Antoine Pitrou <pitrou@free.fr> added the comment: I see. So the problem you are pointing out is that the tasks *arguments* are consumed eagerly. I agree that may be a problem in some cases, though I think in most cases people are concerned with the *results*. (note that multiprocessing.Pool() has an imap() method which does what you would like) ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue32306> _______________________________________