Using RPi to control LED traffic lights, iterate through each individually, then flash all twice. Keep loopin!

traffic_lights.py

import RPi.GPIO as gpio
import time

gpio.setmode(gpio.BCM)
gpio.setup(5, gpio.OUT)
gpio.setup(6, gpio.OUT)
gpio.setup(13, gpio.OUT)


def main():
    try:
        while True:
            # iterate through traffic lights then flash
            gpio.output(5, gpio.HIGH)
            time.sleep(2)
            gpio.output(5, gpio.LOW)
            gpio.output(6, gpio.HIGH)
            time.sleep(2)
            gpio.output(6, gpio.LOW)
            gpio.output(13, gpio.HIGH)
            time.sleep(2)
            gpio.output(13, gpio.LOW)
            time.sleep(1)
            gpio.output(5, gpio.HIGH)
            gpio.output(6, gpio.HIGH)
            gpio.output(13, gpio.HIGH)
            time.sleep(1)
            gpio.output(5, gpio.LOW)
            gpio.output(6, gpio.LOW)
            gpio.output(13, gpio.LOW)
            time.sleep(1)
            gpio.output(5, gpio.HIGH)
            gpio.output(6, gpio.HIGH)
            gpio.output(13, gpio.HIGH)
            time.sleep(1)
            gpio.output(5, gpio.LOW)
            gpio.output(6, gpio.LOW)
            gpio.output(13, gpio.LOW)
            time.sleep(2)

    finally:
        gpio.cleanup()


main()