RPi GPIO interrupt handling

edgetest.py

#!/usr/bin/env python3

import RPi.GPIO as GPIO
import asyncio
import sys

PIN = 18

def handle_edge(pin):
    print('Edge callback')

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    try:
        GPIO.setmode(GPIO.BCM)
        GPIO.setup(PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
        GPIO.add_event_detect(PIN, GPIO.RISING, callback=handle_edge, bouncetime=500)
        loop.run_forever()
    except KeyboardInterrupt:
        loop.close()
        sys.exit()