Flask demo for ap shedular cron type , Delete the sqlite file first

flask-apshedular.py

""" Demonstrating APScheduler feature for small Flask App. """

from apscheduler.schedulers.background import BackgroundScheduler
from flask import Flask
from datetime import datetime
from pytz import timezone
tz = timezone('US/Eastern')
print(datetime.now(tz) )

# https://gist.github.com/ivanleoncz/21293b00d0ea54db8ee3b57fb1170ddf
#fmt = '%Y-%m-%d %H:%M:%S %Z%z'
fmt = '%Y-%m-%d %H:%M:%S'

def sensor():
    """ Function for test purposes. """
    print("Scheduler is alive!")

from datetime import datetime
def job(job_type):
    print(f'Alarm! {datetime.now(tz).strftime(fmt)} This alarm was scheduled at {job_type}')

sched = BackgroundScheduler({
    'apscheduler.jobstores.default': {
        'type': 'sqlalchemy',
        'url': 'sqlite:///jobs.sqlite'
    },
    'apscheduler.executors.default': {
        'class': 'apscheduler.executors.pool:ThreadPoolExecutor',
        'max_workers': '20'
    },
    'apscheduler.executors.processpool': {
        'type': 'processpool',
        'max_workers': '5'
    },
    'apscheduler.job_defaults.coalesce': 'false',
    'apscheduler.job_defaults.max_instances': '3',
    'apscheduler.timezone': 'US/Eastern',
})
sched.add_job(sensor,'interval',seconds=60)
sched.add_job(job, 'cron', hour= '*', minute= '*',
                                    args= ['Every hour & Min'])
cron_time_dict = {'year': '*', 'month': 11, 'day': 6, 'week': '*', 
                    'day_of_week': '*', 'hour': '*', 'minute': '*', 'second': '*/5'}
sched.add_job(job, 'cron', **cron_time_dict,
                                    args= ['all possible & Min'])
sched.add_job(job, 'cron', day_of_week='mon-fri', hour=17 , args=['monday2friday'])

# Runs every 5 minutes at 17 o'clock a day 
sched.add_job(job, 'cron', hour= 17, minute= '*/5',
                                     args= ['job 2'])

# Schedules job to be run on the third occurrence of Friday
# on the months June, July, August, November and December
# at 00:00, 01:00, 02:00, 03:00 and 04:00
sched.add_job(job, 'cron', month= '6-8,11-12', day= '3rd fri',
                           hour= '0-4', args= ['job 4'])

# Runs from Monday to Friday at 6:30AM until 2022-06-30 00:00:00
sched.add_job(job, 'cron', day_of_week= 'mon-fri', hour= 6,
                           minute= 30, end_date= '2022-06-30',
                           args= ['job 5'])

#  job every 2 hours, during the interval of the 13th and 24th hour.
sched.add_job(job, 'cron', hour = "12-23/2", args= ['job 7'])

# When scheduling a large number of tasks to occur at a certain time, 
# this can cause a sudden spike in activity in a split second. 
# To balance these jobs out a bit, and add a random component to them 
# we use the jitter option.
# https://coderslegacy.com/python/apscheduler-cron-trigger/
sched.add_job(job, 'cron', hour = '*', jitter = 60, args= ['job 8'])


sched.start()

app = Flask(__name__)

@app.route("/home")
def home():
    """ Function for test purposes. """
    return "Welcome Home :) !"

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=8111)