On 1/1/2015 7:36 PM, lucas mvm wrote: a different introduction to the same code posted 6 hours earlier.
Read and study both of the answers already given about an hour after the first post. Ignoring them and reposting, with 'NEED HELP!' no less, is rude. I strongly suggest you do the exercise suggested by Rick.
-- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list