lxml:获取具有特定子元素的元素? [英] lxml: get element with a particular child element?

问题描述

在lxml中工作时，我想获取具有title="Go to next page"的img子级的所有链接的href属性.

Working in lxml, I want to get the href attribute of all links with an img child that has title="Go to next page".

因此，在以下代码段中:

So in the following snippet:

<a class="noborder" href="StdResults.aspx">
<img src="arrowr.gif" title="Go to next page"></img>
</a>

我想找回StdResults.aspx.

我已经走了这么远:

next_link = doc.xpath("//a/img[@title='Go to next page']") 
print next_link[0].attrib['href']

但是next_link是img，而不是a标签-如何获得a标签?

But next_link is the img, not the a tag - how can I get the a tag?

谢谢.

推荐答案

只需将a/img...更改为a[img...] :(方括号中的意思是诸如此类")

Just change a/img... to a[img...]: (the brackets sort of mean "such that")

import lxml.html as lh

content='''<a class="noborder" href="StdResults.aspx">
<img src="arrowr.gif" title="Go to next page"></img>
</a>'''

doc=lh.fromstring(content)
for elt in doc.xpath("//a[img[@title='Go to next page']]"):
    print(elt.attrib['href'])

# StdResults.aspx

或者，您可以走得更远并使用

Or, you could go even farther and use

"//a[img[@title='Go to next page']]/@href"

检索href属性的值.

to retrieve the values of the href attributes.

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