I found these too good not to share: 1) http://technicaldiscovery.blogspot.com/2012/12/passing-torch-of-numpy-and-moving-on-to.html 2) http://www.pythontutor.com/ -- Sincerely, Chris Calloway http://nccoos.org/Members/cbc office: 3313 Venable Hall phone: (919) 599-3530 mail: Campus Box #3300, UNC-CH, Chapel Hill, NC 27599