I’m on Windows 7. I have Python 2 and 3 in different directories. I have a script that changes the PATH variable to put one or the other in the path. Primitive but effective. All my calls are to python, never to python3. The kicost script runs with either python 2 or 3.
I doubt your xml file is the problem. I attached an XML file for you to try.
test.xml (28.8 KB)