[Zope] Draconian security precautions in PythonScripts

In a PythonScript I have, I am needing to iterate over a dictionary returned by another PythonScript. When I do: for key, val in container.time_extract(evt.time).iteritems(): some stuff I get an AccessControl.unauthorized.Unauthorized that says "You are not allowed to access 'a particular tuple' in this context." If I iterate over just the keys, it does the same, except for 'a particular string'. It's seeming like there are some sever restrictions on what I can do with some tuples or dictionaries. Should I be able to access them, and if so, what am I missing? Or is there a reason why this access is prohibited? TIA, -Michael