def process_item(self, item, spider):
        if item['origin'] in self.ids_seen:
            raise DropItem(item % "Duplicate item found: %s")
        else:
            self.ids_seen.add(item['origin'])
            return item
dataset/ETHPy150Open johncadigan/scrapy-sci/wallpaper_demo/wallpaper/duplicate_pipeline.py/DuplicatesPipeline.process_item/swapped operands of `%`