python实现用户登录界面

#!/use/bin/env python
#-*- coding:utf-8 -*-

import sys,os
import getpass
#os.system(‘clear‘)

i = 0

while i < 3:
    name = input("请输入用户名：")

    lock_file = open(‘account_lock‘,‘r+‘)
    lock_list = lock_file.readlines()

    for lock_line in lock_list:
         lock_line = lock_line.strip(‘\n‘)
         if name == lock_line:
             sys.exit(‘用户 %s 已经被锁定，退出‘ % (name))

    user_file = open(‘account‘,‘r‘)
    user_list = user_file.readlines()

    for user_line in user_list:
         (user,password) = user_line.strip(‘\n‘).split( )

         if name == user:
             j = 0
             while j < 3:
                  #passwd = getpass.getpass(‘请输入密码：‘)
                  passwd = input(‘请输入密码：‘)
                  if passwd == password:
                       print("用户%s登录成功" % name)
                       sys.exit(0)
                  else:
                       if j != 2:
                            print("用户 %s 密码错误，请重新输入，还有 %d 次机会" % (name,3 - j ))
                  j += 1
             else:
                  lock_file.write(name + ‘\n‘)
                  sys.exit(‘用户 %s 达到最大登录次数，将被锁定并退出‘ % name)
         else:
              pass
    else:
        if i != 2:
             print(‘用户名%s 不存在，请重新输入，还有 %d 次机会‘ % (name,3 - i))
    i += 1
else:
     sys.exit("用户 %s 不存在,退出" % name)

lock_file.close()
user_file.close()