import time
import sys
import os
import RPi.GPIO as GPIO

red_light = 13 ##GPIO 13 connect to IN3
yellow_light = 16 ##GPIO 16 connect to IN2
green_light = 7 ##GPIO 7 connect to IN1

GPIO.setmode(GPIO.BOARD)
GPIO.setup(green_light, GPIO.OUT)
GPIO.setup(red_light, GPIO.OUT)
GPIO.setup(yellow_light, GPIO.OUT)

GPIO.output(red_light,True)
GPIO.output(yellow_light,True)
GPIO.output(green_light,True)

def LightsReady(numTimes, speed):
	for i in range(0,numTimes):## Run loop numTimes
		print "Iteration " + str(i+1)## Print current loop
		GPIO.output(green_light,False)## Switch on pin 7
		GPIO.output(yellow_light,False)## Switch on pin 15
		GPIO.output(red_light,False)## Switch on pin 13
		time.sleep(speed)## Wait
		GPIO.output(green_light,True)## Switch off pin 7
		GPIO.output(yellow_light,True)## Switch off pin 15
		GPIO.output(red_light,True)## Switch off pin 13
	print "Done" ## When loop is complete, print "Done"
	##GPIO.cleanup()

LightsReady(3,.2)