Question

11.12 LAB*: Program: Online shopping cart (continued)

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 parameter 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 description, price, and/or quantity. Has parameter ItemToPurchase. Does not return anything.

• If item can be found (by name) in cart, check if parameter has default values for description, price, and quantity. If not, 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 main section of your 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. print_menu() has a ShoppingCart parameter, and outputs a menu of options to manipulate the shopping cart. Each option is represented by a single character. Build and output the menu within the function.

If the an invalid character is entered, continue to prompt for a valid choice. Hint: Implement Quit before implementing other options. Call print_menu() in the main() function. Continue to execute the menu until the user enters q to Quit. (3 pts)

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

Choose an option:

(5) Implement Output shopping cart menu option. (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

(6) Implement Output item's description menu option. (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

(7) Implement Add item to cart menu option. (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

(8) Implement remove item menu option. (4 pts)

Ex:

REMOVE ITEM FROM CART
Enter name of item to remove:
Chocolate Chips

(9) Implement Change item quantity menu option. Hint: Make new ItemToPurchase object before using ModifyItem() method. (5 pts)

Ex:

CHANGE ITEM QUANTITY
Enter the item name:
Nike Romaleos
Enter the new quantity:
3

LAB

ACTIVITY

11.12.1: LAB*: Program: Online shopping cart (continued)

Python 3 please

Answer 1

#Declare the class ItemToPurchase

class ItemToPurchase:

    #Parameter Constructor

    def __init__(self, item_name='none', item_price=0, item_quantity=0, item_description = 'none'):

        self.item_name = item_name

        self.item_price = item_price

        self.item_quantity = item_quantity

        self.item_description = item_description

     

    #Implement the method

    def print_item_cost(self):

        #print the output in a specifed format

        string = '{} {} @ ${} = ${}'.format(self.item_name, self.item_quantity, self.item_price,

                                                (self.item_quantity * self.item_price))

        cost = self.item_quantity * self.item_price

        return string, cost

    #Implement the method print_item_description

    def print_item_description(self):

        string = '{}: {}'.format(self.item_name, self.item_description)

        print(string, end='\n')

        return string

#Declare the class ShoppingCart

class ShoppingCart:

    #Parameter Constructor

    def __init__(self, customer_name = 'none', current_date = 'January 1, 2016', cart_items = []):

        self.customer_name = customer_name

        self.current_date = current_date

        self.cart_items = cart_items

    #Implement method to add item in the shopping cart

    def add_item(self, string):

        print('\nADD ITEM TO CART', end='\n')

        #prompt the name and description of item,price and Quentity

        item_name = str(input('Enter the item name: '))

        item_description = str(input('\nEnter the item description: '))

        item_price = int(input('\nEnter the item price: '))

        item_quantity = int(input('\nEnter the item quantity: '))

        #Append the above values in to the list

        self.cart_items.append(ItemToPurchase(item_name, item_price, item_quantity, item_description))

    #Implement the method to delete the item in the cart

    def remove_item(self):

        print('\nREMOVE ITEM FROM CART', end='\n')

        #prompt the item to remove the list

        string = str(input('Enter name of item to remove: '))

        i = 0

        #Using for-loop to iterate every item

        for item in self.cart_items:

            #If item found delete in the list

            if(item.item_name == string):             

                del self.cart_items[i]

                i += 1

                #set the flag value to true

                #break from the list

                flag=True

                break

            #Otherwiese set value to false

            else:

                flag=False

        #IF the value not found

        if(flag==False):

            #print the message

            print('Item not found in cart. Nothing removed')

    #Implement the method modifyitem to chane the Quantity

    def modify_item(self):

        print('\nCHANGE ITEM QUANTITY', end='\n')

        #Prompt the input item

        name = str(input('Enter the item name: '))     

        #Using for-loop to iterate every item

        for item in self.cart_items:

            #If item found update Quantity in the list

            if(item.item_name == name):

                quantity = int(input('Enter the new quantity: '))

                item.item_quantity = quantity

                #set the flag value to true

                #break from the list

                flag=True

                break

            #Otherwiese set value to false

            else:

                flag=False

        #IF the value not found

        if(flag==False):

            #print the message

            print('Item not found in cart. Nothing modified')

    #implement method to compute total number of items in the cart

    def get_num_items_in_cart(self):

        num_items=0

        #Using for-loop to iterate the cart

        for item in self.cart_items:

            #ADD the Quantities

            num_items= num_items+item.item_quantity

        #return the num_Items

        return num_items

    #Implement the method

    def get_cost_of_cart(self):

        total_cost = 0

        cost = 0

        #Using for-loop to iterate the list

        #mulitply the price and Quantity

        #add value to the Total_Cost

        for item in self.cart_items:

            cost = (item.item_quantity * item.item_price)

            total_cost += cost

        #return the value

        return total_cost

    #Implement the method to print the total

    def print_total():

        total_cost = get_cost_of_cart()

        if (total_cost == 0):

            print('SHOPPING CART IS EMPTY')

        else:

            output_cart()

    #Implement the method to print_descriptions    

    def print_descriptions(self):

        print('\nOUTPUT ITEMS\' DESCRIPTIONS')

        print('{}\'s Shopping Cart - {}'.format(self.customer_name, self.current_date),end='\n')

        print('\nItem Descriptions', end='\n')

        for item in self.cart_items:

            print('{}: {}'.format(item.item_name, item.item_description), end='\n')

    #Implement the method output_cart()

    def output_cart(self):

        new=ShoppingCart()

        print('\nOUTPUT SHOPPING CART', end='\n')

        print('{}\'s Shopping Cart - {}'.format(self.customer_name, self.current_date),end='\n')    

        print('Number of Items:', new.get_num_items_in_cart(), end='\n\n')

        tc = 0

        for item in self.cart_items:

            print('{} {} @ ${} = ${}'.format(item.item_name, item.item_quantity,

                                             item.item_price, (item.item_quantity * item.item_price)), end='\n')

            tc += (item.item_quantity * item.item_price)

        print('\nTotal: ${}'.format(tc), end='\n')

#Implement the method print_menu

def print_menu(ShoppingCart):

    customer_Cart = newCart

    string=''

    #declare the string menu

    menu = ('\nMENU\n'

    'a - Add item to cart\n'

    'r - Remove item from cart\n'

    'c - Change item quantity\n'

    'i - Output items\' descriptions\n'

    'o - Output shopping cart\n'

    'q - Quit\n')

    command = ''

    #Using while loop

    #to iterate until user enters q

    while(command != 'q'):

        string=''

        print(menu, end='\n')

        #Prompt the Command

        command = input('Choose an option: ')

        #repeat the loop until user enters a,i,r,c,q commands

        while(command != 'a' and command != 'o' and command != 'i' and command != 'r'

              and command != 'c' and command != 'q'):

            command = input('Choose an option: ')

        #If the input command is a

        if(command == 'a'):

            #call the method to the add elements to the cart

            customer_Cart.add_item(string)

        #If the input command is o

        if(command == 'o'):

            #call the method to the display the elements in the cart

            customer_Cart.output_cart()

        #If the input command is i

        if(command == 'i'):

            #call the method to the display the elements in the cart

            customer_Cart.print_descriptions()

        #If the input command is i

        if(command == 'r'):

            customer_Cart.remove_item()

        if(command == 'c'):

            customer_Cart.modify_item()

# Type main section of code here

#prompt and read the customers name

customer_name = str(input('Enter customer\'s name: \n'))

#prompt the date

current_date = str(input('\nEnter today\'s date: \n'))

#print the name and date

print('Customer name:', customer_name, end='\n')

print('Today\'s date:', current_date, end='\n')

#call the class with the parameters

newCart = ShoppingCart(customer_name, current_date)

#print the details.

print_menu(newCart)