Python 用户登录练习

#!/usr/bin/env python
#_*_ coding:utf-8 _*_
import os 
import sys
count=3
retry_count=0
account_file='/home/hello/login.txt'
lock_file='/home/hello/lock.txt'
while retry_count < count:
    username=raw_input('input the username: ')
    lock_check=file(lock_file)
    for line in lock_check.readlines():
line=line.split()
        if username == line[0]:
   sys.exit('user is locked')
#            print '%s is locked',username
#            break
    password=raw_input('input the password: ')
    f=file(account_file,'rb')
    match_flag=False
    for line in f.readlines():
        user,passwd=line.strip('\n').split(':')
        if username == user and password == passwd:
            print 'login successful'
            match_flag=True
            break
    f.close()
    if match_flag == True:
print 'enjoy your system'
        break
    elif match_flag == False:
        print 'User is not matched'
        retry_count +=1
#    else:
#        print 'enjoy your system'
else:
    print 'your account is locked'
    f = file(lock_file,'ab')
    f.write(username)
    f.close()
           
note:登录系统，输入用户名和密码，如果三次登录失败的话，将用户进行锁定