code: def port_uris_prop(self):
          
          if self._port_uris_prop is None:
              family = self.get_property('adapter-family')
              try:
                  self._port_uris_prop = self.port_uris_prop_by_family[family]
              except KeyError:
                  self._port_uris_prop = ''
          return self._port_uris_prop
docs: :term:`string`: Name of adapter property that specifies the adapter
          port URIs, or the empty string ('') for adapters without ports.
  
          For example, 'network-port-uris' for a network adapter.