python---依葫芦画瓢之登录验证

#! /usr/bin/env python
#coding=utf-8

#定义登录认证函数

def login():
    flag = False
    #当返回False的地方比较多的时候可以定义初始值为false，这样就可以在用的用的True的时候，再赋值为True
    #做返回值用，返回True的时候代表登录成功
    users = []
    passwds = []
    trytimes = []
    #读取用户资料文件
    with open("account.txt",'r') as f_account:
        lines = f_account.readlines()
        for line in lines:
            account,password,trytime = line.strip().split()
            users.append(account)
            passwds.append(password)
            trytimes.append(trytime)
    #获取用户输入的用户名和密码
    username = raw_input("Please entry username:")
    password = raw_input("Please entry user password:")
    if username not in users:
        #从用户列表中查找用户
        print "The useraccount is not finded"
    elif int(trytimes[users.index(username)]) >= 3:
        #判断用户是否为锁定
        #print type(trytimes[users.index(username)])
        print "The user is locked"
    elif passwds[users.index(username)] != password:
        #判断密码是否正确
        print "The useraccount or the password is error"
        #密码错误，登录次数加1，并写入文件
        trytimes[users.index(username)] = int(trytimes[users.index(username)]) + 1
        with open("account.txt", 'w+') as f_account:
            for i in range(len(users)):
                f_account.write(users[i] + ' ' + passwds[i] + ' ' + str(trytimes[i]) + '\n')
    else:
        print "Welcome to Login"
        flag = True
    return flag


def auth():
    while True:
        flag = login()
        if flag is True:
            break

if __name__ == '__main__':
    auth()