When using xml.etree.ElementTree to parse external XML files, all XML comments within that file are being stripped out. I guess that happens because there is no comment handler in the expat parser.

Example:

test.xml
--------
<example>
  <nodeA />
  <!-- some comment -->
  <nodeB />
</example>

test.py
-------
from xml.etree import ElementTree
with open( 'test.xml', 'r' ) as f:
    xml = ElementTree.parse( f )
ElementTree.dump( xml )

Result
------
<example>
  <nodeA />

  <nodeB />
</example>