Python Scrapy 获取文章正文，extract_first() 获取None答案

【问题标题】：Python Scrapy get article body, extract_first() get NonePython Scrapy 获取文章正文，extract_first() 获取None
【发布时间】：2018-10-29 06:39:59
【问题描述】：

我尝试使用 Scrapy 从新闻网站获取文章正文。

import scrapy
import sys 
import json

class ReutersPage(scrapy.Spider):
    name = "reutersPage"
    start_urls = [
        'https://www.reuters.com/article/chile-sqm-stocks/lithium-miner-sqm-shares-up-2-7-pct-chile-court-clears-way-for-tianqi-stake-purchase-idUSC0N1OX01C'
    ]


    def parse(self, response):
        articleBody = response.css('div.StandardArticleBody_body::text').extract_first()
        print('######## Article body ##########')
        print(articleBody)
        yield {
            'body': articleBody
        }

我尝试在 div StandardArticleBody_body 中获取文本，但总是得到 None 值。

输出是

2018-10-26 14:23:44 [scrapy.core.engine] INFO: Spider opened
2018-10-26 14:23:44 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2018-10-26 14:23:44 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2018-10-26 14:23:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.reuters.com/robots.txt> (referer: None)
2018-10-26 14:23:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.reuters.com/article/chile-sqm-stocks/lithium-miner-sqm-shares-up-2-7-pct-chile-court-clears-way-for-tianqi-stake-purchase-idUSC0N1OX01C> (referer: None)
######## Parse article ##########
######## Article body ##########
None
2018-10-26 14:23:45 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.reuters.com/article/chile-sqm-stocks/lithium-miner-sqm-shares-up-2-7-pct-chile-court-clears-way-for-tianqi-stake-purchase-idUSC0N1OX01C>
{'body': None}
2018-10-26 14:23:45 [scrapy.core.engine] INFO: Closing spider (finished)

【问题讨论】：

标签： python scrapy scrapy-spider

【解决方案1】：

没有任何文本直接属于您选择的div，而是属于它的后代。选择器路径和:: 之间的空格将获得所有后代的text，而不仅仅是您选择的节点的文本。

试试这个

articleBody = response.css('div.StandardArticleBody_body ::text').extract_first()

这样您就可以获得div 后代的所有文本。

【讨论】：

抱歉，我刚刚更新了我的答案，因为我将 XPATH 语法与 CSS 选择器混合在一起。

【解决方案2】：

In [27]: response.css('div.StandardArticleBody_body > p::text').extract()
Out[27]: 
['SANTIAGO, Oct 26 (Reuters) - Shares in lithium miner SQM jumped 2.7 percent on          Friday after Chile’s Constitutional Court rejected a lawsuit to block Chinese miner Tianqi Lithium Corp’s $4.1 billion purchase of a stake in the Chilean lithium miner. ',
'SQM’s B-series shares touched 29,400 pesos ($42.55) at the open of Santiago’s Stock Exchange. ']

【讨论】：