code: def _init_toolbar(self):
      self.message = ""
      self.cursor = 0
  
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 1 for calling the NavigationToolbar2WebAgg obj's underlying member method code with example usage: obj._init_toolbar() without return types