Neal Becker wrote: > Is there any canned iterator adaptor that will > > transform: > in = [1,2,3....] > > into: > out = [(1,2,3,4), (5,6,7,8),...] > > That is, each time next() is called, a tuple of the next N items is > returned.
Depending on what you want to do with items that don't make a complete N- tuple: >>> from itertools import * >>> items = range(10) >>> list(izip(*(iter(items),)*3)) [(0, 1, 2), (3, 4, 5), (6, 7, 8)] >>> list(izip_longest(*(iter(items),)*3)) [(0, 1, 2), (3, 4, 5), (6, 7, 8), (9, None, None)] >>> list(takewhile(bool, imap(tuple, starmap(islice, repeat((iter(items), 3)))))) [(0, 1, 2), (3, 4, 5), (6, 7, 8), (9,)] Peter -- http://mail.python.org/mailman/listinfo/python-list
