[Zope] python variables rendered by dtml

This is going to sound convoluted, but trust me, it's this way on purpose. I have a python script that gets a result back from an unparameterized zsql query like this- foo = container.get_stuff_sql() I then make some alterations to 'foo' in my script which I will leave out for clarity. I then want to render 'foo' from a dtml method with a dtml-in clause. What is to best way to pass 'foo' into the dtml method? (I'm having internet problems and I can't get to Zope labs right now, or I'd look it up myself.)