code: def _get_agg_font(self, prop):
          
          if __debug__: verbose.report('RendererAgg._get_agg_font',
                                       'debug-annoying')
  
          key = hash(prop)
          font = RendererAgg._fontd.get(key)
  
          if font is None:
              fname = findfont(prop)
              font = RendererAgg._fontd.get(fname)
              if font is None:
                  font = FT2Font(
                      str(fname),
                      hinting_factor=rcParams['text.hinting_factor'])
                  RendererAgg._fontd[fname] = font
              RendererAgg._fontd[key] = font
  
          font.clear()
          size = prop.get_size_in_points()
          font.set_size(size, self.dpi)
  
          return font
docs: Get the font for text instance t, cacheing for efficiency