import subprocessimport base64thunder_path = 'E:\Thunder\Program\Thunder.exe'def Url2Thunder(url):    url = 'AA' + url + 'ZZ'    url = base64.b64encode(url.encode('ascii'))    url = b'thunder://' + url    thunder_url = url.decode()    return thunder_urldef download_with_thunder(file_url):    thunder_url = Url2Thunder(file_url)    subprocess.call([thunder_path, thunder_url])