获取元素的属性及其对应的ID [英] getting attribute of an element with its corresponding Id

问题描述

假设我有这个xml文件:

suppose that i have this xml file :

<article-set xmlns:ns0="http://casfwcewf.xsd" format-version="5">
<article>
 <article id="11234">
     <source>
     <hostname>some hostname for 11234</hostname>
     </source>
     <feed>
         <type weight=0.32>RSS</type>
     </feed>
     <uri>some uri for 11234</uri>
 </article>
 <article id="63563">
     <source>
     <hostname>some hostname for 63563 </hostname>
     </source>
     <feed>
         <type weight=0.86>RSS</type>
     </feed>
     <uri>some uri  for 63563</uri>
  </article>
.
.
.
</article></article-set>

我想要的是在整个文档的RSS中打印每个具有其特定属性权重的文章ID(像这样).

what I want, is to print each article id with its specific attribute weight in RSS for the whole document (like this).

id=11234 
weight= 0.32


id=63563 
weight= 0.86
.
.
.

我用这段代码来做到这一点，

I used this code to do so,

from lxml import etree
tree = etree.parse("C:\\Users\\Me\\Desktop\\public.xml")


for article in tree.iter('article'):
    article_id = article.attrib.get('id')

    for weight in tree.xpath("//article[@id={}]/feed/type/@weight".format(article_id)):
        print(article_id,weight)

它没有用，有人可以帮我吗?

and it did not work, could someone help me with this?

推荐答案

如果您确实想这样做，可以分两行进行 .

You can do it in two lines if you really want to do so.

>>> from lxml import etree
>>> tree = etree.parse('public.xml')
>>> for item in tree.xpath('.//article[@id]//type[@weight]'):
...     item.xpath('../..')[0].attrib['id'], item.attrib['weight']
... 
('11234', '0.32')
('63563', '0.86')

我使用的一个xml检查器坚持将weight的值括在双引号中. etree在xml上发出嘶哑的声音，直到我将文件的第一行删除为止.我不知道为什么.

One xml checker I used insisted on double-quotes around the values for weight. etree croaked on the xml until I dropped the first line in the file; I don't know why.

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