Scheduling a function to run every hour on Flask

I have a Flask web hosting with no access to cron command. How can I execute some Python function every hour?

You can use BackgroundScheduler() from APScheduler package (v3.5.3):

    import time
    import atexit

    from apscheduler.schedulers.background import BackgroundScheduler

    def print_date_time():
        print(time.strftime("%A, %d. %B %Y %I:%M:%S %p"))

    scheduler = BackgroundScheduler()
    scheduler.add_job(func=print_date_time, trigger="interval", seconds=3)

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

Note that two of these schedulers will be launched when Flask is in debug mode. For more information, check out this question.