p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Calibri; min-height: 14.0px} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Calibri} p.p3 {margin: 0.0px 0.0px 15.8px 0.0px; font: 11.5px...

You are tasked with creating a text-based program for simulating a
supermarket self-service checkout
using the Python 3 programming language.

The assignment is broken up into four main components:

1.) Design and model two classes:
Product
and
CheckoutRegister,

2.) Create an
activity chart
which describes the behaviour of the checkout system,

3.) Create a
computer program
that allows a user to interactively check out a number of products, then provides an

opportunity to enter some virtual money to pay for the products and finally and prints out a receipt for the user (to the screen, not on paper), and finally

4.) Explain and integrate some code into your checkout program that places the products purchased into virtual shopping bags.

Your submission should consist of one Microsoft Word or LibreOffice document containing the first two parts of the assignment, and three Python scripts that implement the computer program (checkoutregister.py, product.py
and
main.py).

The
main.py
script runs the main logic of the program and will use instances of the
CheckoutRegister
and
Product
classes to simulate checking out of the supermarket.

You are provided with a Microsoft Word template to help you complete the first two parts of this assignment.

Towards the end of this document you will also be provided with the output of a simulated run of the completed computer program which may help you with this assignment.

Think of a product that you can buy from a supermarket, like maybe a can of soup or an apple.

Start by listing all the properties of that object that you can think of – try to come up with at least
ten
general properties of a Product and write these down in your
Assignment_Part_1_
Microsoft Word document.

Next, use the process of

abstraction

to cut the number of properties back to only
four
‘key’ properties – write these down in the next section of your Word document. Take a look at the week 2 lecture slides if you need a reminder on how to go about this.

Now, fill in the class diagram for your Product class in the Word document template provided. Your product class does not have to have any methods (i.e. functions) associated with it to perform any actions other than a
constructor
which takes and set the four key properties that you’ve identified.

Next we’ll move on to
CheckoutRegister
class – think about what information the checkout has to keep track of to allow you to successfully check out of the supermarket. There will only really be three key properties that the CheckoutRegister cares about, and the CheckoutRegister class should have the following four methods available:

1) A
default constructor
that takes no arguments and initialises a new object and its properties,

2)
accept_payment(some_amount),

3)
scan_item(some_product), and

4) print_receipt().

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Calibri} p.p2 {margin: 0.0px 0.0px 1.1px 0.0px; font: 11.5px Calibri} p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Calibri; min-height: 14.0px}

Fill in the class diagram for the
CheckoutRegister
class in the Word template, and that’s the first part completed!

Using either the online website
https://draw.io
(preferred), or the applications Visio or Powerpoint – create an activity diagram of how the program should operate to successfully scan one or more products, accept payment, provide change and print a receipt for the user.

Make sure to use the
correct symbols
in your diagram for starting, processes, decisions/branches, and ending the process.

Although you should be familiar with how a self-checkout works, if not then you can always go to a local supermarket with a self-checkout and buy a packet of chewing gum or something – or take a look at a YouTube video of self-service checkout, such as this one:
https://www.youtube.com/watch?v=hoyqVvHaL4s.

Don’t worry about loyalty/rewards cards to taking payment through debit or credit cards, our CheckoutRegister will only accept cash – although you can enter multiple denominations via multiple calls to the
accept_money(some_amount)
method. For example, calling
accept_money(5.0)
and then
accept_money(2.0) will mean that the CheckoutRegister knows that you have entered a total of $7.00.
Also note that you can start the entire checkout process off by simply scanning a product.

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Calibri}

Once you have completed your activity flowchart, add it to your assignment template document

You are free to implement the software however you see fit, however the

functionality

of the software should be able to match the following output. Note that in the below run of the program I have ‘hard-coded’ a small number of
Product
instances so that products exist which can they can be checked out – in your code you should do the same.

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.5px Calibri}

Your program does not have to have the facility to add new products – just define a few and use them as demonstrated below. If the final option of (N)ext customer is chosen, the program should run again