urlparse.urlparse 将 URL 拆分为协议、位置、端口等，然后可以通过 拆分位置. 获取子域.

urlparse.urlparse will split the URL into protocol, location, port, etc. You can then split the location by . to get the subdomain.

url = urlparse.urlparse(address)
subdomain = url.hostname.split('.')[0]