code: def _get_canvas(self, fig):
      return FigureCanvasGTKCairo(fig)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import gtk
  from matplotlib import cbook
  from matplotlib.backends import backend_cairo
  from matplotlib.backends.backend_gtk import *
  from matplotlib.backends.backend_gtk import _BackendGTK
label_desc: Use image node_id 1 for calling the NavigationToolbar2Cairo obj's underlying member method code with example usage: obj._get_canvas(fig) and returns: FigureCanvasGTKCairo