XML : add element in a existing xml file python

I have a existing xml file as following:

  <vehicleTravelTimeMeasurements>          <vehicleTravelTimeMeasurement name="ckkkkkkkkkk" no="2">              <start link="1" pos="3.864983"/>              <end link="3" pos="23.275375"/>          </vehicleTravelTimeMeasurement>          <vehicleTravelTimeMeasurement name="" no="3">              <start link="1" pos="3.864983"/>              <end link="2" pos="13.275375"/>          </vehicleTravelTimeMeasurement>  </vehicleTravelTimeMeasurements>    

I am trying to construct the same format as shown above by using xml.etree.cElementTree, and add them into the xml correctly:

  new = ET.Element("vehicleTravelTimeMeasurement", name = "kkk", no = "4")  newsub1 =  ET.Element("start", link = "1", pos="3.88888")  newsub2 = ET.Element("end",link = "3", pos = "3.88888")    

could someone help me out with this?

Thank you in advance!