Comment by ryanhiebert

I'm working on queueio (https://github.com/ryanhiebert/queueio), a background task runner for python that uses asyc function to communicate with the queueing system, but encourages using regular synchronous and blocking code for the actual work.

It fits the bill for me where function coloring provides something truly useful that you can't get without threading. Using Celery canvas to compose signatures is a great step, but the added power of being able to compose them in a more standard code flow is the killer feature that I wanted bad enough to write it myself.