class Animal:

    def __init__(self,name):

        self.name = name

    def eat(self):

        pass

from animal import Animal

class Dog(Animal):

    def __init__(self,name):

        super().__init__(name)

    def eat(self):

        print(self.name + '正在进食...')

from animal import Animal

class Cat(Animal):

    def __init__(self,name):

        super().__init__(name)

    def eat(self):

        print(self.name + "正在进食...")

class Person:

    #人喂狗

    def feedDog(self,dog):

        dog.eat()

    #人喂猫

    def feedCat(self,cat):

        cat.eat()

    def feedAnimal(self,animal):

        animal.eat()

from person import Person

from dog import Dog

from cat import Cat

'''

测试模块

演示多态的使用：

'''

#实例化人、狗、猫对象

p = Person()

d = Dog('旺旺')

c = Cat('咪咪')

p.feedDog(d)

p.feedCat(c)

p.feedAnimal(d)

p.feedAnimal(c)