点亮LED

#!/usr/bin/python3 
#encoding=utf-8

from GPIO import * 
import time

class Led(object): 
    def __init__(self, index): 
        self.__led = GPIO(index) 
        self.__status = False

    def on (self): 
        self.__led.high() 
        self.__status = True

    def off(self): 
        self.__led.low() 
        self.__status = False

    def get_status(self): 
        return self.__status;

def main(): 
    GPIO.init(GPIO.BCM)

    io = [12, 16, 20, 21] 
    leds = list()

    for i in io: 
        leds.append(Led(i))

    index = 0 
    while index < 20000: 
        for led in leds: 
            led.on() 
            time.sleep(1) 
            led.off()

        index += 1

    GPIO.cleanup()

if '__main__' == __name__: 
main()