### 前言 - 由于近期公司网络访问github特别不稳定，经常无法访问，然后就查找github的dns手动修改hosts，但是作为开发人员怎能每次手动修改，于是乎就写了python自动更新hosts脚本，废话不多说直接上代码。 ### 创建auto_update_hosts.py文件 - 新建类 AutoUpdateHosts，init函数添加获取更新的 ```python class AutoUpdateHosts(object): def __init__(self): self.new_hosts_url = 'Github项目521xueweihan/GitHub520获取' ``` - 新建is_admin，判断当前是否是管理员用户 ```python def is_admin(): ''' Check whether the user is an administrator. :return: ''' try: return ctypes.windll.shell32.IsUserAnAdmin() except: return False ``` - 新建get_default_contents，获取windows下hosts文件默认内容，可选添加自定义内容 ```python def get_default_contents(custom=''): ''' Obtain the default contents of the hosts file. :param custom: Custom content :return: ''' contents = f''' # Copyright (c) 1993-2009 Microsoft Corp. # # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. # # This file contains the mappings of IP addresses to host names. Each # entry should be kept on an individual line. The IP address should # be placed in the first column followed by the corresponding host name. # The IP address and the host name should be separated by at least one # space. # # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # 102.54.94.97 rhino.acme.com # source server # 38.25.63.10 x.acme.com # x client host # localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost ''' if custom != '': contents += f''' # Customizing content start {custom.strip()} # Customizing content stop ''' return contents.replace(' ', '').strip() ``` - 新建get_new_contests，获取新的hosts内容 ```python def get_new_contents(self): ''' Obtain the contents of the new hosts file :return: ''' resp = requests.get(self.new_hosts_url) return resp.text ``` - 新建save_hosts_contents，存储最终的hosts文件内容 ```python def save_hosts_contents(self, custom=''): ''' Stores the final hosts file contents. :param custom: Custom content :return: ''' now_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(round(time.time() * 1000) / 1000)) hosts_contents = f'{self.get_default_contents(custom=custom)}\n\n# Updated at {now_time}\n{self.get_new_contents()}' admin = self.is_admin() if admin: with open('C:\\Windows\\System32\\drivers\\etc\\hosts', 'w+') as fp: fp.write(hosts_contents) dnsFlush = "ipconfig /flushdns" os.system(dnsFlush) print("github DNS刷新成功") time.sleep(3) else: # Re-run the program with admin rights ctypes.windll.shell32.ShellExecuteW( None, "runas", sys.executable, __file__, None, 1) ``` - 效果图  ### 创建定时任务 - 由于windows下无crontab，需使用`任务计划程序`来定时执行脚本。 - 创建定时任务过程不在演示，可自行搜索即可。 ### 结语 - 因办公电脑是windows所以本脚本暂时只支持在windows下使用。 - 本教程有使用`521xueweihan/GitHub520`的开源项目，在此特别感谢。 - 以上就是自动刷新hosts文件的全部代码，希望能帮助一些小伙伴。 - 如果在类Unix运行本脚本代码则需稍做修改，如操作有问题欢迎去[我的博客(www.loganjin.cn)](https://www.loganjin.cn/)留言或者微信公众号([Python技术交流圈](https://img-blog.csdnimg.cn/img_convert/09f3ccbb0f9231855f20b0f5fca7da16.png#pic_center))留言交流哦。