Scheduling Python Script to run every hour accurately

Question

Before I ask  Cron Jobs and Task Scheduler will be my last options  this script will be used across Windows and Linux and I d prefer to have a coded out method of doing this than leaving this to the end user to complete  Is there a library for Python that I can use to schedule tasks  I will need to run a function once every hour  however  over time if I run a script once every hour and use  sleep   quot once every hour quot  will run at a different part of the hour from the previous day due to the delay inherent to executing running the script and or function  What is the best way to schedule a function to run at a specific time of day  more than once  without using a Cron Job or scheduling it with Task Scheduler  Or if this is not possible  I would like your input as well  AP Scheduler fit my needs exactly  Version  lt  3 0 import datetime import time from apscheduler scheduler import Scheduler    Start the scheduler sched   Scheduler   sched daemonic   False sched start    def job function        print  quot Hello World quot       print datetime datetime now        time sleep 20     Schedules job function to be run once each minute sched add cron job job function   minute  0-59    out   gt Hello World  gt 2014-03-28 09 44 00 016 492  gt Hello World  gt 2014-03-28 09 45 00 0 14110  Version  gt  3 0  From Animesh Pandey s answer below  from apscheduler schedulers blocking import BlockingScheduler  sched   BlockingScheduler     sched scheduled job  interval   seconds 10  def timed job        print  This job is run every 10 seconds      sched scheduled job  cron   day of week  mon-fri   hour 10  def scheduled job        print  This job is run every weekday at 10am     sched configure options from ini file  sched start

User · Answer

Run the script every 15 minutes of the hour  For example  you want to receive 15 minute stock price quotes  which are updated every 15 minutes   while True      print  Update data    datetime now        sleep   15 - datetime now   minute   15     if sleep    15          run strategy           time sleep sleep   60      else          time sleep sleep   60

User · Answer

Maybe this can help  Advanced Python Scheduler  Here s a small piece of code from their documentation   from apscheduler schedulers blocking import BlockingScheduler  def some job        print  Decorated job   scheduler   BlockingScheduler   scheduler add job some job   interval   hours 1  scheduler start

User · Answer

One option is to write a C C   wrapper that executes the python script on a regular basis  Your end-user would run the C C   executable  which would remain running in the background  and periodically execute the python script  This may not be the best solution  and may not work if you don t know C C   or want to keep this 100  python  But it does seem like the most user-friendly approach  since people are used to clicking on executables  All of this assumes that python is installed on your end user s computer   Another option is to use cron job Task Scheduler but to put it in the installer as a script so your end user doesn t have to do it

User · Answer

On the version posted by sunshinekitty called  Version  lt  3 0    you may need to specify apscheduler 2 1 2    I accidentally had version 3 on my 2 7 install  so I went   pip uninstall apscheduler pip install apscheduler  2 1 2   It worked correctly after that   Hope that helps

User · Answer

For apscheduler  lt  3 0  see Unknown s answer   For apscheduler   3 0  from apscheduler schedulers blocking import BlockingScheduler  sched   BlockingScheduler     sched scheduled job  interval   seconds 10  def timed job        print  This job is run every 10 seconds      sched scheduled job  cron   day of week  mon-fri   hour 10  def scheduled job        print  This job is run every weekday at 10am     sched configure options from ini file  sched start     Update   apscheduler documentation   This for apscheduler-3 3 1 on Python 3 6 2       Following configurations are set for the scheduler    - a MongoDBJobStore named    mongo     - an SQLAlchemyJobStore named    default     using SQLite   - a ThreadPoolExecutor named    default     with a worker count of 20  - a ProcessPoolExecutor named    processpool     with a worker count of 5  - UTC as the scheduler   s timezone  - coalescing turned off for new jobs by default  - a default maximum instance limit of 3 for new jobs      from pytz import utc from apscheduler schedulers blocking import BlockingScheduler from apscheduler jobstores sqlalchemy import SQLAlchemyJobStore from apscheduler executors pool import ProcessPoolExecutor      Method 1      jobstores          mongo     type    mongodb         default   SQLAlchemyJobStore url  sqlite    jobs sqlite     executors          default     type    threadpool    max workers   20        processpool   ProcessPoolExecutor max workers 5    job defaults          coalesce   False       max instances   3        Method 2  ini format       gconfig          apscheduler jobstores mongo              type    mongodb              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    UTC      sched method1   BlockingScheduler     uses overrides from Method1 sched method2   BlockingScheduler     uses same overrides from Method2 but in an ini format    sched method1 scheduled job  interval   seconds 10  def timed job        print  This job is run every 10 seconds       sched method2 scheduled job  cron   day of week  mon-fri   hour 10  def scheduled job        print  This job is run every weekday at 10am      sched method1 configure jobstores jobstores  executors executors  job defaults job defaults  timezone utc  sched method1 start    sched method2 configure gconfig gconfig  sched method2 start

User · Answer

Probably you got the solution already  lukik  but if you wanna remove a scheduling  you should use   job   scheduler add job myfunc   interval   minutes 2  job remove     or   scheduler add job myfunc   interval   minutes 2  id  my job id   scheduler remove job  my job id     if you need to use a explicit job ID  For more information  you should check  https   apscheduler readthedocs io en stable userguide html removing-jobs

User · Answer

For scheduling task execution import schedule import time  def job        print  I m working       schedule every 1  minutes do job   schedule every   hour do job   schedule every   day at  10 30   do job   schedule every 5  to 10  minutes do job   schedule every   monday do job   schedule every   wednesday at  13 15   do job   schedule every   minute at   17   do job   while True      schedule run pending       time sleep 1

User · Answer

the simplest option I can suggest is using the schedule library   In your question  you said  I will need to run a function once every hour  the code to do this is very simple       import schedule      def thing you wanna do                                    return       schedule every   hour do thing you wanna do       while True          schedule run pending     you also asked how to do something at a certain time of the day some examples of how to do this are       import schedule       def thing you wanna do                                    return       schedule every   day at  10 30   do thing you wanna do      schedule every   monday do thing you wanna do      schedule every   wednesday at  13 15   do thing you wanna do        If you would like some randomness   variation you could also do something like this     schedule every 1  to 2  hours do thing you wanna do       while True          schedule run pending     90  of the code used is the example code of the  schedule library  Happy scheduling

User · Answer

To run something every 10 minutes past the hour     from datetime import datetime  timedelta  while 1      print  Run something         dt   datetime now     timedelta hours 1      dt   dt replace minute 10       while datetime now    lt  dt          time sleep 1

User · Answer

The Python standard library does provide sched and threading for this task  But this means your scheduler script will have be running all the time instead of leaving its execution to the OS  which may or may not be what you want

[python] Scheduling Python Script to run every hour accurately

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