python之函数用法__setattr__

# -*- coding: utf-8 -*-
#python 27
#xiaodeng
#python之函数用法__setattr__
#http://www.cnblogs.com/hongfei/p/3858256.html



#用__setattr__函数重构方法
class Fruit():
    def __init__(self,color,price):
        self.__color = color
        self.__price = price
        
    def __setattr__(self,name,value):#重构方法__setattr__方法,没有该方法会默认存在该方法
        self.__dict__[name] = str('xiaodeng,')+str(value)  #为了看出区别，特意在__setattr__方法中加了str('xiaodeng')


if __name__ == "__main__":
    fruit = Fruit("blue", 10)
    print fruit                                 #__main__.Fruit instance
    print fruit.__dict__                        #{'_Fruit__price': 'xiaodeng,10', '_Fruit__color': 'xiaodeng,blue'}
    print fruit.__dict__.get("_Fruit__price")   #xiaodeng,10


    #给_Fruit__price设置新的属性
    fruit.__dict__["_Fruit__color"] = 'red'     
    print fruit.__dict__.get("_Fruit__color")   #red


    #增加新的属性和属性值
    fruit.__dict__['name']='xiaodeng'
    print fruit.__dict__                        #{'_Fruit__price': 'xiaodeng,10', 'name': 'xiaodeng', '_Fruit__color': 'red'}