Newbie NameError problem

[MartinRinehart at gmail.com]

Thanks to all!

I will put my class defs first (tho not without expressing my
disappointment that this is required in a late 20th century language);
learn about enumerate as it looks like exactly what I need and discard
my C++/Java based object model because this is a totally other thing.

If someone who knows both object models would comment on Python's
model v. C++/Java's model that would be helpful.