Question

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

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 = '{}: {}, %d oz.'.format(self.item_name, self.item_description, self.item_quantity)
        print(string)
        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):
        print('ADD ITEM TO CART')
        #prompt the name and description of item,price and Quentity
        item_name = str(input('Enter the item name:'))
        print()
        item_description = str(input('Enter the item description:'))
        print()
        item_price = int(input('Enter the item price:'))
        print()
        item_quantity = int(input('Enter the item quantity:'))
        print()

        #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('REMOVE ITEM FROM CART')

        #prompt the item to remove the list
        string = str(input('Enter name of item to remove:'))
        print()
        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]
                #set the flag value to true
                #break from the list
                flag=True
                break

            #Otherwiese set value to false
            else:
                flag=False
            i += 1

        #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('CHANGE ITEM QUANTITY')

        #Prompt the input item
        name = str(input('Enter the item name:'))
        print()

        #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:'))
                print()
                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.')
        print()

    #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(self):
        total_cost = self.get_cost_of_cart()
        if (total_cost == 0):
            print('SHOPPING CART IS EMPTY')
        else:
            self.output_cart()

    #Implement the method to print_descriptions      
    def print_descriptions(self):
        print('OUTPUT ITEMS\' DESCRIPTIONS')
        print('{}\'s Shopping Cart - {}'.format(self.customer_name, self.current_date),end='\n')
        print('\nItem Descriptions')

        for item in self.cart_items:
            print('{}: {}'.format(item.item_name, item.item_description))

    #Implement the method output_cart()
    def output_cart(self):
        print('OUTPUT SHOPPING CART')
        print('{}\'s Shopping Cart - {}'.format(self.customer_name, self.current_date))      
        print('Number of Items:', self.get_num_items_in_cart())
        print()
        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)))
            tc += (item.item_quantity * item.item_price)
        
        if len(self.cart_items) == 0:
            print('SHOPPING CART IS EMPTY')
        print()

        print('Total: ${}'.format(tc))

#Implement the method print_menu
def print_menu(customer_Cart):

    #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'):
        print(menu)

        #Prompt the Command
        command = input('Choose an option:')
        print()

        #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:')
            print()

        #If the input command is a
        if(command == 'a'):
            #call the method to the add elements to the cart
            customer_Cart.add_item()

        #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()

def main():
    # Type main section of code here
    #prompt and read the customers name
    customer_name = str(input('Enter customer\'s name:'))
    print()

    #prompt the date
    current_date = str(input('Enter today\'s date:'))
    print('\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)

if __name__ == '__main__':
    main()

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