code: def _renderer(self):
      # In theory, _renderer should be set in __init__, but GUI canvas
      # subclasses (FigureCanvasFooCairo) don't always interact well with
      # multiple inheritance (FigureCanvasFoo inits but doesn't super-init
      # FigureCanvasCairo), so initialize it in the getter instead.
      if not hasattr(self, "_cached_renderer"):
          self._cached_renderer = RendererCairo(self.figure.dpi)
      return self._cached_renderer
  
imports: import functools
  import gzip
  import math
  import numpy
  from ..None import _api, cbook, font_manager
  from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase, RendererBase
  from matplotlib.font_manager import ttfFontProperty
  from matplotlib.path import Path
  from matplotlib.transforms import Affine2D
label_desc: Use image node_id 1 for calling the FigureCanvasCairo obj's underlying member method code with example usage: obj._renderer() and returns: self