Outer or inner link url

I want to know if a href="url" attribute is an outer or inner URL. How can I do it in django. Please help. May be like this

if URL.find("www.s开发者_高级运维ameurl.com") == -1 and URL.find("sameurl.com")==-1:
   do
else:
   do

MY_DOMAIN = "sameurl.com"

import urlparse
parsed = urlparse.urlparse(url)
if parsed.netloc=='' or parsed.netloc.endswith(MY_DOMAIN):
    # internal
else:
    # external