python----抽象类

#!/usr/local/python3.5/bin/python3.5

####实现方法一
class Supper(object):
def delegate(self):
self.action()

def action(self):
raise NotImplementedError("you must implement Supper.action function")

class Sub(Supper):
pass

####实现方法二

from abc import ABCMeta
from abc import abstractmethod

class Supper2(metaclass=ABCMeta):
def delegate(self):
self.action()
@abstractmethod
def action(self):
pass

class Sub2(Supper2):
def action(self):
print('hello world!')

if __name__=="__main__":

s=Sub2()
s.delegate();