Faithfully Preserve Comments in Parsed XML

Question

I\'d like to preserve comments as faithfully as possible while manipulating XML.

I managed to preserve comments, but the contents are getting XML-escaped.

Answer 1

Martin's Code didn't work for me. I modified the same with the following which works as intended.

import xml.etree.ElementTree as ET

class CommentedTreeBuilder(ET.XMLTreeBuilder):
    def __init__(self, *args, **kwargs):
        super(CommentedTreeBuilder, self).__init__(*args, **kwargs)
        self._parser.CommentHandler = self.comment

    def comment(self, data):
        self._target.start(ET.Comment, {})
        self._target.data(data)
        self._target.end(ET.Comment)

This is the test

    parser=CommentedTreeBuilder()
    tree = ET.parse(filename, parser)
    tree.write('out.xml')