RaspberryPi relay switch. 0 - NC, 1 - NO

switch.py

#!/usr/bin/env python

import RPi.GPIO as GPIO
import sys

PIN = 4

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN, GPIO.OUT)

def relay_off():
    GPIO.output(PIN, False)

def relay_on():
    GPIO.output(PIN, True)

def unknown():
    print 'Unknow'

switch = {'0': relay_off, '1': relay_on}
switch.get(sys.argv[1], unknown)()