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issue8277
It couldn't work for those comments before the root element. 
It will raise an error that "xml.etree.ElementTree.ParseError: multiple elements on top level". 
Example:
test.xml
--------
<?xml version="1.0" encoding="utf-8"?>
<!-- comments here doesn't work -->
<root node>
 <nodeA />
 <!-- comments here is ok -->
 <nodeB />
</root node>
test.py
-------
from xml.etree import ElementTree
class MyTreeBuilder(ElementTree.TreeBuilder):
 def comment(self, data):
 self.start(ElementTree.Comment, {})
 self.data(data)
 self.end(ElementTree.Comment)
with open('c:/temp/t.xml', 'r') as f:
 xml = ElementTree.parse(
 f, parser=ElementTree.XMLParser(target=MyTreeBuilder()))
ElementTree.dump(xml)

Duplicate of issue 9521 (and issue 24287).