Comment 5 for bug 81890

The module python ElementTree is now included in python2.5, so the package python-elementtree is now deprecated.

And about your problem, it is because the module has been renamed, as you can see here:
http://www.python.org/dev/summary/2006-04-01_2006-04-15/#elementtree-naming

The new name for it is xml.etree but it's the same module.

If you have any other question, feel free to ask it.

Thanks
Pochu