day8.登陆注册简单实现

 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