Celery is the most advanced task queue in the Python ecosystem and usually considered as a de facto when it comes to process tasks simultaneously in the background. The lastest version is 4.0.2, community around Celery is pretty big (which includes big corporations such as Mozilla, Instagram, Yandex and so on) and constantly evolves. Hence investing your time in this technology pays back.
This article is not about how to set up Celery, installation is pretty straightforward and instructions can be found on the official website. Instead, I would like to emphasize your attention on best practices while working with Celery.