now excel is working

main.py

@@ -78,12 +78,19 @@ if __name__ == '__main__':
                         help='The name of the requested chain',
                         choices=chain_dict.keys(),
                         )
+    parser.add_argument('--type',
+                        choices=("excel", "csv"),
+                        default='excel',
+                        
+        help="a switch flag to set set the output file to a CSV file",
+        required=False,
+                        )
     args = parser.parse_args()
-
+    file_type = '.xlsx' if not args.type or args.type == 'excel' else '.csv'
     chain: SupermarketChain = chain_dict[args.chain]
     if args.promos:
         arg_store_id = int(args.promos[0])
-        main_latest_promos(store_id=arg_store_id, load_xml=args.load_prices, chain=chain, load_promos=args.load_promos)
+        main_latest_promos(store_id=arg_store_id, load_xml=args.load_prices, chain=chain, load_promos=args.load_promos, file_type=file_type)
 
     elif args.price:
         get_products_prices(chain, store_id=args.price[0], load_xml=args.load_prices, product_name=args.price[1])