username = input('请输入注册的用户名：')

     password = input('请输入注册名的密码：')

     with open('list_of_info',mode='w',encoding= 'utf-8') as f:

         f.write('{}\n{}'.format(username,password))

     print('注册成功')

     lis = []

     i = 0

     while i < 3:

         usn = input('请输入用户名：')

         pwd = input('请输入密码：')

         with open('list_of_info', mode='r+', encoding='utf-8') as f1:

             for line in f1:

                 lis.append(line.strip())

         if usn == lis[0] and pwd == lis[1]:

             print('登陆成功')

             break

         else:

             print('账号密码错误')

         i = i + 1