python多线程并发让两个LED同时亮的方法

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
import RPi.GPIO as GPIO
import threading
import time
 
class led_blue(threading.Thread): #继承父类threading.Thread
 def __init__(self, threadID, name, counter):
  threading.Thread.__init__(self)
  self.threadID = threadID
  self.name = name
  self.counter = counter
 def run(self):     #把要执行的代码写到run函数里面 线程在创建后会直接运行run函数
  print "Starting " + self.name
  led_blue_on()
  print "Exiting " + self.name
 
class led_red (threading.Thread): #继承父类threading.Thread
 def __init__(self, threadID, name, counter):
  threading.Thread.__init__(self)
  self.threadID = threadID
  self.name = name
  self.counter = counter
 def run(self):     #把要执行的代码写到run函数里面 线程在创建后会直接运行run函数
  print "Starting " + self.name
  led_red_on()
  print "Exiting " + self.name
 
def led_blue_on():
 PIN_NO=13
 GPIO.setmode(GPIO.BOARD)
 GPIO.setup(PIN_NO, GPIO.OUT)
 GPIO.output(PIN_NO,GPIO.HIGH)
	
def led_red_on():
 PIN=12
 GPIO.setmode(GPIO.BOARD)
 GPIO.setup(PIN, GPIO.OUT)
 GPIO.output(PIN,GPIO.HIGH)
 
# 创建新线程
thread1 = led_blue(1, "light_blue_on_on", 1)
thread2 = led_red(2, "light_red_on", 2)
 
# 开启线程
thread1.start()
thread2.start()
 
print "Exiting Main Thread"
time.sleep(20)
GPIO.cleanup()