作业

count = 0
while count < 3:
   user_name = input("请输入你的用户名:").strip()
   user_pwd = input("请输入你的密码:").strip()
   with open('a.txt', mode='rt', encoding='utf-8')as f:
      # 打开a.txt文件
      for line in f:
         # 读入到内存
         name, pwd = line.strip().split(":")
         # 解压赋值
         if user_name == name and user_pwd == pwd:
            # 用户输入比对文件
            print('登录成功')
            count = 4
            break
      else:
         print("账号密码错误,请重新输入.")
         count += 1