Nick Drew writes:

I'm a newbie zopista, and python for that matter...

In brief: I get a NameError when invoking "filter(...)" from DTML. I thought this was a built-in python method, so I'm a bit puzzled.

For security reasons, Zope are removed all builtin-functions from DTML expressions. You can access some of the builtin objects as attributes/methods the special variable "_". Look in the DTML reference (e.g. at URL:http://zdp.zope.org) for a list of available builtins in "_". Dieter