code: def value(self, kind, device):
          
          self._log.debug(_('{0}(match={1!r}, {2}={3!r}) used for {4}',
                            self.__class__.__name__,
                            self._match,
                            kind, self._values[kind],
                            device.object_path))
          return self._values[kind]
docs: Get the value for the device object associated with this filter.
  
          If :meth:`match` is False for the device, the return value of this
          method is undefined.