Python 对象知识实践

#!/usr/bin/python# -*- coding: UTF-8 -*-class People(object):    hahaname = "abc"  # 公开静态名称    _hahaage = 1  # 保护静态名称    __hahasex = "难"  # 私有静态名称    # 构造函数    def __init__(self, name, age, sex):        # 定义实例变量        self.name = name  # 公开变量        self._sex = sex  # 保护变量        self.__age = age  # 私有变量    # 定义实例方法，第一个参数self    def sayHello(self):        print "sayHello"    # 定义类方法，第一个参数cls    @classmethod    def test1(cls):        print "classmethod"    # 参数可为空    @staticmethod    def test2():        print "staticmethod"    # 私有方法双下划线开头    def __test3(self):        print "__test3"    # 保护方法单下划线开头    def _test4(self):        print "_test4"    def __cmp__(self, other):        return cmp(self.name, other.name)    def __str__(self):        return "name:{},age:{},sex:{}".format(self.name, self.__age, self._sex)class Student(People):    def __init__(self, name, age, sex, student_id):        # 调用基类函数        super(Student, self).__init__(name, age, sex)        self.__student_id = student_id    def __str__(self):        return (super(Student, self).__str__() + ",student_id:{}").format(self.__student_id)if __name__ == '__main__':    peos = [People(name="whf", age=1, sex="男"),            People(name="oo", age=1, sex="男"),            Student(name="ada", age=1, sex="男", student_id="20136302")]    peos.sort()    for peo in peos:        print peo