[Zope] Using tal and no dmtl.

We are trying to use only TAL in our Zope documents. It's been frustrating in some ways. Is there a way in TAL to simply run a python function? We've been using the omit-tag to do this, but I find this cludgy. <div tal:omit-tag="python:foo()"></div> Are other people just using dmtl for this sort of thing. Is there a way to do it in TAL that isn't cludgy? John -