mark收藏一下
博客原文
class Animal(object): #编写Animal类
def run(self):
print("Animal is running...")
class Dog(Animal): #Dog类继承Amimal类，没有run方法
pass
class Cat(Animal): #Cat类继承Animal类，有自己的run方法
def run(self):
print('Cat is running...')
pass
class Car(object): #Car类不继承，有自己的run方法
def run(self):
print('Car is running...')
class Stone(object): #Stone类不继承，也没有run方法
pass
def run_twice(animal):
animal.run()
animal.run()
run_twice(Animal())
run_twice(Dog())
run_twice(Cat())
run_twice(Car())
run_twice(Stone())
#输出结果： Animal is running... Animal is running... Animal is running... Animal is running... Cat is running... Cat is running... Car is running... Car is running... AttributeError: 'Stone' object has no attribute 'run'
除石头吃了不会跑的亏外，其余的都能run，都是“鸭子”。
