代理模式

 1 class Girl(object):
 2     def __init__(self,name):
 3         self._name = name
 4 
 5 class Gift(object):
 6     def __init__(self,girl):
 7         self._target = girl
 8     def GiveChocolate(self):
 9         pass
10     def GiveFlower(self):
11         pass
12 
13 class Boy(Gift):
14     def __init__(self, name, girl):
15         self._name=name
16         super(Boy, self).__init__(girl)
17 
18     def GiveChocolate(self):
19         print ‘%s gives %s a chocolate‘ %(self._name,self._target._name)
20         
21     def GiveFlower(self):
22         print ‘%s gives %s a flower‘ %(self._name,self._target._name)
23 
24 class ChumProxy(Gift):
25     def __init__(self,boy):
26         self._boy = boy
27 
28     def GiveChocolate(self):
29         self._boy.GiveChocolate()
30     def GiveFlower(self):
31         self._boy.GiveFlower()    
32 
33 if __name__==‘__main__‘:
34     girl = Girl(‘girl‘)
35     boy = Boy(‘boy‘,girl)
36     chum = ChumProxy(boy)
37     chum.GiveChocolate()
38     chum.GiveFlower()