[Zope] Casting to a list

[Ken Kinder]

Another question (soon I'll start answering more on this list :) - I
have a set of checkboxes with the same name that I iterate through
using dtml-in. However, when only one checkbox is checked, dtml-in
complains that a string cannot be used as input, it expects a
sequence. My initial thought was to do this:

<dtml-if "type(var) == type('')">
  ... (do not iterate)
<dtml-else>
  <dtml-in var>
    ...
  </dtml-in>
</dtml-if>

How can I either cast a string to a list w/o messing up an existing
list, or gain access to Python functions such as type() from a
dtml-if statement?

-- 
Ken Kinder
303.381.7631