有没有一个优雅的方式来计数标签元素在xml文件中使用python中的lxml？ [英] Is there an elegant way to count tag elements in a xml file using lxml in python?

问题描述

我可以读取xml文件的内容到一个字符串，并使用字符串操作来实现这一点，但我想有一个更优雅的方式来做到这一点。因为我没有找到一个线索在docus，我在这里sking：

I could read the content of the xml file to a string and use string operations to achieve this, but I guess there is a more elegant way to do this. Since I did not find a clue in the docus, I am sking here:

给定一个xml（见下文）文件，如何计数xml标签， 我们假设每个作者只出现一次。

Given an xml (see below) file, how do you count xml tags, like count of author-tags in the example bewlow the most elegant way? We assume, that each author appears exactly once.

<root>
    <author>Tim</author>
    <author>Eva</author>
    <author>Martin</author>
    etc.
</root>

这个xml文件很琐碎，但是作者并不总是一个接一个地列出

This xml file is trivial, but it is possible, that the authors are not always listed one after another, there may be other tags between them.

推荐答案

如果要统计所有作者标签：

If you want to count all author tags:

import lxml.etree
doc = lxml.etree.parse(xml)
count = doc.xpath('count(//author)')

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