rasp_simple_led.py

import RPi.GPIO as gpio

gpio.setmode(gpio.BCM)
gpio.setup(4, gpio.OUT)

def toggle_led():
    status = gpio.input(4)
    if status == 0:
        gpio.output(4, True)
    else:
        gpio.output(4, False)

while True:
    key = raw_input()
    if key == 'q':
        gpio.cleanup()
        exit(0)

    toggle_led()