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使用以下pipeline即可：

from scrapy.exceptions import DropItem

class DuplicatesPipeline(object):

    def __init__(self):
        self.ids_seen = set()

    def process_item(self, item, spider):
        if item['id'] in self.ids_seen:
            raise DropItem("Duplicate item found: %s" % item)
        else:
            self.ids_seen.add(item['id'])
            return item

from scrapy.exceptions import DropItem

class DuplicatesPipeline(object):

def __init__(self):

self.ids_seen = set()

def process_item(self, item, spider):

if item['id'] in self.ids_seen:

raise DropItem("Duplicate item found: %s" % item)

else:

self.ids_seen.add(item['id'])

return item

【摘自：】https://docs.scrapy.org/en/latest/topics/item-pipeline.html#duplicates-filter

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