code: def release(self, event):
      self.canvas.remove_rubberband()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import os
  from matplotlib._pylab_helpers import Gcf
  from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase, NavigationToolbar2, TimerBase
  from matplotlib.figure import Figure
  from matplotlib import rcParams
  from matplotlib.widgets import SubplotTool
  import matplotlib
  from matplotlib.backends import _macosx
  from .backend_agg import FigureCanvasAgg
label_desc: Use image node_id 4 for calling the NavigationToolbar2Mac obj's underlying member method code with example usage: obj.release(event) without return types