code: def _timer_set_interval(self):
      # Only stop and restart it if the timer has already been started
      if self._timer is not None:
          self._timer_stop()
          self._timer_start()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import datetime
  import io
  import json
  import os
  import warnings
  import numpy
  import tornado
  from matplotlib.backends import backend_agg
  from matplotlib.backend_bases import _Backend
  from matplotlib import backend_bases
  from matplotlib import _png
label_desc: Use image node_id 3 for calling the TimerTornado obj's underlying member method code with example usage: obj._timer_set_interval() without return types