code: def get_vertex_colors(self, indexed=None):
          
          if indexed is None:
              return self._vertex_colors
          elif indexed == 'faces':
              if self._vertex_colors_indexed_by_faces is None:
                  self._vertex_colors_indexed_by_faces = \
                      self._vertex_colors[self.get_faces()]
              return self._vertex_colors_indexed_by_faces
          else:
              raise Exception("Invalid indexing mode. Accepts: None, 'faces'")
docs: Get vertex colors
  
          Parameters
          ----------
          indexed : str | None
              If None, return an array (Nv, 4) of vertex colors.
              If indexed=='faces', then instead return an indexed array
              (Nf, 3, 4).
  
          Returns
          -------
          colors : ndarray
              The vertex colors.