PYTHON:

$13\mathrm{.}17$ LAB$*$: Program: Online shopping cart $($Part $2)$

Step $1$: Extend the ItemToPurchase class to contain a new

attribute. $(2$ pts$)$

Ex of print Iten$\_$l$$cigheson $||$ outout

Bots:

Step $2$: Build the ShoppingCart class with the following data

attributes and related methods.

Aftrinutes

heriods

d asin$\_$zes$()$

R$$mo$.$

resdufy$\_$zemil

print$\_$total$()$

Outputs total of objects in cart.

If cart is empty, output a message: SHOPPING CART IS EMPTY

print$\_$descriptions$()$

Outputs each item's description.

If cart is empty, output a message: SHOPPING CART IS EMPTY

Ex$.$ of print$\_$total$()$ output:

John Doe's Shopping Cart $-$ February $1,2016$

Number of Items: $8$

Nike Romaleos $2$ @ $$189=$ $$378$

Chocolate Chips $5$ @ $$3=$ $ $$15$

Powerbeats $2$ Headphones $10$ $$128=$ $$128$

Total: $$521$

Ex$.$ of print$\_$descriptions$()$ output:

John Doe's Shopping Cart $-$ February $1,2016$

Item Descriptions

Nike Romaleos: Volt color, Weightlifting shoes

Chocolate Chips: Semi$-$sweet

Powerbeats $2$ Headphones: Bluetooth headphones

Step $3$: In the main section of the code, prompt the user for a

customer's name and today's date. Output the name and date.

Create an object of type ShoppingCart. $(1$ pt$)$

Ex:

Enter customer's name:

John Doe

Enter today's date:

February $1,2016$

Customer name: John Doe

Today's date: February $1,2016$

Step $4$: Implement the following menu functions

print$\_$menu$()$

Prints the following menu of options to manipulate the shopping cart. $(1$ pt$)$

MENU

a $-$ Add item to cart

r $-$ Remove item from cart

c $-$ Change item quantity

i $-$ Output items' descriptions

Output shopping cart

q $-$ Quit

execute$\_$menu$()$

Takes $2$ parameters: a character representing the user's choice and a shopping cart. Performs the menu options described

below in step $5,$ according to the user's choice. $(1$ pt$)$

Step $5$: Implement the menu options

Step $5$a: In the main section of the code, call print$\_$menu $()$ and prompt for the user's choice of menu options. Each option is

represented by a single character.

If an invalid character is entered, continue to prompt for a valid choice. When a valid option is entered, execute the option by calling

execute$\_$menu $().$ Then, print the menu and prompt for a new option. Continue until the user enters $\text{'}$ q $\text{'}.(1$ pt$)$

Hint: Implement Quit before implementing other options.

Ex:

a $-$ Add item to cart

r $-$ Remove item from cart

c $-$ Change item quantity

i $-$ Output items' descriptions

Output shopping cart

q $-$ Quit

Choose an option:

Step $5$b: Implement 'Output shopping cart' menu option in execute$\_$menu $().(3$ pts$)$

Ex:

OUTPUT SHOPPING CART

John Doe's Shopping Cart $-$ February $1,2016$

Number of Items: $8$

Nike Romaleos $2$ @ $$189=$ $$378$

Chocolate Chips $5$ @ $$3=$ $$15$

Powerbeats $2$ Headphones $1$ @ $$128=$ $$128$

Total: $$521$

Step $5$c: Implement "Output items' descriptions" menu option in execute$\_$menu $().(2$ pts$)$

Step $5$c: Implement "Output items' descriptions" menu option in execute$\_$ menu $().(2$ pts$)$

Ex:

OUTPUT ITEMS' DESCRIPTIONS

John Doe's Shopping Cart $-$ February $1,2016$

Item Descriptions

Nike Romaleos: Volt color, Weightlifting shoes

Chocolate Chips: Semi$-$sweet

Powerbeats $2$ Headphones: Bluetooth headphones

Step $5$d: Implement 'Add item to cart' menu option in execute$\_$menu $().(3$ pts$)$

Ex:

ADD ITEM TO CART

Enter the item name:

Nike Romaleos

Enter the item description:

Volt color, Weightlifting shoes

Enter the item price:

$189$

Enter the item quantity:

$2$

Step $5$e: Implement 'Remove item from cart' menu option in execute$\_$ menu $().(4$ pts$)$

Ex:

REMOVE ITEM FROM CART

Enter name of item to remove:

Chocolate Chips

Step $5$f: Implement "Change item quantity" menu option in execute$\_$menu $().(5$ pts$)$

Hint: Make a new ItemToPurchase object before using Modifyltem$()$ method.

Ex:

CHANGE ITEM QUANTITY

Enter the item name:

Nike Romaleos

Enter the new quantity:

$3$