    def schema(self) -> List[str]:
        """
        Return the schema of the DataQueue.

        Examples:
            >>> from towhee.runtime.data_queue import DataQueue, ColumnType
            >>> dq = DataQueue([('a', ColumnType.SCALAR), ('b', ColumnType.QUEUE)])
            >>> dq.put(('a', 'b1'))
            True
            >>> dq.schema
            ['a', 'b']
        """
        return self._schema.col_names
Return the schema of the DataQueue.

Examples:
>>> from towhee.runtime.data_queue import DataQueue, ColumnType
>>> dq = DataQueue([('a', ColumnType.SCALAR), ('b', ColumnType.QUEUE)])
>>> dq.put(('a', 'b1'))
True
>>> dq.schema
['a', 'b']
towhee/runtime/data_queue.py