How to kill a thread in python?

In Python, you cannot directly kill a thread using built-in methods because it can lead to unpredictable behavior and resource leaks. However, you can stop a thread by setting a flag or condition that the thread checks periodically.

Kill a thread in Python

import threading import time # Define a thread function def worker(): while not exit_flag.is_set(): print("Thread is working...") time.sleep(1) # Create an exit flag exit_flag = threading.Event() # Create and start the thread thread = threading.Thread(target=worker) thread.start() # Let the thread run for a few seconds time.sleep(5) # Set the exit flag to signal the thread to stop exit_flag.set() # Wait for the thread to finish thread.join() print("Thread has been stopped.")

In this example, the exit_flag is used to signal the thread to stop. The worker function checks the exit_flag in its loop condition, and when the flag is set, the thread will exit elegantly.

Remember that forcibly killing a thread can lead to resource leaks and instability. It's better to design your code to allow threads to exit naturally when their work is done or using signals like in the example above.


It's not recommended to directly kill threads due to potential resource leaks and instability. Instead, threads should be stopped by using flags or conditions that the thread checks periodically. Setting an exit flag or condition and letting the thread finish its work before exiting is a safer approach.