Python POS/cash register projects?

[ethan]

Anybody have any experience with creating a basic POS register system
in Python?  Any existing projects out there you are aware of?  This
would be a GUI app, standalone with some basic export and print
functions.  I see this as a great opportunity to deepen my Python
experience but dont want to reinvent the wheel completely..  doesn't
look like there is a lot out there..