code: def draw_rubberband(self, event, x0, y0, x1, y1):
      self.canvas.send_event("rubberband", x0=x0, y0=y0, x1=x1, y1=y1)
  
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 4 for calling the NavigationToolbar2WebAgg obj's underlying member method code with example usage: obj.draw_rubberband(event, x0, y0, x1, y1) without return types