Question

我有以下XML元素：

<AdditionalAttribute name="Internal Version Identifier" value="UCV261KSBQGBPYF6" dataType="String"></AdditionalAttribute>

这些标签有很多，我想具体针对这个标签。一些标签的例子如下：

<AdditionalAttribute name="Version Notes" value="This Item was released indirectly as a result of releasing Item 10X9061-11 to In Design." dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Change Number" value="BCV2386079506" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Version Shared" value="No" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Effective Version Shared" value="No" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Material Effectivity Date" value="2016-03-15T08:52:33-08:00" dataType="String"></AdditionalAttribute>

<AdditionalAttribute name="Internal Version Identifier" value="UCV261KSBQGBPYF6" dataType="String"></AdditionalAttribute>                    
<AdditionalAttribute name="Item Creation Date" value="2016-03-01T09:08:14-08:00" dataType="String"></AdditionalAttribute>

我使用lxml和xpath尝试查询“内部版本标识符”的所有其他属性，一旦我有了需要从'value'字段中提取值的元素。

我想找到名称=“内部版本标识符”的AdditionalAttribute元素，然后在“value”字段中获取值。

我一直在尝试一些不同的东西但却无法获得我需要的价值：

这是我当前的xpath查询：

tree.xpath('//AdditionalAttribute[starts-with(text(), "Internal")]')

Answer 1

尝试//AdditionalAttribute[@name="Internal Version Identifier"]。

经过测试的例子：

from lxml import etree

tree = etree.XML('''
<root>
<AdditionalAttribute name="Version Notes" value="This Item was released indirectly as a result of releasing Item 10X9061-11 to In Design." dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Change Number" value="BCV2386079506" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Version Shared" value="No" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Effective Version Shared" value="No" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Material Effectivity Date" value="2016-03-15T08:52:33-08:00" dataType="String"></AdditionalAttribute>

<AdditionalAttribute name="Internal Version Identifier" value="UCV261KSBQGBPYF6" dataType="String"></AdditionalAttribute>
<AdditionalAttribute name="Item Creation Date" value="2016-03-01T09:08:14-08:00" dataType="String"></AdditionalAttribute>
</root>
''')

elements = tree.xpath('//AdditionalAttribute[@name="Internal Version Identifier"]')
assert len(elements) == 1
assert elements[0].attrib["value"] == 'UCV261KSBQGBPYF6'

或者，如果您只对value而不是整个元素感兴趣：

elements = tree.xpath(
    '//AdditionalAttribute[@name="Internal Version Identifier"]/@value')

assert len(elements) == 1
assert elements[0] == 'UCV261KSBQGBPYF6'

Answer 2

您可以使用：//AdditionalAttribute/@value; 它会抓住：value="UCV261KSBQGBPYF6"

lxml - 元素上元标记的访问值

2 个答案: