Python scrapy中*作用是什么，怎么使用，pythonscrapy,pythonfrom s

Python scrapy中*作用是什么，怎么使用，pythonscrapy,pythonfrom s

pythonfrom scrapy.exceptions import DropItemclass PricePipeline(object):    vat_factor = 1.15    def process_item(self, item, spider):        if item['price']:            if item['price_excludes_vat']:                item['price'] = item['price'] * self.vat_factor            return item        else:            raise DropItem("Missing price in %s" % item)

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