python学习 登陆验证

#!/usr/bin/env python
#-*- coding=utf-8 -*-
#----------------导入模块------------------------------
import os
import sys

#----------------设置账户密码------------------------------
user_name = ['root', 'hyg', 'None']
user_passwd = ['123qwe', '123123', 'None']
file_list = '/home/hyg/py/file/user_db.txt'
#----------------登陆验证------------------------------
def user_login ():
  i = 0
  def passwd_login ():
    while True:
      global NAME_INPUT
      NAME_INPUT = raw_input("请输入您的用户名：").strip()
      if len(NAME_INPUT) == 0:
        print "用户名不能为空!"
        continue 
      else:
        break
    return

  passwd_login()

  while True:
    if i < 3:
      passwd_input = raw_input("请输入您的密码：")
      if len(passwd_input) == 0:
        print "密码不能为空！"
        continue

      elif NAME_INPUT not in user_name:
        print("您输入的密码有误，请您重新输入！")
        i += 1
        continue

      else:
        if passwd_input == user_passwd[user_name.index(NAME_INPUT)]:
          print("您好%s,欢迎登陆员工信息查询系统！") % NAME_INPUT
          break
        else:
          print("密码有误，请重新输入您的密码")
          i += 1
          continue
        break
      break
    else:
      print "您的密码输错3次请您重新核对账号和密码！"
      i = 0
      passwd_login()
      continue
user_login()
print("OK")