How to replace the full content of a node using any xml lib?

I'm trying to parse a xml file using Python but I have some tags that might contain xml data. For example:

<code>
  <?xml version="1.0" encoding="utf-8"?>
</code>

I want to write CDATA tags like this:

<code><![CDATA[
  <?xml version="1.0" encoding="utf-8"?>
   ]]>
</code>

开发者_高级运维I tried (with lxml):

a = etree.fromstring(data)
for e in a.findall("code"):
    e.text = etree.CDATA(etree.tostring(e))

But I get:

<code><![CDATA[<code><?xml version="1.0" encoding="utf-8"?></code>]]>
<?xml version="1.0" encoding="utf-8"?>
</code>

Your replacement code finds the <code> element and serializes it as the new text of the element. It seems like you want to include only the children of the <code> element, though.

Try setting e.text to CDATA(e.text) instead of to the result of serializing e.

(I'm the OP i registered after posting)

With e.text = etree.CDATA(e.text)

I get

<code type="php"><![CDATA[
]]><?php echo $foo;
?>
</code>

for

<code type="php">
<?php
    echo $foo;
?>
</code>