小编这次要给大家分享的是Python如何实现文件操作模拟用户登陆，文章内容丰富，感兴趣的小伙伴可以来了解一下，希望大家阅读完这篇文章之后能够有所收获。
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() 
