#!/usr/bin/env python# -*- coding:utf-8 -*-# Author:Huanglinsheng#输入用户名密码，认证成功后显示欢迎信息，输错三次后锁定file = open('lock.txt').readlines()name = input('username:').strip()lock=[]for i in file:     line = i.strip('\n')     lock.append(line)if name in lock:     print(name,'已经被锁定,请联系开户行.退出!')else:     i = 1     while i <=3:            i = i + 1            print('........................')            username = name            print (username)            passwd = input('Passwd:').strip()            f = open('user.txt', 'r')            login = False            if len(username) != 0 and len(passwd) != 0:                  for line in f.readlines():                        if username == line.split()[0] and passwd == line.split()[1] :                              print("欢迎中国银行AMT系统")                              login = True                              break                        else:                              continue            if login is True:                              break     else:            f = open('lock.txt', 'a')            f.write(name)            f.write('\n')            f.close()            print(name,'你的密码输入超过三,锁定帐号,退出')