[Zope] create File object from Python Script?

O.k., I'm stumped. I've been looking over old messages and source code, but I haven't come to enlightenment on creating a File from a string. I can only create one from an uploaded file. I thought maybe I was on to something with using StringIO, but that's not allowed. I'd greatly appreciate a pointer to anything that might get me started. Thank you. --kyler