版本一：登录之后自动识别身份
1 def login():
2 while 1:
3 name = input('请输入用户名：')
4 password = input('请输入密码：')
5 with open('校园成员信息.txt',encoding='utf-8') as info:
6 for line in info:
7 if line.strip().split(' ')[1] == name and line.strip().split(' ')[2] == password:
8 print('登录成功')
9 return '欢迎{}'.format(line.split(' ')[0])
10 break
11 if line.strip().split(' ')[1] != name:
12 print('用户名不存在,请重新输入')
13 continue
14 elif line.strip().split(' ')[2] != password:
15 print('密码输入错误,请重新输入')
16 continue
17 break
18 print(login())
版本二：先确定身份，再登录
1 def login():
2 ID_choise = input('''请选择你的身份
3 1. 管理员
4 2. 讲师
5 3. 学生
6 ''')
7 if ID_choise == '1':
8 open_file = '管理员信息.txt'
9 elif ID_choise == '2':
10 open_file = '讲师信息.txt'
11 elif ID_choise == '3':
12 open_file = '学生信息.txt'
13 else:
14 return '请选择正确的身份'
15 while 1:
16 name = input('请输入用户名：')
17 password = input('请输入密码：')
18 with open(open_file,encoding='utf-8') as info:
19 for line in info:
20 if line.strip().split(' ')[1] == name and line.strip().split(' ')[2] == password:
21 print('登录成功')
22 return '欢迎{}'.format(line.split(' ')[0])
23 break
24 if line.strip().split(' ')[1] != name:
25 print('用户名不存在,请重新输入')
26 continue
27 elif line.strip().split(' ')[2] != password:
28 print('密码输入错误,请重新输入')
29 continue
30 break
31 print(login())
