from xml.etree import ElementTree as et
data = """<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<gx:Track>
<when>2012-03-10T05:52:38.564-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
<when>2012-03-10T06:00:39.748-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
</gx:Track>
</kml>
"""
kmlTree = et.fromstring(data)
How to find element in KML tree containing ':'