On Tue, 2007-11-13 at 15:12 +0100, BJörn Lindqvist wrote: > L = somelist > > idx = 0 > while True: > item = L[idx] > # Do something with item > idx = (idx + 1) % len(L) > > wouldn't it be cool if there was an itertool like this: > > def circulate(L, begin = 0, step = 1): > idx = begin > while True: > yield L[idx] > idx = (idx + step) % len(L) > > for x in circulate(range(10)): > print 'at', x,'!'
For begin=0 and step=1, itertools.cycle does exactly that. For arbitrary offsets or different steps, you'd have to combine cycle with islice. -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
