[Zope] Rendering other objects with python script

Hi! I'm wondering how I can get the rendering that DocumentTemplates seem to apply automatically with Python Scripts: <dtml-var "_['testname']"> return getattr(context,"testname") gives me "<Folder instace ...>" Trying to augment it with: return getattr(context,"testname")() or return getattr(context,"testname")(request) only gives me KeyErrors too :( Andreas