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()