using python (pandas for the database and gradio for the inteface), create a system for shopping; the methods should include: 
-add item, delete item, replace item, save item, de/select item, edit item quantity, undo action
-filter items/sort items by: item description/price/ratings/reviews/delivery method (delivey/in store pickup)
 Provide two versions of response separated with exactly 6 asterisk symbols: ******.
user