GPIO sample for Raspberry Pi

pi_gpio_sample.py

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(4,GPIO.OUT)
GPIO.setup(23,GPIO.OUT)
GPIO.setup(25,GPIO.OUT)

index = 0
while True:
    time.sleep(0.1)
    GPIO.output(4,GPIO.LOW)
    GPIO.output(23,GPIO.LOW)
    GPIO.output(25,GPIO.LOW)
    index = index + 1
    if index % 3 == 0:
        GPIO.output(4,GPIO.HIGH)
    elif index % 3 == 1:
        GPIO.output(23,GPIO.HIGH)
    else:
        GPIO.output(25,GPIO.HIGH)