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 = Truewhile 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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