python学习八（私有属性、__del__(self)方法）

1、保护属性，私有属性

#encoding=utf-8#保护属性，定义属性时，以两个下划线开始__class Person:    def __init__(self, name, age):        self.__name = name        self.__age = age#私有属性        self.sex = 1#公有属性    def __str__(self):        msg = "姓名为%s，年龄为%d"%(self.__name, self.__age)        return msg    def setAge(self, newAge):        self.__age = newAgexiaoming = Person("xiaoming", 18)print xiaoming#现在这个赋值,没有意义#xiaoming.__age = 19xiaoming.setAge(19)print xiaoming

2、__del__(self)方法

#encoding=utf-8class Dog:    #初始化方法-----构造方法    def __init__(self, name):        print('初始化'+name)        self.name = name    #回收对象，-------析构方法    def __del__(self):        print('回收对象%s'%self.name)dog = Dog('旺财')print '--------------------1--------------------'dog1 = dogprint id(dog)print id(dog1)del dogdel dog1print '--------------------2--------------------'