题目要求

1、输入用户名和密码后回车

2、密码输入错误，给出提示，并选择是否重新输入

3、密码输入错误三次后，用户被锁定，无法继续登陆

构思

1、用户输入账号和密码后，需要判断账号是否存在

2、判断账号是否被禁用（错误次数大于三次）

3、判断账号密码是否正确

4、不同的错误给出不同的提示

5、每输入错一次，文档中的错误次数需要更新

6、如果三次以内用户登陆成功，密码原来的错误次数被重置

题目完成步骤

1、文档的编写

考虑到数据的存储问题，决定将账号、密码、错误次数进行分行存储，三行为一组用户信息

2、代码编写

go = True
while go:
  # 用来判断账号是否存在
  no_existence_flag = True
  # 用来判断是否输入正确
  no_flag = True
  # 用来判断是否已经被封
  disable_flag = True
  # 用来判断次数是否已经超过限制
  account = input("account:")
  password = input("password:")
  # 判断账号是否存在（自己写入已存在用户的账号密码）
  file = open("C:/Users/Lenovo/Desktop/user.txt","r")
  # 用于拼接文本内容
  file_data = ""
  while True:
    line = file.readline()
    if not line:
      break
    file_data += line
    line_content = line.strip()
    # 判断是否存在账号
    if account == line_content:
      no_existence_flag = False
      true_password = file.readline()
      file_data += true_password
      true_password_content = true_password.strip()
      disable_flag_line = file.readline()
      disable_flag_num = int(disable_flag_line.strip())
      # 判断账号是否被禁用
      if disable_flag_num != 3:
        print("It is not disable！",disable_flag_num)
        disable_flag = False
        # 判断密码是否正确
        if password == true_password_content:
          no_flag = False
          print("Welcome in this system,{account}!".format(account = account))
          go = False
          disable_flag_line = disable_flag_line.replace(str(disable_flag_num),str(0))
          file_data += disable_flag_line
        else:
          disable_flag_line = disable_flag_line.replace(str(disable_flag_num),str(disable_flag_num+1))
          file_data += disable_flag_line
      else:
        file_data += file.readline()
    else:
      file_data += file.readline()
      file_data += file.readline()
  file.close()
  # 账号不存在的报错
  if no_existence_flag:
    print("This account is not existence！")
    print("Do you want to try it again......")
    flag = input("Please input you think：")
    if flag == "N":
      go = False
    continue
  # 账号被禁用的报错
  if disable_flag:
    print("You account is disable,please go home by youself!")
    print("Do you want to try it again......")
    flag = input("Please input you think：")
    if flag == "N":
      go = False
    continue
  # 账号密码错误的报错
  if no_flag:
    file = open("C:/Users/Lenovo/Desktop/user.txt","w")
    print(file_data)
    file.write(file_data)
    file.close()
    print("Your password is not right，please try it again!")
    print("Do you want to try it again......")
    flag = input("Please input you think：")
    if flag == "N":
      go = False
  # 重置输入次数
  else:
    file = open("C:/Users/Lenovo/Desktop/user.txt","w")
    print(file_data)
    file.write(file_data)
    file.close()

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