# -*- coding: utf-8 -*- import os import glob import shutil def format_file_list(files):         all_files_str = ""         for i in range(len(files)):                 all_files_str +=  str(i)+":"+files[i]+"\n"         return all_files_str hosts_path = "C:\\Windows\\System32\\drivers\\etc" files =  os.listdir(hosts_path) os.chdir(hosts_path) if os.getcwd() != hosts_path:         print("Switch Dir to System32 Error,check permission!\npwd:"+os.getcwd())         exit() hosts_files = glob.glob("host*") choosed_file_idx = int(input("Choose Hosts File Index:\n"+format_file_list(hosts_files))) files_num = len(hosts_files) if (choosed_file_idx < 0 or choosed_file_idx >= files_num) :         print("Please choose a file in the lists!")         exit() print("Choosed idx:{0},file:{1}.".format(choosed_file_idx,hosts_files[choosed_file_idx])) shutil.copy("hosts","hosts.bak") shutil.copy(hosts_files[choosed_file_idx],"hosts") print("Copy ok,then flush dns...") os.system("ipconfig /flushdns")