python xml - 使用正则表达式搜索属性 [英] python xml - search for attribute with regular expressions

问题描述

在我的 xml 文件中，我有这样的节点:

In my xml file, I have nodes like this:

<waitingJobs idList="J03ac2db8 J03ac2fb0"/>

我知道如何使用 .findall 来搜索属性，但现在看来我需要使用正则表达式，因为 我不能只使用

I know how to use .findall to search for attributes but now, it looks like I would need to use regular expressions because I can't just use

root.findall('./[@attrib='value']')

我必须使用

root.findall('./[@attrib='*value*']')

问题

1. 这可以用 xml.etree 实现吗?
2. 你如何使用 lxml 做到这一点?

1. Is this possible with xml.etree?
2. How do you do this with lxml?

推荐答案

不幸的是，contains() 和 starts-with() 之类的东西不被 xml.etree.ElementTree 内置库.您可以手动检查属性，查找所有 waitingJobs 并使用 .attrib 获取idList 值:

Unfortunately, things like contains() and starts-with() are not supported by xml.etree.ElementTree built-in library. You can manually check the attribute, finding all waitingJobs and using .attrib to get to the idList value:

import xml.etree.ElementTree as ET

data = """<jobs>
    <waitingJobs idList="J03ac2db8 J03ac2fb0"/>
</jobs>
"""

root = ET.fromstring(data)
value = 'J03ac2db8'
print([elm for elm in root.findall(".//waitingJobs[@idList]") 
       if value in elm.attrib["idList"]])

通过lxml.etree，你可以使用xpath() 方法和contains() 函数:

With lxml.etree, you can use xpath() method and contains() function:

import lxml.etree as ET

data = """<jobs>
    <waitingJobs idList="J03ac2db8 J03ac2fb0"/>
</jobs>
"""

root = ET.fromstring(data)

value = 'J03ac2db8'
print(root.xpath(".//waitingJobs[contains(@idList, '%s')]" % value))

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