作者：吴业亮
博客：wuyeliang.blog.csdn.net

代码

#! /usr/bin/env python3
# -*- coding:UTF-8 -*-
#                       LED                            Pi 
#                       GND ------------------ GND
#                       R   ------------------ Pin 37
#                       G       ------------------ pin 35
#                       B   ------------------ pin 33
#
#---------------------------------------------------
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
RGlist = [33,35,37]
GPIO.setup(RGlist,GPIO.OUT)


if __name__ == '__main__':
    try:
        while True:
            for i in RGlist:
                GPIO.output(i,1)
                time.sleep(0.5)
                GPIO.output(i,0)
    except KeyboardInterrupt:
        GPIO.cleanup()

实现效果