py_继承(样例)

class Animal:
    def eat(self):
        print("--吃--")
    def drink(self):
        print("--喝--")
    def sleep(self):
        print("--睡觉--")
    def run(self):
        print("--跑--")

class Dog(Animal):
    def bark(self):
        print("--汪汪叫--")

class Cat(Animal):
    def work(self):
        print("--抓老鼠--")
class Xiaotianq(Dog):
    def fly(self):
        print("--飞--")

a=Animal()
a.eat()
wangcai=Dog()
wangcai.eat()
miao=Cat()
miao.eat()
xiapt=Xiaotianq()
xiapt.fly()
xiapt.bark()
xiapt.eat()