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())
输出结果如下:
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'
黑漆漆的四壁
按照教程,把课程代码大致改了改:
输出结果如下:
除石头吃了不会跑的亏外,其余的都能run,都是“鸭子”。