博客地址：http://www.cnblogs.com/wanghui1991

执行方式：Linux平台下安装好python3.x以上版本

               chmod +x login.py

               ./login.py

数据：account.db村烦的事锁定的账户信息

#!/usr/bin/env python

# -*- coding:utf-8 -*-

#Author:wanghui

import os,sys,getpass

#定义变量

lock_file = 'lock.db'              #锁定用户信息

account_file = 'account.db'        #正确用户信息

counter = 0   #初始化计数器

while counter < 3:

    username = input('please input your name:').strip()

    lock_check = open(lock_file,'r+')

    account_check = open(account_file,'r+')

    for u_line in lock_check.readline():

        u_line = u_line.strip('\n')

        if username == u_line:

            sys.exit("%s is locked!!" %username)

    password = getpass.getpass('please input your password:')

    for p_line in account_check.readlines():

        user,passwd = p_line.strip('\n').split()

        if username == user and password == passwd:

            sys.exit('user %s ,welcome to login!!'%username)

        elif username != user:

            sys.exit('username incorrect!!')

        elif username == user and password != passwd:

            print('retry again!!')

            counter += 1

        account_check.close()

else:

    print('user %s is locked!!'%username)

    lock_now = open(lock_file,'a')

    lock_now.write(username)

    lock_now.write('\n')

    lock_now.close()