Updates shape in code_array

def _xls2shape(self):
        """Updates shape in code_array"""

        sheets = self.workbook.sheets()
        nrows = 1
        ncols = 1
        for sheet in sheets:
            nrows = max(nrows, sheet.nrows)
            ncols = max(ncols, sheet.ncols)
        ntabs = len(sheets)

        self.code_array.shape = nrows, ncols, ntabs