apscheduler.triggers.interval
¶
API¶
Trigger alias for add_job()
: interval
-
class
apscheduler.triggers.interval.
IntervalTrigger
(weeks=0, days=0, hours=0, minutes=0, seconds=0, start_date=None, end_date=None, timezone=None, jitter=None)¶ Bases:
apscheduler.triggers.base.BaseTrigger
Triggers on specified intervals, starting on
start_date
if specified,datetime.now()
+ interval otherwise.Parameters: - weeks (int) – number of weeks to wait
- days (int) – number of days to wait
- hours (int) – number of hours to wait
- minutes (int) – number of minutes to wait
- seconds (int) – number of seconds to wait
- start_date (datetime|str) – starting point for the interval calculation
- end_date (datetime|str) – latest possible date/time to trigger on
- timezone (datetime.tzinfo|str) – time zone to use for the date/time calculations
- jitter (int|None) – delay the job execution by
jitter
seconds at most
Introduction¶
This method schedules jobs to be run periodically, on selected intervals.
You can also specify the starting date and ending dates for the schedule through the start_date
and end_date
parameters, respectively. They can be given as a date/datetime object or text (in the
ISO 8601 format).
If the start date is in the past, the trigger will not fire many times retroactively but instead calculates the next run time from the current time, based on the past start time.
Examples¶
from datetime import datetime
from apscheduler.schedulers.blocking import BlockingScheduler
def job_function():
print("Hello World")
sched = BlockingScheduler()
# Schedule job_function to be called every two hours
sched.add_job(job_function, 'interval', hours=2)
sched.start()
You can use start_date
and end_date
to limit the total time in which the schedule runs:
# The same as before, but starts on 2010-10-10 at 9:30 and stops on 2014-06-15 at 11:00
sched.add_job(job_function, 'interval', hours=2, start_date='2010-10-10 09:30:00', end_date='2014-06-15 11:00:00')
The scheduled_job()
decorator works nicely too:
@sched.scheduled_job('interval', id='my_job_id', hours=2)
def job_function():
print("Hello World")
The jitter
option enables you to add a random component to the execution time. This might be useful if you have
multiple servers and don’t want them to run a job at the exact same moment or if you want to prevent multiple jobs
with similar options from always running concurrently:
# Run the `job_function` every hour with an extra delay picked randomly between 0 and 120 seconds.
sched.add_job(job_function, 'interval', hours=1, jitter=120)