How Can I Implement Cron-Like Scheduling in Python Without External Dependencies?

Finding the Perfect Cron-Like Scheduler in Python

Implementing scheduled tasks without relying on external cron installations can be a challenge. This article explores the options available to achieve this in Python.

Introducing Schedule

For pure Python solutions, the "schedule" library stands out. It provides an intuitive syntax for defining cron-like expressions. Here's an example:

import schedule
import time

def job():
    print("I'm working...")

schedule.every(10).minutes.do(job)  # Every 10 minutes
schedule.every().hour.do(job)  # Every hour
schedule.every().day.at("10:30").do(job)  # At 10:30 AM every day

while 1:
    schedule.run_pending()
    time.sleep(1)

Flexibility and Customization

Schedule offers the flexibility of cron expressions, allowing you to create complex schedules. It supports various time units such as minutes, hours, days, and weeks.

Running Python Functions as Jobs

Note that while schedule cannot launch external processes, it can handle Python functions as jobs. This allows you to schedule tasks running within your Python program.

Conclusion

For those seeking a lightweight and portable cron alternative in Python, the "schedule" library is an ideal solution. It provides the expressivity and flexibility needed for creating scheduled tasks.

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