window / cons / fencepost / slice functions: +1 (with a flag to say if you want to truncate or pad incomplete tuples at end of input sequence.
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/303279 http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/303060 http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/347689 Probably more recipes in there, (and not CPAN-ish yet) but multiple submissions bespeak a certain need, i think. -- http://mail.python.org/mailman/listinfo/python-list
