Python Scheduler

#python #schedule #tutorial #beginners

A scheduler

is used to run the function periodically using different types of patterns and syntaxes. Normally, if a task has to be performed every time after a specific time difference, a scheduler can be used.

Suppose you have a report which needs to be generated at 10 AM daily, this process can be triggered using a scheduled program.

Python has a “schedule” library that can help you perform this scheduling using very friendly syntaxes.

Official documentation of this library is available at https://schedule.readthedocs.io/en/stable/

To use this library you will need to install it using

pip install schedule

Now you are ready to schedule the jobs.

Let's try a simple example

import schedule
import time

# This method is the actual processing that we want to accomplish
# with every scheduled execution
def job():
    print("Job ran")

# This defines the frequency to run the program
schedule.every().hour.do(job)

# while loop to keep the program running in the memory
while True:
        # it will check if any execution is pending, 
        # if yes it will start execution
    schedule.run_pending()

        # program will sleep for 1 second and then will again start while loop
    time.sleep(1)

The above program will run every hour and print the line “Job ran”.

Let's look at some more examples to schedule job syntaxes

Scheudled job with frequency

# Run job every 15 seconds
schedule.every(15).seconds.do(job)

# Run job every 15 minutes
schedule.every(32).minutes.do(job)

# Run job every 12 hours
schedule.every(12).hours.do(job)

# Run job every 5 days
schedule.every(5).days.do(job)

# Run job every 2 weeks
schedule.every(2).weeks.do(job)

Scheduled job for specific time

# Run job every minute at the 45th second
schedule.every().minute.at(":45").do(job)

# Run job every hour at the 10th minute
schedule.every().hour.at(":10").do(job)

# Run job every day at specific time

# Everyday at 11 Hour 11 Minutes
schedule.every().day.at("11:11").do(job)

# Everyday at 11 Hour 11 Minutes 11 Second
schedule.every().day.at("11:11:11").do(job)

Checkout the working demo at
https://replit.com/@AshutoshSharm35/Python-Scheduler-Demo?v=1