basic timer

timer.py

class Timer:
    def __init__(self, delay, fn):
        self.delay = delay
        self.fn = fn
        self.last_updated = datetime.datetime.now()

    def tick(self):
        now = datetime.datetime.now()
        diff = now - self.last_updated
        milliseconds = (diff.days * 24 * 60 * 60 + diff.seconds) * 1000 + diff.microseconds / 1000.0
        if milliseconds >= self.delay:
            self.fn()
            self.last_updated = datetime.datetime.now()


if __name__ == '__main__':
    def print_hi():
        print('hi')
        
    print_timer = Timer(5000, print_hi)
    while True:
        print_timer.tick()