1. class Person:     def __init__(self,sex=None):         self.sex=sex     def eat(self):         print("正在吃饭...")     def sleep(self):         print("正在睡觉...")     def say(self):         print("我的姓名：%s,我的年龄：%d"%(self.name,self.age)) p=Person() p.eat() p.sleep() #添加对象属性，只属于当前对象 p.name='zhangsan' p.age=21 #print("姓名：%s,年龄：%d"%(p.name,p.age)) p.say() lisi=Person() lisi.name="lisi" lisi.age=11 lisi.say() 2.

class Student(object):     name=None     age=None     sex=None     def __init__(self,name=None,age=None,sex=None):         print("init...")         self.name=name         self.age=age         self.sex=sex     def study(self):         print("{0}在学习".format(self.name))     def __siyou(self):         print("siyou")     def __str__(self):         self.__siyou()         return "姓名:{0},年龄：{1},性别：{2}".format(self.name,self.age,self.sex)     def __del__(self):         print("对象正在销毁...") s=Student('张三') del s input()