i) Creates a small number of Product instances that may be purchased

ii) Accepts simulated 'scanning' of a Product to identify it (including refusal to identify products which do not exist)

iii) Adds a scanned Product to the CheckoutRegister's list of products being purchased

iv) Allows the checkout of multiple products

v) Accepts 'virtual money' to pay for those products (you must pay enough to cover the cost of the items checked out)

vi) Prints a final receipt of the products purchased, along with the total cost, total paid and any change given.

class Product:

  def __init__(self, name, price, barcode, description):

    self.name = name

    self.price = price

    self.barcode = barcode

    self.description = description

class CheckoutRegister:

  def __init__(self):

    self.total_cost = 0

    self.items_scanned = []

    self.amount_paid = 0

  def accept_payment(self, some_amount):

    self.amount_paid += some_amount

  def scan_item(self, some_product):

    self.items_scanned.append(some_product)

    self.total_cost += some_product.price

  def print_receipt(self):

    print("----- Final Receipt -----")

    for item in self.items_scanned:

      print(f"{item.name} ${item.price:.2f}")

    print(" Total amount due: ${:.2f}".format(self.total_cost))

    print("Amount received: ${:.2f}".format(self.amount_paid))

    print("Change given: ${:.2f}".format(self.amount_paid - self.total_cost))

    print(" Thank you for shopping at FedUni!")

from product import Product

from checkoutregister import CheckoutRegister

def main():

  print("----- Welcome to FedUni checkout! -----")

  # Create instances of Product and CheckoutRegister

  product1 = Product("Milk, 2 Litres", 2.0, "123", "Dairy product")

  product2 = Product("Bread", 3.5, "456", "Bakery product")

  checkout = CheckoutRegister()

  while True:

    barcode = input("Please enter the barcode of your item: ").strip()

    # Check if the barcode exists in your predefined products

    if barcode == product1.barcode:

      checkout.scan_item(product1)

    elif barcode == product2.barcode:

      checkout.scan_item(product2)

    else:

      print("This product does not exist in our inventory.")

    another_product = input("Would you like to scan another product? (Y/N) ").strip().lower()

    if another_product != 'y':

      break

  # Calculate the total cost and prompt for payment

  print(" Payment due: ${:.2f}".format(checkout.total_cost))

  while True:

    payment = float(input("Please enter an amount to pay: "))

    if payment < 0:

      print("We don't accept negative money!")

    else:

      break

  checkout.accept_payment(payment)

  # Display receipt

  checkout.print_receipt()

  next_customer = input("(N)ext customer, or (Q)uit? ").strip().lower()

  if next_customer != 'n':

    main()

if __name__ == "__main__":

  main()

Example Program Output Welcome to FedUni checkout! Please enter the barcode of your item: 123 Milk, 2 Litres - $2.0 Would you like to scan another product? (Y/N) Y Please enter the barcode of your item: 456 Bread - $3.5 Would you like to scan another product? (Y/N) Y Please enter the barcode of your item: 999 This product does not exist in our inventory. Would you like to scan another product? (Y/N) n Payment due: $5.5. Please enter an amount to pay: 5 Payment due: $0.5. Please enter an amount to pay: -3 We don't accept negative money!