python url 解析

#_*_ coding:utf-8 _*_from urlparse import urlparseurl_str = "http://www.163.com/mail/index.htm"url = urlparse(url_str)print 'protocol:',url.schemeprint 'hostname:',url.hostnameprint 'port:',url.portprint 'path:',url.pathi = len(url.path) - 1while i > 0:    if url.path[i] == '/':        break    i = i - 1print 'filename:',url.path[i+1:len(url.path)]