时间:2020-06-25 python教程 查看: 1212
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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