python 初学习 模拟用户登录

#！/usr/bin/env python
#coding:utf-8
'''
    2017年8月19日
　　python 模拟用户登录，连续失败次数超过3次永辉名被锁定
    userfile 文件保存字典 用户名，和密码
    sorryname 文件保存字典 登录过的的用户名，登录成功，值为0，登录失败，值+1
    当值大于等于3是，账号被锁定，无法进行登录
'''
import shelve
# 私有属性，保存文件名
__userfile = 'loginname.dat'
__users = 'users'
__sorryname = 'sorrylogin.dat'
__sorry = 'sorryuser'
#登录功能
def login(name,passwd):
    userfile = shelve.open(__userfile)
    users = userfile[__users]
    sorryname = shelve.open(__sorryname)
    sorry = sorryname[__sorry]
    try:
        if name in users:
            #登录成功
            if passwd == users[name]:
                sorry[name]=0
                return '登录成功'
            else:   # 失败
                if name in sorry:
                    sorry[name]=sorry[name]+1
                else:
                    sorry[name]=1
                return '密码错误'
        else:
            return '没有此用户，请注册'
    finally:
        sorryname[__sorry]=sorry
        sorryname.close()
if __name__ == "__main__":　　　　
    #userfile = shelve.open('loginname.dat')
    #users = {'fuzhentao':'123456','zhangsan':'456789','lisi':'147852'}
    #userfile[__users]=users
    #userfile.close()
    '''sorryname = shelve.open(__sorryname)
    sorryuser={}
    sorryname[__sorry]=sorryuser
    sorryname.close()'''
    while True:
        sorryname = shelve.open(__sorryname)
        sorry = sorryname[__sorry]
        name = input('请输入用户名：')
        passwd = input('请输入密码：')
        if name in sorry and sorry[name]>=3:
            print("账号被锁定")
        else:
            print(login(name,passwd))