code: def _tick(self):
      if time() >= self._next_time:
          self._vispy_timer._timeout()
          self._next_time = time() + self._interval
  
imports: from __future__ import division
  import atexit
  from time import sleep
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 4 for calling the TimerBackend obj's underlying member method code with example usage: obj._tick() without return types