# Python learning
# coding:utf-8


# 1.什么是多态：同一事物有多种形态

# 2.为何要有多态 ==>多态会带来什么样的特性，多态性

class Animal:   # 统一所有子类的方法
    def say(self):
        print('动物叫:', end='')


class People(Animal):
    def say(self):
        super().say()
        print('嘤嘤嘤')


class Dog(Animal):
    def say(self):
        super().say()
        print('汪汪汪')


class Pig(Animal):
    def say(self):
        super().say()
        print('哼哼哼')


obj_say1 = People()
# obj_say1.say()
obj_say2 = Dog()
# obj_say2.say()
obj_say3 = Pig()
# obj_say3.say()


# 定义统一的接口，接收传入的动物对象
def animal_say(animal):
    animal.say()


animal_say(obj_say1)
animal_say(obj_say2)
animal_say(obj_say3)


# 鸭子类型
class Cpu:
    def read(self):
        print('cpu read')

    def write(self):
        print('cpu write')


class Mem:
    def read(self):
        print('mem read')

    def write(self):
        print('mem write')


class Txt:
    def read(self):
        print('txt read')

    def write(self):
        print('txt write')


obj1 = Cpu()
obj2 = Mem()
obj3 = Txt()

obj1.read()
obj1.write()

obj2.read()
obj2.write()

obj3.read()
obj3.write()