code: def start(self, seconds=300):
          
          if self.state is TimerState.stopped:
              self.compare = time.time() + abs(seconds)
              self.state = TimerState.running
          elif self.state is TimerState.running:
              self.increase(seconds)
docs: Starts timer.
          If timer is already running it will increase remaining time instead.
  
          :param int seconds: Initial time.