## # copyright 2009, James William Pye # http://python.projects.postgresql.org ## """ itertools extensions """ import collections from itertools import cycle def interlace(*iters) -> collections.Iterable: """ interlace(i1, i2, ..., in) -> ( i1-0, i2-0, ..., in-0, i1-1, i2-1, ..., in-1, . . . i1-n, i2-n, ..., in-n, ) """ iters = [iter(x) for x in iters] for i in cycle(range(len(iters))): yield next(iters[i])