pip install apscheduler

from apscheduler.schedulers.background import BackgroundScheduler


# 스케줄러 선언
schedule = BackgroundScheduler(
    timezone='Asia/Seoul',
    daemon=True,
    job_defaults={
        'max_instances': 8,
        'misfire_grace_time': None
    }
)

# 함수에 적용
@schedule.scheduled_job('cron', second='*/30')  # 30초마다 실행
def scheduler():
    print('scheduler start')
    # do something...

# 스케줄러 시작
schedule.start()

def scheduler():
    print('scheduler start')
    # do something...


# 함수에 적용
scheduler.add_job(scheduler, 'interval', seconds=15, id='scheduler_job')

# 스케줄러 시작
schedule.start()