解决谷歌搜索技术文章时打不开网页问题的python脚本

注意：Win7或者WIn8用户要用管理员权限执行。

项目地址：http://code.google.com/p/my-hosts-file/downloads

import urllib  
    import os  
    import shutil      hostspath = "C:\\Windows\\System32\\drivers\\etc"  
    savepath = hostspath + "\\hostsave"  
    def download_hosts(url = "http://my-hosts-file.googlecode.com/svn/trunk/hosts"):  
        os.chdir(hostspath)  
        if os.getcwd() != hostspath:  
            print("Switch Dir to System32 Error,check permission!\npwd:"+os.getcwd())  
            exit()   
        try:  
            urllib.urlretrieve(url, "hostsave")  
        except:  
            print '\t Error when retrieveing hosts file from url: ', url  
    def backup_hosts():  
        shutil.copy("hosts","hosts.bak")  
    def replace_hosts():  
        shutil.copy("hostsave", "hosts")  
        print("Replace original hosts file finished, then flush dns...")  
        os.remove(savepath)      
        os.system("ipconfig /flushdns")  
    def main():  
        download_hosts()  
        backup_hosts()  
        replace_hosts()  
    if __name__ == '__main__':  
        main()