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'}