Method start

scrapy/core/engine.py:164–174

(
        self, _start_request_processing: bool = True
    )

        return scheduler_cls

    def start(
        self, _start_request_processing: bool = True
    ) -> Deferred[None]:  # pragma: no cover
        warnings.warn(
            "ExecutionEngine.start() is deprecated, use start_async() instead",
            ScrapyDeprecationWarning,
            stacklevel=2,
        )
        return deferred_from_coro(
            self.start_async(_start_request_processing=_start_request_processing)
        )

    async def start_async(self, *, _start_request_processing: bool = True) -> None:
        """Start the execution engine.