code: def get(self, conn, key, default=None):
          
          values, _ = yield from self._multi_get(conn, key)
          return values.get(key, default)
docs: Gets a single value from the server.
  
          :param key: ``bytes``, is the key for the item being fetched
          :param default: default value if there is no value.
          :return: ``bytes``, is the data for this specified key.