How can i use max_instances in apscheduler

[zebisnaga]

Hi, guys
I am working with 3 scripts. The first one does a request, save the data from the request and write in a csv file.
The second one is a flask app that recieves that csv and display it in a table.
The third is a clock that repeats the first script from time to time.
My problem is in the third script... i am using heroku and i cant use scheduler ... my current code is like this.

from apscheduler.schedulers.blocking import BlockingScheduler
from trainsScript import *

sched = BlockingScheduler()
@sched.scheduled_job(trigger='interval', seconds=3 ,max_instances=15)
def trains():
    try:
        data = list(getRequest())
        getTrain(data)
        print('updating 5 seconds')
    except:
        print('ERROR BRUNO')

sched.start()