ITECH1400 – Foundations of Programming – SEM3/20 School of Science, Engineering and Information Technology

ITECH1400 – Foundations of Programming – SEM3/20
School of Science, Engineering and Information Technology
ITECH1400 – Assignment 2 – Money Manager
Due Date: Friday of Week 11 at 5pm
This assignment will test your skills in designing and programming applications to specification and is worth
20% of your non-invigilated (type A) marks for this course. This is an INDIVIDUAL ASSIGNMENT – and
while you may discuss it with your fellow students, you must not share designs or code or you will be in
breach of the university plagiarism rules. This assignment should take you approximately 20 hours to
complete.
Assignment Overview
You are tasked with creating an application that uses a GUI that simulates a simple money manager. This tool
is used to track all spending of an individual.
The assignment is broken up into the following main components:
1.) The ability to provide a login screen to prevent other people from viewing the information contained in
the tool
2.) The ability to view the current balance funds, add purchases made and deposits into the balance
3.) The ability to save the transactions to a file so that you can log in, add transactions to the application, log
out and then return to find all of the transactions still there – i.e. the data is persistent.
4.) The ability to display a graph of your spending broken down by type – i.e. food, bills, rent.
5.) A Test Case that ensures that your simple money manager works as required.
Your submission should consist three Python scripts that implement the computer program
(moneymanager.py, main.py and testmoneymanager.py).
You are provided with a ‘stub’ of each of these files which contain all the function declarations and comments
which describe the role of the function and how it can be put together, but you will have to write the code for
vast majority of the functions yourself.
Your final submission should be a zipped archive (i.e. ‘zip file’) containing your completed Python scripts.
Assignment Part 1 Details
Class Design – Money Manager Tool
The following design for MoneyManager
The following is the functionality of the class:
• add_entry – this adds a new entry into the money manager representing the spending of the user. This
includes the amount spent and the type of item the money was spend on. It also removes the amount from the
current balance. For the sake of simplicity the type of item the money was spent on can only be food, rent,
bills, entertainment or other – any other type will raise an exception that should be handled
• Each transaction in the transaction_list is a tuple containing the word Deposit followed by an amount or
EntryType followed by an amount
• The user of the tool cannot go into a negative balance so the user cannot spend money that is not available
in their user account. So if they have $100 in their user account and then want to add an entry to spend $150,
an exception will be raised with a suitable error message which is caught and displayed in the main.py file
where the operation was attempted.
• All error messages, such as those from exceptions, should be displayed in a pop-up message box
• The get_transaction_string method should loop over all the transactions in the transaction_list creating a
string version (with newline characters) of all the transactions associated with the user.
• The save_to_file function should save the user_number, pin_number, and balance in that order to a file
called user_number .txt followed by the transaction list string generated from the get_transaction_string()
method. The name of the user file is NOT ‘ user_number .txt’ – the name of the file is the ACTUAL USER
NUMBER followed by -.txt-, so for an user with user_number 123456 the name of the user file would be
123456.txt.
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School of Science, Engineering and Information Technology
The Main Python Script
Our main.py script will contain all the main logic for our program. It will allow us to:
• Enter a user number via an Entry field by using the keyboard,
• Enter a PIN number via an Entry widget (we can use the keyboard OR a series of buttons to enter the
PIN),
• Once we are logged in we must be able to:
o See the balance of the user, o Deposit money for the user,
o Add entries to represent spending of funds from our user (only up to the amount we have available),
o Display a plot of spending o Log out of our user.
Every time a successful deposit or entry is made then a new transaction should be added to the user’s
transaction list. When we log out then the user file is overwritten with the new user details including our new
balance and any transactions if any have been made. The format of the user text file is as follows (each value
on separate lines): user_number user_pin currentBalance
123456
7890
800.00
After these first three lines we may have a number of transactions, each of which is specified as two lines. A
deposit is indicated by the word Deposit on one line and then the amount on the next like. For example a
deposit of $500 would look like this:
Deposit
500.00
Similarly, a entry is also specified as two lines – first the word being the type of entry and then on the next
line the amount, for example entries representing rent of $200 and bills of $250 would look like this:
Rent
200.00
Bills
250.00
You are provided with an example user file called 12345678.txt – this file along with others will be used to
mark your assessment, so you should make sure that your final submission can use users in this format
successfully.
Login Screen
When the application is first launched, it should open a window that is -500×660- pixels in size (use the
window object’s geometry function to set this). Set the title of the window to -FedUni Money Manager- using
the top-level window object’s winfo_toplevel().title() function.
The window uses the GridManager layout manager for placing GUI elements (e.g. ‘widgets’), it contains a
Label that spans the top of the window saying -FedUni Money Manager- (font size is 28). On the next line is
a label saying -User Number- and then an Entry widget for the user to type in their user number and an entry
for the PIN number.
It then has a series of buttons from 0 through 9, along with a Log In button and a Clear/Cancel button.
Each time a number is pressed it is added to a string – for example, if the user pushed the 4 button then the 3
button then the 2 button and then the 1 button then the string should contain the text -4321-. By using the
show=-*- attribute you can ‘mask’ the input so that anyone looking over your shoulder cannot see the exact
pin number, they’ll just see -****- instead. When the Clear/Cancel button is pressed, or when a user -logs outthen this PIN string should be reset
to an empty string.
When the Log In button is pressed then the program should attempt to open the file with the user number
followed by -.txt- – so in the example below, because the user number entered was -123456-, the program will
attempt to open the file -123456.txt-.
If that file could not be opened then a message box should display a suitable error message such as -Invalid
user number – please try again!-. You will have to -try/catch- this risky functionality to avoid the program
crashing – see the week 7 lecture materials if you need a recap.
If the user exists, then Money Manager object should be created and the fields of the Money Manager object
should be set (e.g. user_number, pin number, balance, and the transaction list).
Because you don’t know how many transactions are stored for this user, after reading the first three lines you
will need to attempt to read two lines and if they exist create a tuple of the transaction (i.e. it’s type and
amount) and then add it to the Money Manager object’s transaction_list – for example you may do the
following in a loop:
# Try to read a line, break if we’ve hit the end of the file line = read_line_from_user_file() if not line:
break
else:
# read another line, create a tuple from both lines and append the # tuple to the the Money Manager object’s
transaction list
The user screen has:
– A large -FedUni Money Manager- label at the top that spans 5 columns (font size is 22),
– A label with the user number followed by the actual user number displayed,
– A label with the current balance followed by the actual balance,
– A log out button which saves the user file (overwriting it) and causes all widgets to be removed from the
screen and the log in screen displayed again,
– An -Amount- label followed by an amount Entry widget where you can type in how much to deposit or an
entry added,
– Deposit and Withdraw buttons that deposit or withdraw funds using the Money Manager classes methods to
do so,
– A Text widget (i.e. multi-line text) that shows all the transactions associated with the user. The height of this
widget is 10 lines and the width of the widget is 48 characters.
– To the right of the Text widget this is a scrollbar which can be used to scroll the Text widget (it is not really
showing in the above screenshot because the Text widget does not have more than 10 lines worth of content),
and finally
– At the bottom of the screen is a plot (histogram) of the spending of the user broken down by type Below is
the top section of the screen:
Money Manager Test Case
The final thing to do is to add a small test case consisting of seven unit tests that ensure that the
Money Manager class’ deposit funds and add entry methods operate correctly.
You are provided with a stub of a testmoneymanager.py test case that already has the definitions of unit tests
that you will write and a description of what they are testing. Your job is to write suitable assert statements
into each of these unit tests so that they ensure the Money Manager class’ deposit and add entry functions do
operate as they should. You should be able to accomplish each unit test in a maximum of two lines of code
per unit test.
Two things to remember:
1.) The setup method is automatically executed before each unit test, so the balance gets reset to 1000.0
before each test, and
2.) If your unit test fails (and the test is correct) then you should modify your code so that it passes the test,
not the test so that it matches up with what your code is doing!
Development and Marking Tips
You will need to bind all the numerical log in buttons to the Button-1 event and the same function, and then
extract which button was pressed to help ‘build up’ the PIN number text. To extract which widget triggered
the function use event. widget[-text-].
You are provided with the complete function to remove all widgets from the top level window, the function to
read a line from the user file which does NOT include the final – – newline character and most of the code to
generate a graph and place it in your window – so you do not have to write these yourself.
The grid for the login screen has 3 columns and 6 rows, while the grid for the user screen has 5 columns and
5 rows. The fifth column on the user screen is the one holding the scrollbar.
Once you have your login screen working, it makes sense to set the user number variable and PIN number
variables to ‘123456’ and ‘7890’ respectively so that they are already filled in when you launch the app and
you can immediately click the -Log In- button to move to the user screen. Without this you will have to enter
these values each time you run the program, which will be a nuisance.
When you are writing your code to save the money manager user object to file be aware that if the function
fails before closing the file then the file will now be blank (i.e. it will not contain any user details). As such,
it’s probably best to keep a copy of the file close by so you can replace it if necessary.
The way this assignment is marked is a little different from assignment 1 where you could get marks for
effort – that is, if something didn’t quite work as it should you would still get marks. This was because you
were designing the code and its logical flow. In this assignment you are given a precise specification of how
the application should work, and the marking guide is more along the lines of -did you implement this feature
as specified?, did you implement that feature as specified?-.
The answer to these questions is largely a simple yes or no – if you did, you get the mark – and if you didn’t
then you don’t get the mark. If your code doesn’t run at all (i.e. it produces an error on startup) then it means
your code cannot possibly implement the functionality, and your marks will be severely affected. Nobody
wants this – so even if you do not implement the entire suite of functionality, please make sure that your code
at least runs!
As a final reminder, please do not add functionality that is not described in this document. Rather than being
rewarded with extra marks you will be penalized for not matching the project specification.
Submission and Marking Process
You must supply your program source code files and your document containing the first two section of the
assignment as a single compressed archive called:
ITECH1400_Assignment_1_ YOUR-NAME _ YOUR-STUDENT-ID .zip
Obviously replace YOUR-NAME and YOUR-STUDENT-ID) with your own personal details! You may
supply your word processed documentation in either Microsoft Word or LibreOffice/OpenOffice formats only
– no proprietary Mac specific formats, please.
Assignments will be marked on the basis of fulfilment of the requirements and the quality of the work. In
addition to the marking criteria, marks may be deducted for failure to comply with the assignment
requirements, including (but not limited to):
• Incomplete implementation(s), and
• Incomplete submissions (e.g. missing files), and
• Poor spelling and grammar.
Submit your assignment (all program source files plus your word processed document) Moodle.
The mark distribution for this assignment is explained on the next page – please look at it carefully and
compare your submission to the marking guide.
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Assignment 2 – FedUni Money Management Tool
Student name: Student ID:
Part Assessment Criteria Weight Mark
1 Window is correct size with correct title 1
2 Label displayed across the top in large font of login screen 1
3 User number and pin at the top of the login screen 1
4 All pin input is masked (i.e. uses * rather than numbers) 1
5 Incorrect user number – error message 1
6 Incorrect pin number – error message 1
7 Cancel/clear – clears PIN only 1
8 Login with valid user and PIN logs to user screen 1
9 Label displayed across the top of user screen 1
10 User number is displayed 1
11 User balance is displayed 1
12 Log out button exists and returns user to login screen 1
13 Log out button saves user details to user file with any changes 1
14 Labels and buttons exist as required – 1 mark for each up to 5 marks 5
15 Deposit – able to deposit money into user and adds to the balance 3
16 Deposit – illegal value provides suitable error message box 1
17 Add Entry – able to add an entry with a type of Rent, Spending, etc 3
18 Add Entry – with invalid type provides error message box 1
19 Add Entry – with insufficient funds provides error message box 1
20 Add Entry – with invalid number provides error message box 1
21 Transactions – displayed in Multiline Text widget 1
22 Transactions – new valid transactions are added 2
23 Multiline Text- has a scrollbar that works 1
24 Graph of spending exists and is correct 5
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25 Graph of spending is updated when the balance is changed 5
26 Coding is commented sufficiently 5
27 Functionality only as described within assignment sheet 3
Assignment total (out of 50 marks)
Contribution to grade (out of 20 marks)
Comments:

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