How Can I Gracefully Handle Ctrl C Interrupts in My Python Scripts?

Handling SIGINT in Python: A Detailed Guide

When working with Python scripts that include multiple processes and database connections, it's crucial to be able to gracefully handle user interruptions, such as the SIGINT signal generated when the user presses Ctrl C. This article provides a comprehensive guide to capturing and responding to SIGINT in Python, allowing you to perform necessary cleanup before exiting the script.

Implementing the SIGINT Handler

To register your handler for the SIGINT signal, you can utilize the signal.signal function in Python. Here's an example code snippet:

import signal
import sys

def signal_handler(sig, frame):
    print('You pressed Ctrl+C!')
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)

In this code, we:

1. Import the necessary modules: signal and sys.
2. Define a signal handler function (signal_handler) that prints a message and terminates the script gracefully.
3. Register the signal handler for the SIGINT signal using signal.signal.

Capturing the SIGINT Signal

Once the signal handler is registered, you can capture the SIGINT signal by calling signal.pause(). This function will block the script until a signal is received, which in this case would be the Ctrl C input.

print('Press Ctrl+C')
signal.pause()

Additional Notes

• The code provided is a basic example that prints a message and exits the script. You can modify the signal handler function to perform any necessary cleanup or finalization before exiting.
• More detailed documentation on the signal module and signal handling in Python can be found in the Python standard library documentation.

The above is the detailed content of How Can I Gracefully Handle Ctrl C Interrupts in My Python Scripts?. For more information, please follow other related articles on the PHP Chinese website!