Base tablib excel format modification to allow creating multiple excel tabs, in this case two tabs. Tablib library doesn't allow this out of the box

tablib.py

class ModifiedTablibFormat(TablibFormat):
    def export_data(self, dataset, **kwargs):
        return self.export_set(dataset, **kwargs)

    def export_set(self, dataset, freeze_panes=True):
        """
        Returns XLSX representation of Dataset.
        """

        wb = Workbook()
        order_sheet = wb.worksheets[0]
        order_sheet.title = 'Order list'
        order_dataset = dataset.pop(0)
        dset_sheet(order_dataset, order_sheet, freeze_panes=freeze_panes)

        customer_sheet = wb.create_sheet('Customer list')
        customer_dataset = dataset.pop()
        dset_sheet(customer_dataset, customer_sheet, freeze_panes=freeze_panes)

        stream = BytesIO()
        wb.save(stream)
        return stream.getvalue()