Scrapy不同的item指定不同的Pipeline

scrapy不同的item指定不同的Pipeline

from items import AspiderItem, BspiderItem, CspiderItem

class myspiderPipeline(object):
    def __init__(self):
        pass

    def process_item(self, item, spider):
        if isinstance(item, AspiderItem):
            pass
        elif isinstance(item, BspiderItem):
            return item
        elif isinstance(item, CspiderItem):
            print item