How to Gracefully Handle SIGINT Interruptions in Python?

Handling SIGINT Interruptions in Python Scripts

When working with Python scripts that execute multiple processes and database connections, a graceful exit upon receiving a SIGINT (Ctrl C) interruption is often desirable. In this instance, it becomes necessary to register a handler for SIGINT to perform necessary cleanup tasks.

Python Equivalent of Perl's SIGINT Handling

To achieve the analogue of Perl's SIGINT handling in Python, leverage the signal.signal function as follows:

import signal
import sys

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

signal.signal(signal.SIGINT, signal_handler)
print('Press Ctrl+C')
signal.pause()

Explanation

• Register the Handler: The signal.signal(signal.SIGINT, signal_handler) line assigns the signal_handler function as the designated handler for all SIGINT signals.
• Signal Handler: The signal_handler function is triggered upon receiving SIGINT. Here, it prints a message and gracefully exits the script with sys.exit(0).
• Print and Pause: After registering the handler, the script prompts the user to press Ctrl C. The signal.pause() call blocks the script until a signal is received.

Additional Resources

• [signal Module Documentation](https://docs.python.org/3/library/signal.html)

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