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from threading import Timer

class IntervalTimer(object):
    """ run functions on intervals in the background
        by: Cody Kochmann
    """
    def __init__(self, seconds, function):
        assert type(seconds) in (int,float)
        assert callable(function)
        self.seconds=seconds
        self.function=function
        self.stopped=False
        self.running=False

    def start(self):
        if not self.stopped:
            if not self.running:
                self.function()
                self.running=True
            self.thread=Timer(self.seconds,self.function)
            self.thread.start()
            self.restart_thread=Timer(self.seconds, self.start)
            self.restart_thread.start()

    def stop(self):
        try:
            self.stopped = True
            self.running = False
            self.thread.cancel()
            self.restart_thread.cancel()
        except AttributeError:
            pass

if __name__ == '__main__':
    def hi():
        print 'hi'

    i=IntervalTimer(2, hi)
    i.start()

    from time import sleep
    sleep(8)
    i.stop()