code: def __init__(self, figure):
      backend_gtk3.FigureCanvasGTK3.__init__(self, figure)
      self._bbox_queue = []
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import numpy
  import warnings
  from .None import backend_agg, backend_gtk3
  from .backend_cairo import cairo, HAS_CAIRO_CFFI
  from .backend_gtk3 import _BackendGTK3
  from matplotlib import transforms
label_desc: Use image node_id 1 to create a new FigureCanvasGTK3Agg object from inherited base classes: backend_gtk3, backend_agg with example: obj = FigureCanvasGTK3Agg(figure)