal):
    def __init__(self,name):
        super().__init__(name)
    def speak(self):
        print("猫会猫叫")
a=Dog("狗")
a.speak()
b=Cat('猫')
b.speak()