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如何在类中定义一个私有变量呢，我们不希望类里的变量随意被外界访问，python中没有private，只需要在变量前面加上两个下划线就可以了

#coding=utf-8'''Created on 2016-3-18@author: Administrator'''class PersonDemo():    def __init__(self):        self.__name=''        self.__age = 0pd = PersonDemo()print pd.__age      #这条语句会出错

#coding=utf-8'''Created on 2016-3-18@author: Administrator'''class PersonDemo():    def __init__(self):        self.__name=''        self.__age = 0    def get_name(self):        return self.__name    def set_name(self,value):        self.__name = valuepd = PersonDemo()pd.set_name('kwsy')print pd.get_name()

#coding=utf-8'''Created on 2016-3-18@author: Administrator'''class Person():    name = property()    age = property()    def __init__(self):        self.__name = ''        self.__age = ''    @name.getter    def name(self):        return self.__name        @name.setter    def name(self,value):        self.__name = value            @age.getter    def age(self):        return self.__age        @age.setter    def age(self,value):        self.__age = value        p = Person()p.age = 30p.name = 'kwsy'print p.nameprint p.age

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