<prompt> Kujenga muundo wa data kuwakilisha duka duka checkout mfumo.  <response>: A grocery store checkout system can be represented using object-oriented programming. Here is an example of the data structure for an object in Python:class Product: def __init__self, name, price, barcode, quantity: self.name name self.price price self.barcode barcode self.quantity quantityclass ItemProduct: def __init__self, name, price, barcode, quantity, weight0: super.__init__name, price, barcode, quantity self.weight weightclass Cart: def __init__self: self.items def add_itemself, item: self.items.appenditem def remove_itemself, item: self.items.removeitem def get_total_priceself: total 0 for item in self.items: if item.weight 0 : total item.price item.quantity else: total item.price item.weight return totalclass Checkout: def __init__self: self.cart Cart def scan_itemself, item: self.cart.add_itemitem def remove_itemself, item: self.cart.remove_itemitem def get_totalself: return self.cart.get_total_price def payself, amount: total self.get_total if amount total: change amount-total self.cart Cart; return change else: return -1This data structure comprises of four main classes: Product, Item, Cart, and Checkout. The Product class contains attributes for the name, price, and barcode of the product, and quantity of the product.The Item class is a subclass of Product, which also inherits the properties of the Product class. Furthermore, it contains an additional attribute, weight, to account for items sold by weight.The Cart class is used to hold items, remove items, and compute the total price of all goods. The Checkout class is used to model the checkout system. It contains a Cart object and methods to scan items, remove items, compute the total price, and enable payment. 