python 类的重载

#!/usr/bin/python
#_*_coding:utf8_*_
class money():
    def __init__(self,currency,value,accuracy):
        self.currency=currency
        self.value=value
        self.accuracy=accuracy
    def __add__(self,other):
        return money(self.currency,self.value+other.value,self.accuracy)
    def __sub__(self,other):
        return money(self.currency,self.value-other.value,self.accuracy)
    def __rmul__(self,other):
        return money(self.currency,self.value*other.value,self.accuracy)
#    def __rmul__(self,other):
#        return self.value*other
rmbAccuracy=["元","角","分"]
rmb1=money("rmb",20,rmbAccuracy)
rmb2=money("rmb",50,rmbAccuracy)
accRmb = rmb1 + rmb2
subRmb = rmb1 - rmb2
print "重载和为："+str(accRmb.value)+"重载之差:"+str(subRmb.value)
mulRmb = rmb1 * rmb2 * rmb1
print "类的重载乘积为："+str(mulRmb.value)
#mulIntRmb = rmb1 *28
#print "类与整数的乘积为" +str(mulIntRmb)