Python_常见练习

 1 #!/usr/bin/env python3
 2 # _*_ coding:utf-8 _*_
 3 
 4 # 登录接口, 三次登录机会
 5 
 6 flag = 0
 7 
 8 user_data = {'username': '13564957378',
 9              'password': '123456'}
10 
11 while True:
12 
13     username = str(input('请输入账号：')).strip()
14     if username != str(user_data['username']):
15         print('输入的账号不存在')
16         continue
17 
18     # 读取lock.txt文件数据
19     lock_data = []
20     try:
21         with open('lock.txt', 'r') as f:
22             for line in f.readlines():
23                 lock_data.append(str(line).strip('
'))
24     except Exception:
25         print('文件读取失败')
26         raise
27 
28     while flag < 3:
29         # 判断输入账号是否被锁住
30         if username in lock_data:
31             print('您的账号已被锁住，请联系管理员')
32             break
33         else:
34             password = str(input('请输入密码')).strip('
')
35             if username == str(user_data['username']) and password == str(user_data['password']):
36                 print('{0} 登录成功!欢迎进入qc系统'.format(username))
37                 import sys
38                 sys.exit()
39             else:
40                 print('您还有{0}机会'.format(str(2-flag)))
41         flag += 1
42     else:
43         # 写入三次登录失败的账号进入lock文件
44         with open('lock.txt', 'w') as f:
45             f.writelines('{0}'.format(username)+'
')
46         break