Python 3: Launch multiple commands(subprocesses) in parallel (but upto 4 any time at same time) AND store each of their outputs into a variable

[Paul Rubin]

Dale Marvin <dmarv at dop.com> writes:
> The best way is a matter of opinion, I have had success using Celery
> with Redis. <http://www.celeryproject.org/>

I generally use GNU Parallel for stuff like that.  Celery looks
interesting though much fancier.