code: def face_colors(self, values):
          
          if values is None:
              if 'face_colors' in self._data:
                  self._data.data.pop('face_colors')
              return
  
          colors = to_rgba(values)
  
          if (self.mesh is not None and
                  colors.shape == (4,)):
              count = len(self.mesh.faces)
              colors = np.tile(colors, (count, 1))
  
          # if we set any color information, clear the others
          self._data.clear()
          self._data['face_colors'] = colors
          self._cache.verify()
docs: Set the colors for each face of a mesh.
  
          This will apply these colors and delete any previously specified
          color information.
  
          Parameters
          ------------
          colors: (len(mesh.faces), 3), set each face to the specified color
                  (len(mesh.faces), 4), set each face to the specified color
                  (3,) int, set the whole mesh this color
                  (4,) int, set the whole mesh this color