Python

This program extends the earlier "Online shopping cart $($Part $1)"$ program. $($Consider first saving your earlier program$).$

Step $1$: Extend the ItemToPurchase class to contain a new attribute. $(2$ pts$)$

item$\_$description $($string$)-$ Initalized in default constructor to "none"

Implement the following method for the ItemToPurchase class.

print$\_$item$\_$description$()-$ Prints item$\_$description attribute for an ItemToPurchase object.

Ex$.$ of print$\_$item$\_$description$()$ output:

Bottled Water: Deer Park, $12$ oz$.$

Step $2$: Build the ShoppingCart class with the following data attributes and related methods.

Parameterized constructor which takes the customer name and date as parameters $(2$ pts$)$

Attributes

customer$\_$name $($string$)-$ Initialized in default constructor to "none"

current$\_$date $($string$)-$ Initialized in default constructor to "January $1,2016"$

cart$\_$items $($list$)$

Methods

add$\_$item$()$

Adds an item to cart$\_$items list. Has a parameter of type ItemToPurchase. Does not return anything.

remove$\_$item$()$

Removes item from cart$\_$items list. Has a string $($an item's name$)$ parameter. Does not return anything.

If item name cannot be found, output a message: Item not found in cart. Nothing removed.

modify$\_$item$()$

Modifies an item's quantity. Has a parameter of type ItemToPurchase. Does not return anything.

If item can be found $($by name$)$ in cart, modify item in cart.

If item cannot be found $($by name$)$ in cart, output a message: Item not found in cart. Nothing modified.

get$\_$num$\_$items$\_$in$\_$cart$()(2$ pts$)$

Returns quantity of all items in cart. Has no parameters.

get$\_$cost$\_$of$\_$cart$()(2$ pts$)$

Determines and returns the total cost of items in cart. Has no parameters.

print$\_$total$()$

Outputs total of objects in cart.

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

Outputs total cost of items in cart.

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 $1$ @ $$128=$ $$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

o $-$ 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

o $-$ 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$)$

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 ModifyItem$()$ method.

Ex:

CHANGE ITEM QUANTITY

Enter the item name:

Nike Romaleos

Enter the new quantity:

$3$