CSIT110- Assignment 3 Solution

- Able to write clear code with comments and follow coding convention
- Able to use variables with meaningful names and correct data types
- Able to define functions and class objects Marking criteria:
- Total mark is 10. Deduct 1 mark for each day late.
- More than 3 days late will result in a zero mark.
- Code must be able to run with no errors: 0 mark for the whole assignment if there is an error is thrown.
- Correct file format (.py extension): 0 mark for the whole assignment if file submission is not in correct format.
- Use submission template for file submission.
- Save your file with this naming format
<name>_<uow_id>_<favourite_cartoon_character>_a3.py

Question 1 correctness, completeness and consistency with the assignment specification 2 marks
Question 2 correctness, completeness and consistency with the assignment specification 2 marks
Question 3 correctness, completeness and consistency with the assignment specification 3 marks
Question 4 correctness, completeness and consistency with the assignment specification 3 marks
Overall comments include name, student number, subject code; clear code and follow coding convention; use variables with meaningful names and correct data types Deduct up to 1 mark

Submission Instruction: Assignment 1 submission is on Moodle. Put all your python code into a single python file (file extension .py) and submit it.

Assignment questions: there are 4 assignment questions.
Write clear code with comments and follow coding conventions. Comments should include your name, student number and subject code on top of your code. Please also add this information to the variables as stated in the template Your code must work exactly like the provided examples given the input in the examples.

name = "John Snow"
student_num = "1234567" # Student number subject_code = "CSIT110" # CSIT110 or SP121
...
Question 1. Define a function that satisfies the following specifications.

Function name process_subscription
Parameters -
Return Value -
Detailed description With the use of a dictionary-typed variable, the function must display the six plans available for subscription and take subscription orders. Your program should work exactly as the following examples. The text in bold indicates user input.
Lines 2 to 7 has two columns. The two columns are 39 characters and 7 characters in width.
There is a space after each colon in the prompts.
The bullets points before the list of selections is a space, a hyphen and a space.

. Example 1: The user subscribes to 2 plans
Packages available for subscription(price/mth)
Standard Food Delivery Plan $13.40
Premium Food Delivery Plan $25.40
Basic Commute Plan $39.80
Premium Commute Plan $69.80
All Access Plan(Lite) $79.60
All Access Plan(Premium) $108.60

Subscribe to Standard Food Delivery Plan? (Y/N): Y
Subscribe to Premium Food Delivery Plan? (Y/N): N
Subscribe to Basic Commute Plan? (Y/N): N
Subscribe to Premium Commute Plan? (Y/N): N
Subscribe to All Access Plan(Lite)? (Y/N): Y Subscribe to All Access Plan(Premium)? (Y/N): N

Your selection:
- Food Delivery Plan($21.40) - All Access Plan(Lite)($9.56)

Total cost $30.96

Example 2: The user subscribes to 0 plan.
Packages available for subscription(price/mth)
Standard Food Delivery Plan $13.40
Premium Food Delivery Plan $25.40
Basic Commute Plan $39.80
Premium Commute Plan $69.80
All Access Plan(Lite) $79.60
All Access Plan(Premium) $108.60

Subscribe to Standard Food Delivery Plan? (Y/N): Y
Subscribe to Premium Food Delivery Plan? (Y/N): N
Subscribe to Basic Commute Plan? (Y/N): N
Subscribe to Premium Commute Plan? (Y/N): N
Subscribe to All Access Plan(Lite)? (Y/N): N Subscribe to All Access Plan(Premium)? (Y/N): N

Your selection:
- None

Total cost $0.00

Important requirement:

Question 2. Define a function that satisfies the following specifications.
Function generate_qns_from_list
Parameters 1. A list.
Each element of this list is a list of integers.
Return Value 1. A list of dictionary objects
Detail Information This function should convert the list parameter into a list of dictionaries. Each dictionary will have two string-typed keys – "qns" and "ans".

The value for the "qns" key will be a str of the integers taken from each list element in the list parameter. In the str, the integers are separated with the characters " + ".

The value for the "ans" key will be the sumof all the numbers in the list.

You should skip the lists that contain less than 2 integers. There is no need to print anything out.

Example:
input_list = [[1,3,3], [2,5,-1],[3,2],[4,5,3],[0,23],[1,2,3,4]]
generate_qns_from_list(input_list)
The function should return the following list
[{"qns": "1 + 3 + 3", "ans": 7},
{"qns": "2 + 5 + -1", "ans": 6},
{"qns": "3 + 2", "ans": 5},
{"qns": "4 + 5 + 3", "ans": 12},
{"qns": "0 + 23", "ans": 23},
{"qns": "1 + 2 + 3 + 4", "ans": 10}]



a.
Define a class that satisfy the following specifications.
Class name ShoppingCart
Class attribute server_url: str
Instance attributes account_id: str cart: dict
Parameter account_id: str
Detailed information Assign the str "128.123.123.0" to the class attribute, server_url.


The instance attribute, cart, is an empty dictionary when a ShoppingCart object is instantiated.
The keys in the dictionary are the product names, of str types, while the values, of int type, mark the quantity of the products in the cart.

Question 3b
Write an instance method for the ShoppingCart class that satisfies the following specifications.
Method name add_item_to_cart
Parameter 1. product_name: str 2. quantity: int
Return value -
Detailed description The function should check if the item exists in the keys of the cart attribute and update the number of the items in the cart accordingly.

That is, if the item does not exist in the cart, it should create a key-value pair for the car. Otherwise, it should add the quantity in the parameter to the existing value.



c
Write an instance method for the ShoppingCart class that satisfies the following specifications.
Method name remove_item_from_cart
Parameter 1. product_name: str 2. quantity: int
Return value -
Detailed description The function should update the cart attribute with the correct number of product. If the updated quantity is 0, the key value pair should be removed from the cart.
You can assume that the product is available for removal and the quantity to be removed is less than or equal to the quantity in the cart.

Question 3d
Write a class method for the ShoppingCart class that satisfies the following specifications.
Method name get_url
Parameter -
Return value 1. A str
Detailed description This method returns the class attribute server_url

Question 3e
Write an instance method for the ShoppingCart class that satisfies the following specifications.
Method name empty_cart
Parameter -
Return value -
Detailed description This method empties the instance attribute, cart


f
Write an instance method for the ShoppingCart class that satisfies the following specifications.
Method name count_items
Parameter -
Return value 1. int
Detailed description This method returns the total number of items based on the existing items in the cart. If there is nothing in the cart, the return value should be 0.
An example of how your code should work given the following parameters.
newCart = ShoppingCart("1234567") newCart.add_item_to_cart("fruit juice", 2) newCart.add_item_to_cart("tissue box", 4) newCart.add_item_to_cart("ice cream", 3)
# newCart.cart is now {"fruit juice": 2, "tissue box": 4, "ice cream": 3}
newCart.remove_item_from_cart("tissue box",1) newCart.remove_item_from_cart("fruit juice",2)
# newCart.cart is now {"tissue box": 3, "ice cream": 3} newCart.count_items() # returns 6
print(newCart.get_url()) # prints 128.123.123.0 newCart.empty_cart() newCart.count_items() # returns 0




Question 4
Part 1
The checksum letter of a magic 7 digits number is calculated as such:
D = [(i1 i2 i3 i4 i5 i6 i7) • (2 7 6 5 4 3 2 )] mod 11
= ( 2i1 + 7i2 + 6i3 + 5i4 + 4i5 + 3i6 + 2i7 ) mod 11
Where ix is the 1st to last of the 7 digits of the numbers and (2,7,6,5,4,3,2) are the weights.
The checksum is a letter which corresponds to the number d as shown in the look-up table below

Question 4a
Define a function that meets the following specifications.
Method name get_magic_num_checksum
Parameter 1. str
This str contains the numerical series mentioned in the description above.

Return value 1. str
An upper case letter
Detailed description
From the given string of 7 numbers, computer the number d as described in the section 'Part 2'. Return the letter which corresponds to the number d as shown in the look-up table below



Part 2
A typical vehicle registration number comes in the format xxx #### y:
• x – prefixes
• #### – Numerical series (from 1 to 9999, without leading zeroes)
• y – Checksum
• The checksum letter is calculated by converting the letters into numbers, i.e., where A=1 and Z=26, potentially giving seven individual numbers from each registration plate. However, only two letters of the prefix are used in the checksum. For a three-letter prefix, only the last two letters are used; for a two-letter prefix, both letters are used; for a single letter prefix, the single letter corresponds to the second position, with the first position as 0. For numerals less than four digits, additional zeroes are added in front as placeholders, for example "1" is "0001". SBS 3229 would therefore give 2, 19, 3, 2, 2 and 9 (note that "S" is discarded); E 12 would give 0, 5, 0, 0, 1 and 2. SS 108 would be given as 19, 19, 0, 1, 0, 8.
• Each individual number is then multiplied by 6 fixed numbers (9, 4, 5, 4, 3, 2). These are added up, then divided by 19. The remainder corresponds to one of the 19 letters used (A, Z, Y, X, U, T, S, R, P, M, L, K, J, H, G, E, D, C, B), with "A" corresponding to a remainder of 0, "Z" corresponding to 1, "Y" corresponding to 2 and so on. In the case of SBS 3229, the final letter should be a P; for E 23, the final letter should be a H. SS 11 back letter should be a T. The letters F, I, N, O, Q, V and W are not used as checksum letters.
Question 4b
Define a function that meets the following specifications.
Function name get_car_plate_checksum
Parameter 1. str
This str contains the prefixes and numerical series mentioned in the description above.
Return value 1. str
An upper case letter
Detailed description
Compute and return the checksum from the string parameter. The computation logic is described in the section titled 'Part 1'.
The checksum is one character in length. The return value is case insensitive.