How to Handle the RuntimeError When Re-starting a `threading.Timer` Object in Python?

Threading.Timer: Repeating a Function at Specified Intervals

Python's threading.Timer module provides a convenient way to schedule functions to run at specified intervals. However, users may encounter challenges when attempting to control the execution of these timers.

One common issue is the RuntimeError that occurs when re-starting a timer. The reason for this is that the threading.Timer object can only be started once. To address this, it is recommended to create a separate thread that manages the timer instead of re-starting the same timer multiple times.

Here's an example of how to implement this approach:

import threading
import time

def my_function():
    print("Function called")

# Create an event to signal when the thread should stop
stop_event = threading.Event()

# Define a thread class that runs the timer
class TimerThread(threading.Thread):
    def run(self):
        while not stop_event.is_set():
            # Execute the function at specified intervals
            time.sleep(0.5)
            my_function()

# Create and start the timer thread
timer_thread = TimerThread()
timer_thread.start()

# Pause the timer by setting the stop_event
time.sleep(5)
stop_event.set()

# Wait for the thread to finish
timer_thread.join()

In this example, the TimerThread is started once and runs indefinitely, with the timer logic encapsulated within the run() method. To control the timer, the stop_event can be set to signal the thread to stop running. This approach provides better control over the timer and avoids the RuntimeError associated with re-starting the timer object.

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