How Can I Execute a Python Function Periodically?

Executing a Function Periodically in Python

When tasked with executing a function repeatedly at fixed intervals, developers often seek a reliable method similar to Objective C's NSTimer or JavaScript's setTimeout. In this context, a solution that resembles a user-independent cron script emerges as an attractive option.

To achieve this in Python, one might consider the following approach:

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

However, this code may present unforeseen issues. To circumvent these, consider utilizing the sched module, a general-purpose event scheduler. The following example demonstrates its usage:

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()

Alternatively, if your application employs an event loop library like asyncio, trio, tkinter, or others, you can directly schedule tasks using their provided methods.

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