python一个简单的登录

文件目录下有两个文件

user_name.txt

lock_file.txt

实际中可以读数据库里的信息

代码如下

 #encoding = utf-8
 import sys

 user_file = 'user_name.txt'
 lock_file = 'lock_file.txt'

 retry_count = 0
 retry_limit = 3

 while retry_count < retry_limit:
     username = raw_input('\033[32;1mUsername:\033[0m')
     lock_check = file(lock_file)
     for line in lock_check.readlines():
　　　　　　 line = line.split()
         if username == line[0]:
         sys.exit('%s is locked' % username)

     passwd = raw_input('\033[32;1mPassword:\033[0m')

     f = file(user_file,'rb')
     match_flag = False
     for line in f.readlines():
     　　 user,password = line.strip('\n').split()
         if username == user and passwd == password:
         match_flag = True
         break
     f.close()
     if match_flag == False:
     　　 print 'User unmatched'
         retry_count += 1
     else:
     　　print 'Welcome login Learning python'
     　　sys.exit(0)
 else:
     print 'Your account is lock'
     f = file(lock_file,'ab')
     f.write(username+'\n')
     f.close()