code: def multi_get(self, conn, *keys):
          
          values, _ = yield from self._multi_get(conn, *keys)
          return tuple(values.get(key) for key in keys)
docs: Takes a list of keys and returns a list of values.
  
          :param keys: ``list`` keys for the item being fetched.
          :return: ``list`` of values for the specified keys.
          :raises:``ValidationException``, ``ClientException``,
          and socket errors