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class MyFilesPipeline(FilesPipeline):def get_media_requests(self, item, info):yield scrapy.Request(item['video_url'])def file_path(self, request, response=None, info=None, *, item=None):return item['video_name']def item_completed(self, results, item, info):file_paths = [x['path'] for ok, x in results if ok]if not file_paths:raise Exception('文件下载失败')return item">