python 3.5 用户登录验证和输入三次密码锁定用户

 #!/usr/bin/env python
 #encoding: utf-8
 #登录程序，输入用户和密码输出欢迎信息，输入错误三次锁定用户，不让登录
 import sys
 print  ('''
         欢迎登陆我们的系统
 ''')

 pass_file = open('passwd.txt','r')
 clok_file = open('clok.txt','r')

 name_list = []
 clok_list = []
 name_dict = {}
 for i in pass_file:
     name, passwd = i.strip('\n').split(':')
     name_list.append(name)
     name_dict[name] = passwd
 pass_file.close()
 for i in clok_file:
     clok_list.append(i.strip('\n'))
 clok_file.close()
 #print (clok_list)

 num = 1
 name = input('please input your name:')
 if name in clok_list:
     print ('your name is clok ,peasle system admin')
     sys.exit()
 if name in name_dict:
     while num <=3:
         passwd = input('please input your passwd:')
         if passwd == name_dict[name]:
             print ('welcome to wo system')
             break
         else:
             print ('pass error')
             num += 1
 else:
     print ('user no system')

 if num > 3:
     print ('your name is clok ,peasle system admin')
     f = open('clok.txt','a')
     f.write(name +'\n')
     f.close()

passwd.txt 文件按格式

用户名：密码

用户名2：密码

clok.txt 文件格式

用户名1

用户名2