python - Scrapy 抓取刀无法抓取过第一页

Question

我正在学习 scrapy 教程 here 。我相信，我得到了与教程相同的代码，但我的抓取工具仅抓取第一页，然后将有关我的第一个 Request 的以下消息提供给另一个页面，然后完成。我是否可能在错误的位置得到了第二个 yield 语句？

DEBUG: Filtered offsite request to 'newyork.craigslist.org': https://newyork.craigslist.org/search/egr?s=120>

2017-05-20 18:21:31 [scrapy.core.engine] INFO: Closing spider (finished)

这是我的代码:

import scrapy
from scrapy import Request


class JobsSpider(scrapy.Spider):
    name = "jobs"
    allowed_domains = ["https://newyork.craigslist.org/search/egr"]
    start_urls = ['https://newyork.craigslist.org/search/egr/']

    def parse(self, response):
        jobs = response.xpath('//p[@class="result-info"]')

        for job in jobs:
            title = job.xpath('a/text()').extract_first()
            address = job.xpath('span[@class="result-meta"]/span[@class="result-hood"]/text()').extract_first("")[2:-1]
            relative_url = job.xpath('a/@href').extract_first("")
            absolute_url = response.urljoin(relative_url)

            yield {'URL': absolute_url, 'Title': title, 'Address': address}

        # scrape all pages
        next_page_relative_url = response.xpath('//a[@class="button next"]/@href').extract_first()
        next_page_absolute_url = response.urljoin(next_page_relative_url)

        yield Request(next_page_absolute_url, callback=self.parse)

Answer 1

好吧，我明白了。我必须更改这一行:

allowed_domains = ["https://newyork.craigslist.org/search/egr"]

对此:

allowed_domains = ["newyork.craigslist.org"]

现在它可以工作了。