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本文采用的文本在代碼中已詳細注釋，流程圖如下：
代碼如下：

#!/usr/bin/env python # Author:Zhu dongdong import os import sys #the article use file : ''' username_Password.txt: aaa 111 bbb 222 ccc 333 ddd 444 lock_username.txt: aaa ddd ''' user_name = "" password = "" count = 0#the count is used for cycle(while) count1 = 0#the count1 is used for judging #check username is lock or not def check_username_isLock():with open(r"E:/lock_username.txt")as file2:locklist = file2.readlines()for lock_name in locklist:username = lock_name.strip("\n")if username == user_name :print("the operation is too frequently")exit()return #return 1 represent that username is exist and return 0 against def check_username_isExist():x = 0with open(r"E:/userName_Password.txt")as file1:list = file1.readlines()for List_user_andName in list:(user, password1) = List_user_andName.strip("\n").split(" ")if user_name == user:x = 1return x #check the password is right def check_password_isok(count1):with open(r'E:/username_Password.txt')as file:list = file.readlines()for user in list:(username,passsword1) = user.strip("\n").split(" ")if user_name == username and password == passsword1:print("Welcome to login...")exit()elif user_name == username and password != passsword1:count1 = count1 + 1print("The input of password is error!")return count1 #write the username to 'lockfile' def write_lockusername():file = open("E:lock_username.txt", "a")file.write('''\n{a}'''.format(a = user_name))return while count == 0:user_name = input("please input the username:")check_username_isLock()ret = check_username_isExist()if ret == 1:#represent username is existpassword = input("Please input the password:")breakelse :print("The username is error,Please try again.") while count == 0:count1 = check_password_isok(count1)if count1 == 3:write_lockusername()exit(0)password = input("Please input the password:")

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