#-*- coding:utf-8 -*-
from abc import abstractmethod,ABCMeta
class Swim_Animal(metaclass=ABCMeta):
    @abstractmethod
    def swim(self):pass
class Walk_Animal(metaclass=ABCMeta):
    @abstractmethod
    def walk(self):pass
class Fly_Animal(metaclass=ABCMeta):
    @abstractmethod
    def fly(self):pass
#上面规范不需要些代码、只起到规范作用
class Tiger(Walk_Animal,Swim_Animal):
    def walk(self):         #接口类规范、继承Walk_Animal,Swim_Animal、必须按照父类的规范来写、如果此处名字不为walk就报错
        print('老虎走路')
    def swim(self):        #继承了Swim_Animal、不使用Swim_Animal里的名字就会报错(规范)
        print('老虎游泳')
class OldYing(Fly_Animal,Walk_Animal):pass
class Swan(Swim_Animal,Walk_Animal,Fly_Animal):pass
tiger = Tiger()
tiger.walk()
tiger.swim()