1 #!/usr/bin/env python
 2 # *_* coding:utf-8 *_*
 3 # python learning, keep on!
 4 count=0
 5 while count <3:
 6     username = input(‘username:‘)
 7     password = input(‘password:‘)
 8     userlock=[]
 9     for i in open(‘lockuser.txt‘,‘r‘):
10         userlock.append(i.strip(‘\n‘))
11     if username in userlock:
12         print(‘your username has locked! please contact administrator.‘)
13         break
14     else:
15         user=[]
16         for j in open(‘user.txt‘,‘r‘):
17             user.append(j.strip(‘\n‘))
18         up=username+‘:‘+password
19         if up in user:
20             print(‘wellcome ‘+username+‘ login!!‘)
21             break
22         else:
23             count+=1
24             print(‘Invalid username or password, your try ‘+str(count)+‘ times‘)
25 else:
26     print(‘too many time you try ,we locking your username.‘)
27     usertolock=open(‘lockuser.txt‘,‘a‘)
28     usertolock.write(username+‘\n‘)
29     usertolock.close()