How to schedule a function to run every hour on Flask?

Question

I have a Flask web hosting with no access to cron command.

How can I execute some Python function every hour?

Answer 1

You might want to use some queue mechanism with scheduler like RQ scheduler or something more heavy like Celery (most probably an overkill).

Answer 2

I've tried using flask instead of a simple apscheduler what you need to install is

pip3 instal flask_apscheduler

Below is the sample of my code:

from flask import Flask
from flask_apscheduler import APScheduler

app = Flask(__name__)
scheduler = APScheduler()

def scheduleTask():
    print("This test runs every 3 seconds")

if __name__ == '__main__':
    scheduler.add_job(id = 'Scheduled Task', func=scheduleTask, trigger="interval", seconds=3)
    scheduler.start()
    app.run(host="0.0.0.0")

Answer 3

Another alternative might be to use Flask-APScheduler which plays nicely with Flask, e.g.:

• Loads scheduler configuration from Flask configuration,
• Loads job definitions from Flask configuration

More information here:

https://pypi.python.org/pypi/Flask-APScheduler