How to use the flattentool.ODSReader.GrowingList function in flattentool

def readSheet(self, sheet):
        name = sheet.getAttribute("name")
        rows = sheet.getElementsByType(TableRow)
        arrRows = []

        # for each row
        for row in rows:
            row_comment = ""  # noqa
            arrCells = GrowingList()
            cells = row.getElementsByType(TableCell)

            # for each cell
            count = 0
            for cell in cells:
                # repeated value?
                repeat = cell.getAttribute("numbercolumnsrepeated")
                if not repeat:
                    repeat = 1
                    spanned = int(cell.getAttribute("numbercolumnsspanned") or 0)
                    # clone spanned cells
                    if self.clonespannedcolumns is not None and spanned > 1:
                        repeat = spanned

                for rr in range(int(repeat)):  # repeated?
                    if str(cell):