我如何在scrapy python中使用多个请求并在它们之间传递项目 [英] How can i use multiple requests and pass items in between them in scrapy python

问题描述

我有 item 对象，我需要将它传递到多个页面以将数据存储在单个项目中

I have the item object and i need to pass that along many pages to store data in single item

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class DmozItem(Item):
    title = Field()
    description1 = Field()
    description2 = Field()
    description3 = Field()

现在这三个描述位于三个单独的页面中.我想做一些类似的事情

Now those three description are in three separate pages. i want to do somrething like

现在这适用于 parseDescription1

def page_parser(self, response):
    sites = hxs.select('//div[@class="row"]')
    items = []
    request =  Request("http://www.example.com/lin1.cpp",  callback =self.parseDescription1)
    request.meta['item'] = item
    return request 

def parseDescription1(self,response):
    item = response.meta['item']
    item['desc1'] = "test"
    return item

但我想要类似的东西

def page_parser(self, response):
    sites = hxs.select('//div[@class="row"]')
    items = []
    request =  Request("http://www.example.com/lin1.cpp",  callback =self.parseDescription1)
    request.meta['item'] = item

    request =  Request("http://www.example.com/lin1.cpp",  callback =self.parseDescription2)
    request.meta['item'] = item

    request =  Request("http://www.example.com/lin1.cpp",  callback =self.parseDescription2)
    request.meta['item'] = item

    return request 

def parseDescription1(self,response):
    item = response.meta['item']
    item['desc1'] = "test"
    return item

def parseDescription2(self,response):
    item = response.meta['item']
    item['desc2'] = "test2"
    return item

def parseDescription3(self,response):
    item = response.meta['item']
    item['desc3'] = "test3"
    return item

推荐答案

没问题.以下是您的代码的正确版本:

No problem. Following is correct version of your code:

def page_parser(self, response):
      sites = hxs.select('//div[@class="row"]')
      items = []

      request = Request("http://www.example.com/lin1.cpp", callback=self.parseDescription1)
      request.meta['item'] = item
      yield request

      request = Request("http://www.example.com/lin1.cpp", callback=self.parseDescription2, meta={'item': item})
      yield request

      yield Request("http://www.example.com/lin1.cpp", callback=self.parseDescription3, meta={'item': item})

def parseDescription1(self,response):
            item = response.meta['item']
            item['desc1'] = "test"
            return item

def parseDescription2(self,response):
            item = response.meta['item']
            item['desc2'] = "test2"
            return item

def parseDescription3(self,response):
            item = response.meta['item']
            item['desc3'] = "test3"
            return item

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