1 # -*- coding:utf-8 -*-
 2 # 登录三次错误锁定用户
 3 
 4 # 读取黑名单的用户,白名单的用户,白名单用户的密码
 5 with open('black_user.txt', 'r') as f,\
 6     open('real_username.txt', 'r') as u,\
 7     open('real_password.txt', 'r') as p:
 8     lock_file = f.read().strip()
 9     user_list = u.read()
10     pass_list = p.read()
11 
12 username = input('please input your name:')
13 
14 for i in range(1):
15     if lock_file == username:
16         print('Sorry, your name has been locked, please contact your administrator')
17         exit()
18     elif user_list != username:
19         print('you input username invalid.')
20         exit()
21 
22 # 用于计数(for循环三次的判断)
23 count = 0
24 for i2 in range(3):
25     password = input('please input your password:')
26     if password == pass_list:
27         print('login successfully')
28         exit()
29     else:
30         print('login failed')
31     count += 1
32 
33 if count == 3:
34     print("Your username has been locked, please you will contact your administrator.")
35     f = open('black_user.txt', 'a')
36     f.write('%s\n' % username)
37     f.close()