23种设计模式之python实现--Flyweight模式

#理解
#运用共享技术，减少大量细粒度对象对存储的开销
#例子
#我们知道我们现在网上会注册很多帐号和密码，一些不重要的都是相同的，这样如果很多很多的话就会占用大量的空间
#Flyweight
class Flyweight:
def Operation(self):
pass
#ConcreateFlyweight
class password(Flyweight):
def __init__(self,pwd):
self.pwd=pwd
def Operation(self):
pass
#FlyweightFactory
class FlyweightFactory:
object={}
i=0
def getFlyweight(self,pwd):
for ii in range(0,self.i):
if self.object[ii].pwd==pwd:
return self.object[ii]
self.object[self.i]=password(pwd)
self.i=self.i+1
return self.object[self.i-1]
#client
if __name__=='__main__':
fc=FlyweightFactory()
fw=fc.getFlyweight("123")
fw1=fc.getFlyweight("345")
fw2=fc.getFlyweight("123")
print fw,fw.pwd
print fw1,fw1.pwd
print fw2,fw2.pwd