Python继承和多态

python继承与多态，程序测试一个动物类，两个子类dog、cat。

def run_twice(animal):
    animal.run()
    animal.run()
    
class animal(object):
    def run(self):
        print('animal is running')
    #动物类

class dog(animal):
    def run(self):
        print('dog is running...')
    def eat(self):
        print('eating meat...')
    #狗类
class cat(animal):
    def run(self):
        print('cat is running')
    #猫类
dog = dog()
dog.run()
dog.eat()

cat = cat()
cat.run()

run_twice(dog())

读书和健身总有一个在路上