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In this task, you'll be building a system to assist a cashier where the cashier has to enter the items bought and at the end, a receipt will be printed.

Item (enter "done" when finished): apples
Price: .2
Quantity: 4
Item (enter "done" when finished): carrot
Price: .1
Quantity: 1
Item (enter "done" when finished): flour
Price: 1.3
Quantity: 2
Item (enter "done" when finished): water bottles
Price: .05
Quantity: 10
Item (enter "done" when finished): done

-------------------
receipt
-------------------
4 apples 0.800KD
1 carrot 0.100KD
2 flour 2.600KD
10 water bottles 0.500KD
-------------------
Total Price: 4.000KD

1. In the get_invoice_items function:

   1. Create a list called invoice_items.

   2. Loop through the items received in the parameter and format them in the following way: quantity name subtotal currency. Here is an example of items that this function might receive:

      [
      {'name': 'Apple', 'quantity': 1, price: 0.2 },
      {'name': 'Orange', 'quantity': 4, price: 0.3 },
      ]

   3. Add each formatted item to your invoice_items list.

   4. Return your invoice_items list after looping through all the items.

2. In the get_total function:
   1. Initialize the total to be 0.
   2. Loop through all the items, calculate the subtotal (quantity * price) for each item and add that to your total.
   3. Return your total after looping through all the items.
3. In the print_receipt function, you will receive invoice_items from get_invoice_items and the total from get_total:
   1. Print out a title (e.g., Receipt).
   2. Print all the formatted invoice line items on separate lines.
   3. Print out the total price at the end.
4. In the main function:

   1. Create a list called items, you will be adding the items received from the user to this list.

   2. Ask the user to input an item name, and inform him to input done once he finishes. Assign the input to a variable called item_name.

   3. Add a while loop that checks the user's input. The loop ends if the user types "done" for the item name. Otherwise, the user will be asked for two more inputs: price and quantity.

   4. Save the user's input (the item's name, price, quantity) in a dictionary. Append this dictionary to a list of items in Step 1. This list of items is a list of dictionaries, where each dictionary represents an item.

      • In the example above, the list of items looks like this:

        [
            {
                "name": "apples",
                "price": .2,
                "quantity": 4
            },
            {
                "name": "carrot",
                "price": .1,
                "quantity": 1 
            },
            {
                "name": "flour",
                "price": 1.3,
                "quantity": 2
            },
            {
                "name": "water bottles",
                "price": .05,
                "quantity": 10
            },
        ]

   5. Get the invoice items and total using the functions you have added above.

   6. Use the print_receipt function and pass invoice items and total to it, to show the user's receipt.

5. Push your code.