code: def port_uri_segment(self):
          
          if self._port_uri_segment is None:
              family = self.get_property('adapter-family')
              try:
                  self._port_uri_segment = self.port_uri_segment_by_family[
                      family]
              except KeyError:
                  self._port_uri_segment = ''
          return self._port_uri_segment
docs: :term:`string`: Adapter type specific URI segment for adapter port
          URIs, or the empty string ('') for adapters without ports.
  
          For example, 'network-ports' for a network adapter.