On 3/5/2010 2:10 PM, Robert Kern wrote: > Rather, they have 0 and len(seq), respectively, when the step is > positive, and len(seq)-1 and -1 when the step is negative. >> I don't believe the actual behaviour is documented anywhere. > > True, I don't think it is. There are at least two open issues. http://bugs.python.org/issue1446619 http://bugs.python.org/issue7460