How to execute a recurrent task in a Flask app?

In some projects, we need to do dome recurrent tasks while running a Flask API.

So do be able to do it in a Flask project, we need to use APScheduler.
With this tool, we are able to create background schedulers which will execute our recurrent task.

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Install

Using pip, you can install the library as follow.

pip install APScheduler

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Usage

To use it, check the following example.

import time
import atexit

from apscheduler.schedulers.background import BackgroundScheduler

# Declaration of the task as a function.
def print_date_time():
    print(time.strftime("%A, %d. %B %Y %I:%M:%S %p"))


# Create the background scheduler
scheduler = BackgroundScheduler()
# Create the job
scheduler.add_job(func=print_date_time, trigger="interval", seconds=3)
# Start the scheduler
scheduler.start()

# /!\ IMPORTANT /!\ : Shut down the scheduler when exiting the app
atexit.register(lambda: scheduler.shutdown())

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Links

• APScheduler library : https://pypi.org/project/APScheduler/

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I hope it will help you! 🍺