emuboy/scripts/esc-button.py

#!/usr/bin/env python

from RPi import GPIO
import time
from subprocess import call

GPIO.setmode(GPIO.BCM)
GPIO.setup(3, GPIO.IN)

pressed = False

while True:
    current = not GPIO.input(3)

    if current and not pressed:
        call(["xdotool", "keydown", "Escape"])
        pressed = True
    elif not current and pressed:
        call(["xdotool", "keyup", "Escape"])
        pressed = False

    time.sleep(0.1)