scrapy回调函数传递参数

scrapy.Request 的callback传参的两种方式

1.使用 lambda方式传递参数

def parse(self, response):
    for sel in response.xpath('//li[@class="clearfix"]/div[@class="list_con"]'):
        item=DmozItem()
        item['href']=sel.xpath('h2/a/@href').extract()[0]
        yield scrapy.Request(item['href'], callback=lambda response, it=item: self.others_parse(response,it),dont_filter=True)
        yield item

def others_parse(self, response, it):
    it['url'] = response.url
    yield it

2.在某些情况下，您可能有兴趣向这些回调函数传递参数，以便稍后在第二个回调中接收参数。您可以使用该Request.meta属性。

def parse(self, response):
    for sel in response.xpath('//li[@class="clearfix"]/div[@class="list_con"]'):
        item=DmozItem()
        item['href']=sel.xpath('h2/a/@href').extract()[0]

        request= scrapy.Request(item['href'], callback=others_parse,dont_filter=True)
        request.meta['item'] = item
        yield request

def others_parse(self, response):
    item = response.meta['item']
    item['other_url'] = response.url
    yield item

https://www.jianshu.com/p/461d74641e80