'module' object has no attribute 'tostring' - elementtree with py2exe compiled django app

In that Django py2exe compiled app, I am making use of ElementTree. Code that worked properly on my development server was complaining about the ElementTree module I was using not having a tostring method.

Really? Since when does xml.etree.cElementTree (using Python 2.5 here) not have a tostring method?

The answer? When xml.etree.ElementTree isn't present. A number of the cElementTree methods are merely mapped to the ElementTree module, so if the xml.etree.ElementTree isn't included along with xml.etree.cElementTree in the py2exe includes, cElementTree will be missing components.