1 # -*- coding: utf-8 -*-
2 # 基础需求
3 """
4 让用户输入用户名密码
5 认证成功后显示欢迎信息
6 输错三次退出程序
7 """
8 _username = "alice"
9 _password = "123"
10 count = 0
11
12 while count < 3:
13 username = input("Username:")
14 password = input("Password:")
15 if username == _username and password == _password:
16 print("登录成功！")
17 break
18 else:
19 print("登录失败！")
20 count += 1
1 # -*- coding: utf-8 -*-
2 # 升级需求
3 """
4 可以支持多个用户登录
5 用户3次认证失败后，退出程序，再次启动程序尝试登录时，是锁定状态
6 需把锁定状态存到文件中
7 """
8 import os
9 _listname = ['alice', 'alex', 'lily']
10 _password = "123"
11 count = 0
12 while count < 3:
13 if os.path.exists('lock_file.txt'):
14 f = open('lock_file.txt', 'r', encoding='utf-8')
15 if '3次' in f.read():
16 print('用户已锁定')
17 f.close()
18 break
19 username = input("Username:")
20 password = input("Password:")
21 if password == _password:
22 if not username in _listname:
23 print("登录失败！")
24 else:
25 print("登录成功！")
26 break
27 else:
28 print("登录失败！")
29 count += 1
30 else:
31 print('失败', '次数', '3次', sep='->', end='\n', file=open('lock_file.txt', 'w', encoding='utf-8'))
