On Fri, 14 Nov 2008 16:38:15 -0700, Joe Strout wrote: > On Nov 14, 2008, at 4:33 PM, Jerry Hill wrote: > >> Then add >> def __init__(self): >> a = 0 >> b = 0 >> >> to your box class to make a and b instance variables. > > Doesn't that have to be "self.a" and "self.b"? Only if you want it to work :) -- Steven