huey is:

    a task queue (2019-04-01: version 2.0 released)
    written in python (2.7+, 3.4+)
    clean and simple API
    redis, sqlite, or in-memory storage
    example code.

huey supports:

    multi-process, multi-thread or greenlet task execution models
    schedule tasks to execute at a given time, or after a given delay
    schedule recurring tasks, like a crontab
    automatically retry tasks that fail
    task prioritization
    task result storage
    task locking
    task pipelines and chains

WWW: https://pypi.org/project/huey