python - HTML 表格与 python 美丽汤

Question

我有一个 HTML 表格，如下所示:

<table border=0 cellspacing=1 cellpadding=2 class=form>
<tr class=form><td class=formlabel>Heating Coils in Bunker Tanks</td><td class=form>N</td></tr>
<tr class=forma><td class=formlabel>Heating Coils in Cargo Tanks</td><td class=form>U</td></tr>
<tr class=form><td class=formlabel>Manifold Type</td><td class=form>N</td></tr>
<tr class=forma><td class=formlabel>No. Holds</td><td class=form>5</td></tr>
<tr class=form><td class=formlabel>No. Centreline Hatches</td><td class=form>5</td></tr>
<tr class=forma><td class=formlabel>Lifting Gear</td><td class=form>Yes</td></tr>
<tr class=form><td class=formlabel>Gear</td><td class=form>4 Crane (30.5t SWL)</td></tr>
<tr class=forma><td class=formlabel>Alteration</td><td class=form>Unknown</td></tr>
</table>

我正在使用 Beautiful soup 来提取来自 scrapy 蜘蛛响应的特定数据

soup = BeautifulSoup(response.body_as_unicode())
table= soup.find('table', {'class': 'form'})
# psusedo code find manifold type and number of Holds

我该如何执行此操作。请注意，值的顺序可能会发生变化，但表单标签始终保持不变？如何使用特定表单标签进行搜索？

编辑:

<tr class=forma><td class=formlabel>Fleet Manager (Operator)</td><td class=form><a href="oBasic.asp?LRNumber=9442964&Action=Display&LRCompanyNumber=40916">ESSAR SHIPPING LTD</a></td></tr>

这种特殊情况不适用于以下同级搜索？如何克服这个问题？

Answer 1

您可以找到td元素by text并获取 next sibling :

table.find('td', text='Manifold Type').next_sibling.text

顺便说一句，为什么需要在 Scrapy 蜘蛛中使用 BeautifulSoup ？ Scrapy 本身在 HTML 解析、定位元素方面非常强大:

response.xpath('//table[@class="form"]//td[.="Manifold Type"]/following-sibling::td/text()')

来自 scrapy shell 的演示:

$ scrapy shell index.html
In [1]: response.xpath('//table[@class="form"]//td[.="Manifold Type"]/following-sibling::td/text()').extract()
Out[1]: [u'N']