在 XML 中获取（和求和）所有名为“test”的属性的值

Question

Example XML doc:

<main>
  <this test="500">
    <that test="200"/>
  </this>
</main>

Result: 700

All the existing code snippets I've found on this site and others rely on a tag. For example, you could only get "500" if you reference both "this" and "test". I'm looking to search only for "test" throughout the entire doc/string.

Some modules that I've tried (and resulted in failure) are lxml, xml.dom, ElementTree, xmltodict, and BeautifulSoup,

Answer 1

I'd suggest to favor lxml for parsing XML in python. lxml has full xpath 1.0 support, and xpath is the language/technology designed specifically for querying XML.

Once you have the right tool for the right job, you can do something like this fe :

import lxml.etree as et

xml = """<main>
  <this test="500">
    <that test="200"/>
  </this>
</main>"""
doc = et.fromstring(xml)
result = doc.xpath("sum(//@test)")
print(result)

output :

700.0

brief explanation about xpath being used :

• //@test : find all test attribute anywhere in the XML document.
• sum() : return sum of the parameter