21、多态

1、示例

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class Animal(object):

    def __init__(self, name):
        self.name = name

    def eat(self):
        print(self.name + "吃")

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from animal import Animal

class Cat(Animal):
    def __init__(self, name):
#        self.name = name
        super(Cat, self).__init__(name)

#    def eat(self):
#       print(self.name + "吃")


'''
不继承父类的写法

class Cat(object):
    def __init__(self, name):
        self.name = name

    def eat(self):
        print(self.name + "吃")

'''
------------------------------------

from animal import Animal

class Mouse(Animal):
    def __init__(self, name):
#        self.name = name
        super(Mouse, self).__init__(name)

#    def eat(self):
#       print(self.name + "吃")

------------------------------------

class Person(object):

    def feedAnimal(self, ani):
        print("给你实物")
        ani.eat()
'''

    def feedCat(self, cat):
        print("给你实物")
        cat.eat()

    def feedMouse(self, mouse):
        print("给你食物")
        mouse.eat()

'''
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from cat import Cat
from mouse import Mouse

from person import Person


'''
多态：一种事物的多种形态

最终目标：人可以喂任何一种动物


'''

tom  = Cat("tom")
jerry = Mouse("jerry")

#tom.eat()
#jerry.eat()

#思考：在添加100种动物，也都有name属性和eat方法
#定义了一个在name属性和eat方法的Animal类，让所有的动物类都继承自Animal

#定义一个人类，可以喂猫和老鼠吃东西

per = Person()

#per .feedCat(tom)
#per.feedMouse(jerry)

#思科：人要喂100种动物，难道要写100个feed方法吗？？？
#tom和jerry都继承自动物

per.feedAnimal(tom)