How to use the ruia.item.Item function in ruia

):
        try:
            async for callback_result in callback_results:
                if isinstance(callback_result, AsyncGeneratorType):
                    await self._process_async_callback(callback_result)
                elif isinstance(callback_result, Request):
                    self.request_queue.put_nowait(
                        self.handle_request(request=callback_result)
                    )
                elif isinstance(callback_result, typing.Coroutine):
                    self.request_queue.put_nowait(
                        self.handle_callback(
                            aws_callback=callback_result, response=response
                        )
                    )
                elif isinstance(callback_result, Item):
                    # Process target item
                    await self.process_item(callback_result)
                else:
                    await self.process_callback_result(callback_result=callback_result)
        except Exception as e:
            self.logger.error(e)

async def _process_async_callback(self, callback_results: AsyncGeneratorType, response: Response = None):
        try:
            async for callback_result in callback_results:
                if isinstance(callback_result, AsyncGeneratorType):
                    await self._process_async_callback(callback_result)
                elif isinstance(callback_result, Request):
                    self.request_queue.put_nowait(self.handle_request(request=callback_result))
                elif isinstance(callback_result, typing.Coroutine):
                    self.request_queue.put_nowait(self.handle_callback(aws_callback=callback_result, response=response))
                elif isinstance(callback_result, Item):
                    # Process target item
                    await self.process_item(callback_result)
                else:
                    await self.process_callback_result(callback_result=callback_result)
        except Exception as e:
            print(333)
            self.logger.error(e)