[Zope] Python question

I need a python script that will return the first folder in the hierarchy above the current object. I have got this far, but it looks like content_type isn't the property I need. Can anyone help me out? Also, is there somewhere I can find a reference for this sort of thing so I don't have to keep posting to the list? p = context.aq_parent while p.content_type != "Folder": p = p.aq_parent return p