code: def _init_glyph(self, plot, mapping, properties, key):
          
          properties = mpl_to_bokeh(properties)
          plot_method = '_'.join(key.split('_')[:-1])
          renderer = getattr(plot, plot_method)(**dict(properties, **mapping))
          return renderer, renderer.glyph
docs: Returns a Bokeh glyph object.