[Zope] :records and value assignment in Python Script

Struggling with the ":records" form construct... I have a "writers" object that contains fname and lname text fields. It looks like this: [fname: "Chris", lname: "McDonough", fname: "John", lname: "Malkovich"] I need to add a new text field, auth, and I need to compute and assign it's value during the form processing. Adding new field was not that difficult: I just changed the form and added <input type="hidden" name="auth" value="">. I don't know how I would add a new field using Python... but it is not important right now. But how can I change the value? I tried this inside Python Script: for w in writers: print w.auth # this is OK. w.auth="x" # this fails with "attribute-less object (assign or del)". -- Milos Prudek