Python Please! $29\mathrm{.}24$ LAB$*$: Program: Online shopping cart $($Part $2)$

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

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

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

Implement the following method for the ItemToPurchase class.

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

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

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

$(2)$ Build the ShoppingCart class with the following data attributes and related methods. Note: Some can be method stubs $($empty methods$)$ initially, to be completed in later steps.

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 this 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 this 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 this message: SHOPPING CART IS EMPTY

print$\_$descriptions$()$

Outputs each item's description.

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

$(3)$ 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 $1,2016$

$(4)$ Implement the print$\_$menu$()$ function to print the following menu of options to manipulate the shopping cart. $(1$ pt$)$

Ex:

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

$(5)$ Implement the execute$\_$menu$()$ function that takes $2$ parameters: a character representing the user's choice and a shopping cart. execute$\_$menu$()$ performs the menu options described below, according to the user's choice. $(1$ pt$)$

$(6)$ 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$\text{'}.$ Hint: Implement Quit before implementing other options. $(1$ pt$)$

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:

$(7)$ 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$

$(8)$ Implement Output item's description 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

$(9)$ 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:

$2$

$(10)$ Implement remove item menu option in execute$\_$menu$().(4$ pts$)$

Ex:

REMOVE ITEM FROM CART

Enter name of item to remove:

Chocolate Chips

$(11)$ Implement Change item quantity menu option in execute$\_$menu$().$ Hint: Make