code: def resume():
      
      t = timer()
      if f.t.stopped:
          raise StoppedError("Cannot resume stopped timer.")
      if not f.t.paused:
          raise PausedError("Cannot resume timer that is not paused.")
      f.t.paused = False
      f.t.start_t = t
      f.t.last_t = t
      return t
docs: Resume a paused timer, re-activating it.  Subsequent time accumulates in
      the total.
  
      Returns:
          float: The current time.
  
      Raises:
          PausedError: If timer was not in paused state.
          StoppedError: If timer was already stopped.