An internal helper for the representation methods

def _get_attrs(self):
        """An internal helper for the representation methods"""
        attrs = []
        attrs.append(("N Cells", self.GetNumberOfCells(), "{}"))
        attrs.append(("N Points", self.GetNumberOfPoints(), "{}"))
        bds = self.bounds
        attrs.append(("X Bounds", (bds[0], bds[1]), "{:.3e}, {:.3e}"))
        attrs.append(("Y Bounds", (bds[2], bds[3]), "{:.3e}, {:.3e}"))
        attrs.append(("Z Bounds", (bds[4], bds[5]), "{:.3e}, {:.3e}"))
        # if self.n_cells <= vtki.REPR_VOLUME_MAX_CELLS and self.n_cells > 0:
        #     attrs.append(("Volume", (self.volume), "{:.3e}"))
        return attrs