On Thu, Jun 1, 2017 at 4:14 AM, Gregory Ewing <greg.ew...@canterbury.ac.nz> wrote: > guillaume.pau...@giome.fr wrote: >> >> def cycle_once(iterable, start): >> return chain(islice(iterable, start, None), islice(iterable, start))
This assumes that iterable is restartable, which is not the case if iterable is itself an iterator. > Another variation, maybe slightly more efficient: > > from itertools import islice, cycle > > def cycle_once(iterable, start): > return islice(cycle(iterable), start, start + len(iterable)) Similar problem here, len will fail on an iterator. I know the OP specified a tuple (and that was what my own solution assumed), but "iterable" implies broader applicability. -- https://mail.python.org/mailman/listinfo/python-list
