[Zope] get Folder object from string name

I have a string that contains the name of a folder, and I want to add files to that folder with a Script(Python) method add_file_to_folder. The name of the folder is contained in the REQUEST object field 'id'. If eval worked, I could do: eval("context.Patients.%s.manage_addFile(id='', file=REQUEST.get('file'))" % REQUEST.get('id')) (So the folder I want to write to is a subfolder of 'Patients'.) But eval doesn't work in a python script. I could use an External Method, but I suspect there is a good way to do this using the Zope API. Suggestions? Thanks a bunch, John Hunter