SOLVED:HOMEWORK 02: FRUITFUL FUNCTIONS & CONDITIONALS

Introduction

The goal of this homework is for you to learn the difference between print and return as well as give you practice with conditionals. Part 1 consists of 4 simple functions and 1 function which uses those 4 functions. Part 2 consists of 2 functions that will test your knowledge of conditionals. You have been given HW2.py to fill out with instructions in the docstrings. However, below you will find more detailed information to complete your assignment. Read it thoroughly before you begin. You have until Thursday, September 7th to complete this assignment.

Print vs Return

Two concepts that may be difficult for beginner programmers to differentiate between are the print function and the return statement. While it may appear that they do the same thing, it is important to note that they do not do the same thing. The print function as its name states, is a function just like round or any other pre-defined and user defined functions. The only purpose for the print function is to display information to the user. You cannot save what you print. The return statement, on the other hand, is part of a function definition. All functions have a return statement, whether you explicitly write one or not; functions that do not explicitly have a return statement always return the value None. The return statement is useful because it allows you to assign a value to a function, thus allowing you to either save it for later, use it in a more complex expression, or print it for human consumption.

Important note to remember: print is for the user whereas return is for the program.






HOMEWORK 02: FRUITFUL FUNCTIONS & CONDITIONALS
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Part 1: Market Place

You’ve just moved into your dorm room and now you need to do some shopping. Using the table below, write the following functions to help you at the grocery store. NOTE: the list price value is the usual price of the item; the current price value is how much the store is selling the item for right now.

Item name
# in stock
List price
Current price




“avocado”
OUT OF STOCK
$1.50
$1




“toothpaste”
5
$2.75
$2.75




“popcorn”
10
$1
$1




“bottled water”
8
$5.50
$4




“phone charger”
1
$15
$12





Function name (1): is_in_stock

Parameters: item (str), quantity (int)

Return value: True or False (bool) or None (NoneType)

Description:

Write a function that determines whether or not the parameter item is in stock. If so, you also need to check that there are enough of that item in stock to fulfill your order (specified by the parameter quantity). Return True if these conditions are met, False otherwise. Return None if the item is not in the table.

Test Cases (not an exhaustive list:

is_in_stock(“avocado”, 3) à False
is_in_stock(“bottled water”, 1) à True

is_in_stock(“popcorn”, 100) à False

is_in_stock(“potato chips”, 5) à None


Function name (2): can_afford

Parameters: item (str), quantity (int), wallet (int)

Return value: True or False (bool) or None (NoneType)

Description:

Write a function that determines whether or not you can afford the parameter item, given the number of that item you would like to buy (specified by parameter quantity ), the amount of money you have (specified by parameter wallet), and the item’s current price value in the table. You do not need to consider whether there are enough of the item in stock for this function. Return True if you can afford this item, False otherwise. Return None if the item is not in the table.

Test Cases (not an exhaustive list:

can_afford(“avocado”, 500, 5) à False
can_afford(“phone charger”, 10, 500) à True can_afford(“mouthwash”, 1, 20) à None



HOMEWORK 02: FRUITFUL FUNCTIONS & CONDITIONALS
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Function name (3): is_on_sale

Parameters: item (str)

Return value: True or False (bool) or None (NoneType)

Description:

Write a function that determines whether or not the parameter item is on sale, according to the list price and current price values for the item in the table. You do not need to consider whether the item is in stock for this function. Return True if it is on sale, False otherwise. Return None if the item is not in the table.

Test Cases (not an exhaustive list:

isOnSale(“phone charger”) à True
isOnSale(“toothpaste”) à False

isOnSale(“chocolate bar”) à None


Function name (4): is_cheaper

Parameters: item1 (str), item2 (str)

Return value: 0 (int) or 1 (int) or -1 (int) or None (NoneType)

Description:

Write a function that determines whether item1 is cheaper than item2, based on their current prices. If item1 is cheaper than item2, return 1. If item1 is more expensive than item2, return -1. If they are equally- priced, return 0. If either parameter item1 or item2 is invalid (i.e. is not included in the table), return None.

Notes:

    • You do not need to consider whether the items are in stock for this function.

    • Item names will always be strings; you are not responsible to account for different spellings or capitalizations of the items listed above.
    • Review the test cases below to confirm edge cases.

Test Cases (not an exhaustive list:

is_cheaper(“popcorn”, “bottled water”) à 1

is_cheaper(“avocado”, “popcorn”) à 0
is_cheaper(“toothpaste”, “floss”) à None























HOMEWORK 02: FRUITFUL FUNCTIONS & CONDITIONALS
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Part 2: Concert Listing

You come across a concert listing with some of your favorite artists! There are prices for single tickets and group tickets (in packs of 10), and you want to decide how you can attend as many concerts as possible with your given budget. The following functions help you achieve that goal.


Taylor Swift
Adele
Zac
Brown Band
Single Tickets
$275
$152
$25

Group Tickets(10)
$3000
$1500
$200



Function name (1): is_single_cheaper

Parameters: artistName(str)

Return value: boolean

Description:

Write a function that takes in the name of one of the artists from the chart. Decide whether or not it would be cheaper to buy a single ticket, or to get the group ticket price and divide it amongst 10 people. If it’s cheaper for single tickets, then return True, and if not, then return False. If the artist is not valid, return None.

Test Cases (not an exhaustive list):

is_single_cheaper("Taylor Swift") à True is_single_cheaper("Chainsmokers") à None


Function name (2): best_price

Parameters: artistName(str)

Return value: representing the best price the user would pay to attend the artist’s concert (int)

Description: Write a function that takes in the name of one of the artists from the chart. Using the is_single_cheaper function, determine whether a single ticket or group ticket would be the cheapest, and then return the price of the ticket as an integer. If the group option ends up being the cheapest, do not return the full price for the group, but the price once it is divided by 10 people. If the artist is not valid, return None.

Test Cases (not an exhaustive list):

best_price("Taylor Swift") à 275
best_price("Avicii") à None



Function name (3): all_three

Parameters: None

Return value: representing how much it would cost to attend all three concerts (int)

Description: Write a function that uses the best_price function to determine the best prices of each of the concerts, sums them all up, and returns the total cost.







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Function name (4): cheapest_concert

Parameters: None

Return value: representing the name of the artist with the cheapest concert (str)

Description: Write a function that uses the best_price function to determine the best prices of each of the concerts, and then returns the name of the artist with the cheapest concert. You may not use any built in Python functions.


Function name (5): add_two

Parameters: artist1 (str), artist2 (str)

Return value: representing the cost to go to both concerts (int)

Description: Write a function that takes in two artists from the table above, and calculates how much it would cost to attend both concerts based on their best prices. Return the total cost.

Function name (6): can_afford_concerts

Parameters: money(int)

Return value: None

Description: Write a function that will be using some of the functions that you have written above. Based on the money passed in, determine if you can go to all three concerts, only two concerts, or only the cheapest concert. If you can go to all three, print “I can go to all three!”, if you can only go to two of any combination, (Taylor Swift and Adele, Adele and Zac Brown Band, etc), then print “I can only go to two!”, and if you can only go to one concert, print a statement in the format of “I can only go to one.”. If there is not enough money for any of those options, then print out a statement that says “Dang it, I can’t go to any concert.”. Note: It’s very important that you print out your answer EXACTLY as it’s formatted in the instructions.

Test Cases (not an exhaustive list):

can_afford_concerts(5)
    • Dang it, I can’t go to any concert. can_afford_concerts(24)

    • I can only go to one.
























Authors: Erica Chia and Christine Feng | Report Issues: echia3@gatech.edu or christinefeng@gatech.edu
HOMEWORK 02: FRUITFUL FUNCTIONS & CONDITIONALS
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Part 3: Miscellaneous

Function name: what_can_you_do

Parameters: age(int)

Return value: None

Description: Write a function that takes in the age of the user and prints out all the activities they are able to do based on the table below. If they can’t do any of those activities, print out “Sorry, you’re not old enough for any of these”.

Age
Activity
18
vote
21
party
65
retire


Test Cases (not an exhaustive list):

what_can_you_do(5)
    • Sorry, you’re not old enough for any of these. what_can_you_do (68)
    • You can vote, party, and retire.

Function name: pass_or_fail

Parameters: current_grade (int), final_weight (float), final_score (int)

Return value: final letter grade A, B, C, D, or F (str)

Description: Write a function that will take your current grade in a class, the weight of the final exam as a decimal between 0 and 1, and the score you got on the final exam to determine what letter grade you’ll receive using the following formula:
_    =    _    ∗ (1 −    _        ℎ  ) +    _    ∗    _        ℎ  

Use the following ranges for letter grades:

    • A: 90-100

    • B: 80-89.9999

    • C: 70-79.9999

    • D: 60-69.9999

    • F: 0-59.9999

Test Cases (not an exhaustive list):

pass_or_fail(90, .15, 75)    <- B
pass_or_fail(60, .3, 100)    <- C











Authors: Erica Chia and Christine Feng | Report Issues: echia3@gatech.edu or christinefeng@gatech.edu
HOMEWORK 02: FRUITFUL FUNCTIONS & CONDITIONALS

Grading Rubric

- is_in_stock: 10 points

Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
- can_afford: 10 points

Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
- is_on_sale: 10 points

Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
- is_cheaper: 10 points

Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
- is_single_cheaper: 10 points

Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
-  best_price: 10 points

Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
- all_three: 5 points
5 Points
Correct Value is returned:

- cheapest_concert: 10 points

Correct Value is returned:
10 Points
-  add_two: 5 points

Passes some test cases:
2/5 Points
Passes all test cases:
5/5 Points
    • can_afford_concerts: 10 points
Passes some test cases:
3/10 Points
Passes all test cases:
10/10 Points
- what_can_you_do: 5 points

Passes some test cases:
2/5 Points
Passes all test cases:
5/5 Points
- pass_or_fail: 5 points
2/5 Points
Passes some test cases:

Passes all test cases:
5/5 Points
Provided

The following file(s) have been provided to you.

    1. HW2.py
7

This is the file you will edit and implement. All instructions for what the methods should do are in the docstrings.

Deliverables

You must submit all of the following file(s). Please make sure the filename matches the filename(s) below. Be sure you receive the confirmation email from T-Square, and then download your uploaded files to a new folder and run them.

    1. HW2.py


Authors: Erica Chia and Christine Feng | Report Issues: echia3@gatech.edu or christinefeng@gatech.edu