David M. Cooke wrote: > At some point, featherstone80 at hotmail.com (Narsil) wrote: >>NameError: global name 'sum' is not defined >> >>What did I do wrong? > > > 'sum' as a builtin was introduced in python 2.3. You're using an older > version. > If you don't have sum, try: reduce(lambda x,y: x+y, numberlist) instead. --Irmen