使用lxml向现有元素添加属性，删除元素等 [英] Adding attributes to existing elements, removing elements, etc with lxml

问题描述

我使用XML解析

from lxml import etree

tree = etree.parse('test.xml', etree.XMLParser())

现在，我要处理已解析的XML.我无法删除具有名称空间的元素，或者仅删除一般的元素，例如

Now I want to work on the parsed XML. I'm having trouble removing elements with namespaces or just elements in general such as

<rdf:description><dc:title>Example</dc:title></rdf:description>

，我想删除整个元素以及标记中的所有内容.我也想向现有元素添加属性.我需要的方法在Element类中，但是在这里我不知道如何将其与ElementTree对象一起使用.任何指针都将不胜感激，谢谢

and I want to remove that entire element as well as everything within the tags. I also want to add attributes to existing elements as well. The methods I need are in the Element class but I have no idea how to use that with the ElementTree object here. Any pointers would definitely be appreciated, thanks

推荐答案

您可以通过以下调用进入根元素:root=tree.getroot()

You can get to the root element via this call: root=tree.getroot()

使用该根元素，您可以使用findall()并删除符合条件的元素:

Using that root element, you can use findall() and remove elements that match your criteria:

deleteThese = root.findall("title")
for element in deleteThese: root.remove(element)

最后，您可以使用以下代码查看新树的外观:etree.tostring(root, pretty_print=True)

Finally, you can see what your new tree looks like with this: etree.tostring(root, pretty_print=True)

以下是有关find/findall工作方式的一些信息: http://infohost.nmt.edu/tcc /help/pubs/pylxml/class-ElementTree.html#ElementTree-find

Here is some info about how find/findall work: http://infohost.nmt.edu/tcc/help/pubs/pylxml/class-ElementTree.html#ElementTree-find

要将属性添加到元素，请尝试如下操作:

To add an attribute to an element, try something like this:

root.attrib['myNewAttribute']='hello world'

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