code: def get_face_colors(self, indexed=None):
          
          if indexed is None:
              return self._face_colors
          elif indexed == 'faces':
              if (self._face_colors_indexed_by_faces is None and
                      self._face_colors is not None):
                  Nf = self._face_colors.shape[0]
                  self._face_colors_indexed_by_faces = \
                      np.empty((Nf, 3, 4), dtype=self._face_colors.dtype)
                  self._face_colors_indexed_by_faces[:] = \
                      self._face_colors.reshape(Nf, 1, 4)
              return self._face_colors_indexed_by_faces
          else:
              raise Exception("Invalid indexing mode. Accepts: None, 'faces'")
docs: Get the face colors
  
          Parameters
          ----------
          indexed : str | None
              If indexed is None, return (Nf, 4) array of face colors.
              If indexed=='faces', then instead return an indexed array
              (Nf, 3, 4)  (note this is just the same array with each color
              repeated three times).
          
          Returns
          -------
          colors : ndarray
              The colors.