I'm learning how to use Python with the Raspberry Pi. I successfully followed the tutorial for how to have a Python script run on the Pi to check for new email and turn on an LED if any new messages are in an inbox. I wanted to give myself a challenge by adding a feature to blink a secondary LED to indicate the number of waiting messages. I played around for a while and got a script working, but would like to know if I implemented this correctly.
Am I using threading correctly? Is there an easier way to check a feed every n seconds, and if new messages are present, then continually run
blink() until the next feed check?
#!/user/bin/env python from threading import Thread, Event from time import sleep import feedparser import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) BLUE_LED = 17 BIG_LED = 23 GPIO.setup(BLUE_LED, GPIO.OUT) GPIO.setup(BIG_LED, GPIO.OUT) USERNAME = "firstname.lastname@example.org" PASSWORD = "gzvioCNiAvFvKoqY" class Repeat(Thread): def __init__(self,delay,function,*args,**kwargs): Thread.__init__(self) self.abort = Event() self.delay = delay self.args = args self.kwargs = kwargs self.function = function def stop(self): self.abort.set() def run(self): while not self.abort.isSet(): self.function(*self.args,**self.kwargs) self.abort.wait(self.delay) def blink(count): for x in range(0, count): print "blink", x + 1 GPIO.output(BLUE_LED, True) sleep(.25) GPIO.output(BLUE_LED, False) sleep(.25) sleep(1) #pause between blinks try: while True: print "Starting b" b = Repeat(1,blink,0) b.start() big_led = 0 print "---> ---> Checking feed" messages = int(feedparser.parse("https://" + USERNAME + ":" + PASSWORD + "@mail.google.com/gmail/feed/atom")["feed"]["fullcount"]) if messages >= 1: # turn on big LED print "Turning on Big LED" GPIO.output(BIG_LED, True) big_led = 1 print "There are", messages, "unread email messages" b = Repeat(1,blink,messages) b.start() else: print "There are no new messages" if big_led == 1: print "Turning off Big LED" GPIO.output(BIG_LED, False) sleep(60) # check the feed every minute for new mail print "Stopping b" b.stop() b.join() except (KeyboardInterrupt, SystemExit): b.stop() b.join() GPIO.cleanup() print 'Program Stopped Manually!' raise