code: def set_face_colors(self, colors, indexed=None):
          
          colors = _fix_colors(colors)
          if colors.shape[0] != self.n_faces:
              raise ValueError('incorrect number of colors %s, expected %s'
                               % (colors.shape[0], self.n_faces))
          if indexed is None:
              if colors.ndim != 2:
                  raise ValueError('colors must be 2D if indexed is None')
              self._face_colors = colors
              self._face_colors_indexed_by_faces = None
          elif indexed == 'faces':
              if colors.ndim != 3:
                  raise ValueError('colors must be 3D if indexed is "faces"')
              self._face_colors = None
              self._face_colors_indexed_by_faces = colors
          else:
              raise ValueError('indexed must be None or "faces"')
docs: Set the face color array
  
          Parameters
          ----------
          colors : array
              Array of colors. Must have shape (Nf, 4) (indexed by face),
              or shape (Nf, 3, 4) (face colors indexed by faces).
          indexed : str | None
              Should be 'faces' if colors are indexed by faces.