from time import sleep
import RPi.GPIO as GPIO

GPIO.setup(13, GPIO.OUT)
GPIO.setup(15, GPIO.OUT)

while 1:
        GPIO.output(13, False)
        GPIO.output(15, True)
        print("GPIO 13 LOW, GPIO 15 HIGH | Color is BLUE")
        sleep(1)
        GPIO.output(13, True)
        GPIO.output(15, False)
        print("GPIO 13 HIGH, GPIO 15 LOW | Color is RED")
        sleep(1)