Bruce Frederiksen: Your solution is a bit different from what I was thinking about (I was thinking about a generator function, with yield), but it works.
This line: > return itertools.chain( > itertools.imap(lambda ys: x + ys, ncsub(xs, s + p1)), > ncsub(xs, s + p2)) Can be written in a simpler way: return chain((x + ys for ys in ncsub(xs, s + p1)), ncsub(xs, s + p2)) I'll think more about all this, bye and thank you, bearophile -- http://mail.python.org/mailman/listinfo/python-list
