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Celery: http://celeryproject.org

You can easily add Celery to your flask application like this:

app.py::

from flask_celery import Celery

celery = Celery()

def create_app():
    app = Flask(__name__)

    celery.init_app(app)

    return app

@celery.task
def add(x, y):
    return x + y

To start the worker you can then launch the celery worker command by pointing to your celery app instance::

$ celery -A app:celery worker -l info

If your flask application has complex condition, you can refer to the example https://github.com/taogeT/flask-celery .