code: def parse_discovery_service_response(url="", query="",
              returnIDParam="entityID"):
          
  
          if url:
              part = urlparse(url)
              qsd = parse_qs(part[4])
          elif query:
              qsd = parse_qs(query)
          else:
              qsd = {}
  
          try:
              return qsd[returnIDParam][0]
          except KeyError:
              return ""
docs: Deal with the response url from a Discovery Service
  
          :param url: the url the user was redirected back to or
          :param query: just the query part of the URL.
          :param returnIDParam: This is where the identifier of the IdP is
              place if it was specified in the query. Default is 'entityID'
          :return: The IdP identifier or "" if none was given