How to exit the entire application from a Python thread

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Exiting an entire Python application from a thread can be a bit tricky because calling sys.exit() or raising a SystemExit exception from within a thread will only terminate that thread, not the entire application. To exit the entire application from a thread, you should use a combination of techniques. Below is a step-by-step tutorial with code examples to help you achieve this:
Step 1: Create a Python Thread
First, you need to create a Python thread where you want to initiate the application exit. You can use the threading module for this purpose.
Step 2: Define an Exit Function
Inside the exit_application function, you can include your application exit logic. For example, you might want to gracefully shut down resources, save data, and then initiate the application exit.
Step 3: Start the Exit Thread
Before starting the thread, you may want to set it as a daemon thread. Daemon threads are threads that will exit when the main program finishes. This is a safety measure to ensure that the exit thread doesn't keep the application running if the main thread terminates.
Step 4: Trigger the Exit Thread
Now, you can trigger the exit thread to initiate the application exit from your main program or other threads when the exit condition is met.
For example, you can set up a signal handler, listen for a specific event, or use a flag to signal the exit thread to run. Here's an example using a KeyboardInterrupt (Ctrl+C) signal:
In this example, when you press Ctrl+C, the KeyboardInterrupt exception is caught, and the exit thread is triggered, which in turn calls sys.exit(0) to exit the entire application gracefully.
By following these steps, you can initiate the exit of the entire Python application from a thread while allowing for proper cleanup and resource management.
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