Rotate CSV from attachment

rotate.py

            atts = self.env['ir.attachment'].search([('res_model', '=', 'syscoon.financeinterface'),
                                                     ('type', '=', 'binary'),
                                                     ('res_id', '=', export_id)])
            for at in atts:
                # order lines by date asc. just revert CSV file data rows.
                data = base64.decodebytes(at.datas).decode("latin")
                stream = StringIO(data)
                dialect = csv.Sniffer().sniff(data[:5000])
                data_list = list(csv.reader(stream, dialect=dialect))
                file_path = "/var/tmp/" + at.name
                with open(file_path, 'w') as w:
                    write = csv.writer(w, delimiter=";", dialect='excel')
                    write.writerow(data_list[0])
                    write.writerow(data_list[1])
                    write.writerows(reversed(data_list[2:]))
                with open(file_path, 'rb') as r:
                    at.datas = base64.b64encode(r.read())
                os.remove(file_path)