signals.py 文件源码

python
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项目:scrapy_project 作者: zhanghe06 项目源码 文件源码
def from_crawler(cls, crawler):
        pipeline = cls()
        crawler.signals.connect(pipeline.engine_started, signals.engine_started)  # ????
        crawler.signals.connect(pipeline.engine_stopped, signals.engine_stopped)  # ????
        crawler.signals.connect(pipeline.item_scraped, signals.item_scraped)  # ??????????
        crawler.signals.connect(pipeline.item_dropped, signals.item_dropped)  # ??????????
        crawler.signals.connect(pipeline.spider_opened, signals.spider_opened)  # ????????????
        crawler.signals.connect(pipeline.spider_closed, signals.spider_closed)  # ????????????
        crawler.signals.connect(pipeline.spider_idle, signals.spider_idle)      # ????
        crawler.signals.connect(pipeline.spider_error, signals.spider_error)    # ????
        crawler.signals.connect(pipeline.request_scheduled, signals.request_scheduled)    # ??????
        crawler.signals.connect(pipeline.request_dropped, signals.request_dropped)    # ??????
        crawler.signals.connect(pipeline.response_received, signals.response_received)    # ????
        crawler.signals.connect(pipeline.response_downloaded, signals.response_downloaded)    # ????
        return pipeline
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