suggested excercise #2 http://krondo.com/blog/?p=1333, trying to get how this code can be more simple

gistfile1.txt

twisted_exercise.py

from twisted.internet.task import LoopingCall
class Countdown(object):
    loops = 0
    counters = 0 
    def __init__(self,count_to=None):
        
        self.counter = count_to
        self.loop_call = None

        Countdown.loops += 1
        # just to identify counters
        Countdown.counters += 1 
        if _id is not None:
            self._id = _id
        else:
            self._id = Countdown.counters

    def count(self):
        # if we done with counting
        if not self.counter:
            # decrease loop_calls counter
            Countdown.loops -=1
            # also stop reactor, if no loops left
            if not Countdown.loops:
                reactor.stop()
            # stop current loop call
            self.loop_call.stop()
            
        elif self.counter:
            print self._id,':', self.counter
            self.counter -= 1




from twisted.internet import reactor

print 'Start!'

cnt3 = Countdown(8)
cnt3.loop_call = LoopingCall(cnt3.count).start(1)

cnt2 = Countdown(10)
cnt2.loop_call = LoopingCall(cnt2.count).start(0.5)

cnt1 = Countdown(5)
cnt1.loop_call = LoopingCall(cnt1.count).start(1.5)

reactor.run()

print 'Stop!'