使用ElementTree返回XPath属性值 [英] Return XPath attribute value with ElementTree

问题描述

我想用这种结构评估XML文档：

I want to evaluate XML documents with this kind of structure:

<?xml version="1.0" encoding="UTF-8"?>
<Service_name version="3.3.0">
...

其中 Service_name 标签名称不是常量字符串，而需要 version 属性。

where Service_name tag name is not constant string, while version attribute is required.

为此，此xpath表达式： / * [1] / @ version 在任何xpath处理器上都可以很好地评估，但是我不知道如何使用Python ElementTree。

For that purpose this xpath expression: /*[1]/@version evaluates fine with any xpath processor, but I can't figure how with Python ElementTree.

例如：

import xml.etree.ElementTree as ET
doc = ET.parse('sample.xml')
v = find('/*[1]/@version').text

引发 KeyError：'@'

我尝试了类似的组合，但没有一个奏效。

I tried similar combinations but none that worked.

如何使用ElementTree从上述示例文档中获取版本号？

How can I get version number from above example document with ElementTree?

推荐答案

ElementTree使用自己的路径语法，该语法或多或少是xpath的子集。如果您想要具有完全xpath支持的ElementTree兼容库，请尝试 lxml 。

ElementTree uses its own path syntax, which is more or less a subset of xpath. If you want an ElementTree compatible library with full xpath support, try lxml.

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