继承的重写与扩展

class Animal:
    def eat(self):
        print("吃")

    def drink(self):
        print("喝")

    def run(self):
        print("跑")

    def sleep(self):
        print("睡")

class Dog(Animal):
    def bark(self):
        print("叫")

class XiaoTianQuan(Dog):
    def fly(self):
        print("飞")

    # def bark(self):
    #     print("像神一样叫")
    #
    #     # 调用父类bark方法
    #     super().bark()
    #
    #     # 扩展
    #     print("!@$#@@(*U!(")

    # python2.x的扩展和重写
    def bark(self):

        print("像神一样叫")

        Dog.bark(self)

        print("@#$@#R@")

xtq = XiaoTianQuan()
xtq.eat()
xtq.bark()
xtq.fly()

吃
像神一样叫
叫
@#$@#R@
飞