John, If you are really frustrated with this one (like I was on 14), email me off-list to get further hints. I'm willing to help you out.
I wish that someone was around to help me work through some of these. I really think they are more fun/helpful when you work on them with another person so if you don't see something in the riddle, they just might. For me, this is more about learning python than about solving the riddles. -- http://mail.python.org/mailman/listinfo/python-list
