code: def __init__(self, dpi):
      self.dpi = dpi
      self.gc = GraphicsContextCairo(renderer=self)
      self.text_ctx = cairo.Context(
          cairo.ImageSurface(cairo.FORMAT_ARGB32, 1, 1)
      )
      self.mathtext_parser = MathTextParser("Cairo")
      RendererBase.__init__(self)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import gzip
  import sys
  import warnings
  import numpy
  from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase, RendererBase
  from matplotlib.mathtext import MathTextParser
  from matplotlib.path import Path
  from matplotlib.transforms import Affine2D
  from matplotlib.font_manager import ttfFontProperty
label_desc: Use image node_id 1 to create a new RendererCairo object from inherited base classes: RendererBase with example: obj = RendererCairo(dpi)