模拟数据，控制账号

# 要求二：定义用户类，定义属性db，执行obj.db可以拿到用户数据结构
class User:
    dbfile = 'user.db'
    def __init__(self,username):
        self.username = username
    @property    #定义一个操作数据的属性
    def db(self):
        with open (self.dbfile,encoding= 'utf-8') as f_read:
            for data_line  in f_read:
                data_line  = eval(data_line)  #将拿到的数据结果从str 转化成 dict
                return  data_line  #返回一个转化成功的dict
user1 = User('egon')
print (user1.db[user1.username])
print (user1.db[user1.username]["password"])  #通过用户名获取相应的密码

用户类：（操作对象)

import time
class User:
    db_path='user.db'
    def __init__(self,name):
        self.name=name
    @property
    def db(self): #设置db属性
        with open(self.db_path,'r') as read_file:
            info=read_file.read()
            return eval(info)  #调用db属性返回所有数据行
    @db.setter    #为属性db添加可修改功能
    def db(self,value):
        with open(self.db_path,'w') as write_file:
            write_file.write(str(value))
            write_file.flush()
    @property
    def locktime(self):
        result = self.db[self.name]['timeout'] - time.time()
        return result  #获取锁定时间

    @locktime.setter
    def locktime(self,value):
        pass
    def login(self):
        self.starttime = time.localtime(time.time()).tm_sec
        data=self.db
        t = time.localtime(time.time() - self.starttime)  #登录最后时间 - 一开始登录的时间= 用户在线时长
        if data[self.name]['status']:
            print('%s已经登录 在线时长是%02d:%02d:%02d'%(self.name,t.tm_hour,t.tm_min,t.tm_sec))
            return True
        if data[self.name]['timeout'] < time.time():
            count=0
            self.locktime = 100
            while count < 3:   #三次锁定
                passwd=input('password>>: ')
                if not passwd:continue
                if passwd == data[self.name]['password']:
                    data[self.name]['status']=True   #如果登录成功把相应状态值 修改成True
                    data[self.name]['timeout']=0      #登录成功，相应用户的timeout设置为0
                    self.db=data  #调用db.setter g更新数据
                    print("欢迎 %s 登录系统"%self.name)
                    break
                count+=1  #密码录入错，累计加-
            else:
                # data[self.name]['timeout']=time.time()+100
                data[self.name]['timeout'] =100 + time.time()  #100秒就退出自动锁定
                self.db=data
                self.starttime = time.localtime(time.time()-self.starttime)  #登录最后时间
        else:
            print('账号已经锁定%.2f秒'%self.locktime) #调用 locktime 属性
    def logout(self):
        data = self.db
        flag = True
        if data[self.name]['status']:
            while flag:
                # if time.time() - self.starttime > 30:
                anser = input("%s 是否要退出?"%self.name)
                if anser.lower() == "y":
                    data[self.name]['status'] =  False
                    print("%s 已经成功退出"% self.name)
                    # data[self.name]['timeout'] = 0
                    self.db = data
                    flag = False
                else:
                    break
        else:
            return False

u1=User('egon')

u1.login()

u2=User('alex')
u2.login()
u1.logout()
u2.logout()