How to Repeatedly Execute a Python Function Without a Cron Job or Resource Exhaustion?

How to Execute a Function Repeatedly Without Cron

Python enthusiasts often face the challenge of perpetually executing a function at specified intervals without the need for complex cron setups. One straightforward approach involves utilizing a simple while loop.

while True:
    # Code executed here
    time.sleep(60)

This code appears to serve the purpose of continuously executing a function every 60 seconds. However, potential pitfalls exist within this approach. As the loop keeps running endlessly, there's a risk of resource exhaustion, causing sluggish performance or system crashes.

To gracefully resolve these issues, consider employing an event scheduler such as the sched module in Python.

import sched, time

def do_something(scheduler):
    # schedule the next call first
    scheduler.enter(60, 1, do_something, (scheduler,))
    print("Doing stuff...")
    # then do your stuff

my_scheduler = sched.scheduler(time.time, time.sleep)
my_scheduler.enter(60, 1, do_something, (my_scheduler,))
my_scheduler.run()

The sched module enables the scheduling of tasks with intricate control over their execution times. In this scenario, do_something() functions as a callback function that reschedules itself every 60 seconds and simultaneously performs the intended task. This mechanism ensures continuous execution of the function at the specified interval without obstructing the program's responsiveness.

In essence, leveraging event schedulers provides a more robust and resource-efficient solution for repeatedly executing functions in Python without the limitations of while loops.

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