您可以子类化scrapy.Item类，并添加一些过滤方法来检查不需要的值。
例如：

项目.py

from scrapy import Item, Field

class QuoteItem(Item):
    text = Field()
    source = Field()
    tags = Field()

    def check_source(self, value):
        if value not in ["J.K. Rowling", "Albert Einstein", "Dr. Seuss"]:
            return self["source"] = ""
        self["source"] = value

    def check_text(self, value):
        self["text"] = value

    def check_tags(self, lst):
        if "religion" in lst:
            return self["tags"] = ""
        self["tags"] = lst

引号.py

import scrapy
from ..items import QuoteItem
class QuotesSpider(scrapy.Spider):
    name = 'quotes'
    allowed_domains = ['quotes.toscrape.com']
    start_urls = ['http://quotes.toscrape.com/']

    def parse(self, response):
        for quote in response.xpath('//div[@class="quote"]'):
            item = QuoteItem()
            item.check_text(quote.xpath('./span[@class="text"]/text()').get())
            item.check_source(quote.xpath('.//small[@class="author"]/text()').get())
            item.check_tags(quote.xpath('.//a[@class="tag"]/text()').getall())
            yield item
        next_page = response.xpath('//li[@class="next"]/a/@href').get()
        yield scrapy.Request(response.urljoin(next_page), callback=self.parse)