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#!/usr/bin/env python3

# -*- coding: utf-8 -*-

'练习面向对象的继承和多态'

__author__ = 'sergiojune'

class Animal(object):

def run(self):

print('animal is running')

# 继承Animal类

class Dog(Animal):

# 重载父类的方法

def run(self):

print('Dog is running')

class Cat(Animal):

def run(self):

print('cat is running')

def run_twich(animal):

animal.run()

animal.run()

animal = Animal()

dog = Dog()

cat = Cat()

# 类继承了Animal，所以类中不需要实现任何东西都可以有父类方法

animal.run()

dog.run()

cat.run()

# 这个方法只要是有run方法都可以运行,这就是多态的实现

# 看起来像鸭子，走起路来像鸭子，那这个就是鸭子，这就是鸭子类型，动态语言的鸭子类型

run_twich(animal)

run_twich(dog)

run_twich(cat)