抽象类与归一化

import abc

class Animal(metaclass=abc.ABCMeta):  # 只能被继承，不能被实例化
    @abc.abstractmethod
    def run(self):
        pass

    @abc.abstractmethod
    def eta(self):
        pass


class Pople(Animal):

    def run(self):
        print('Pople is runing')


    def eta(self):
        print('Pople is etaing')

class Pig(Animal):

    def run(self):
        print('Pig is runing ')

    def eta(self):

        print('Pig is etaing')

class Dog(Animal):

    def run(self):
        print('Dog is runing ')


    def eta(self):
        print('Dog is etaing')



pople1 =Pople()
pig1 = Pig()
dog1 = Dog()