用python知道URL地址提取链接中的域名与端口

import urllib  
    proto, rest = urllib.splittype("http://www.baidu.com/11/12.htm")  
    host, rest = urllib.splithost(rest)  
    print host  
    host, port = urllib.splitport(host)  
    if port is None:  
       port =80  
    print port