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

Answer 1

'''

Python version : 2.7

Python program to implement a shopping cart

'''

class ItemToPurchase:

               def __init__(self, name='none', price=0, quantity=0, description='none'):

                              self.item_name=name

                              self.item_description=description

                              self.item_price=price

                              self.item_quantity=quantity

                             

               def print_item_cost(self):

                              total = self.item_price * self.item_quantity

                              print('%s %d @ $%d = $%d' % (self.item_name, self.item_quantity, self.item_price, total))

               def print_item_description(self):

                             

                              print('%s: %s' % (self.item_name, self.item_description))

                             

                             

class ShoppingCart:

              

               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        

                             

               def add_item(self, itemToPurchase):

                             

                              self.cart_items.append(itemToPurchase)               

                             

                             

               def get_cost_of_cart(self):

                              total_cost = 0

                              cost = 0

                              for item in self.cart_items:

                                             cost = (item.item_quantity * item.item_price)

                                             total_cost += cost

                              return total_cost

               def print_total():

                              total_cost = self.get_cost_of_cart()

                              if (total_cost == 0):

                                             print('SHOPPING CART IS EMPTY')

                              else:

                                             self.output_cart()                                          

                                            

               def print_descriptions(self):

                             

                              if len(self.cart_items) == 0:

                                             print('SHOPPING CART IS EMPTY')

                              else:

                                             print('\nOUTPUT ITEMS\' DESCRIPTIONS')             

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

                                             print('\nItem Descriptions')

                                             for item in self.cart_items:

                                                            item.print_item_description()

                                                           

                             

               def output_cart(self):

                              print('\nOUTPUT SHOPPING CART')

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

                              print('Number of Items:'+ str(self.get_num_items_in_cart())+'\n')

                              if len(self.cart_items) == 0:

                                             print('SHOPPING CART IS EMPTY')

                              else:      

                                             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)

                                             print('\nTotal: ${}'.format(tc))

                                            

               def remove_item(self, itemName):

                             

                              tremove_item = False

                             

                              for item in self.cart_items:

                                             if item.item_name == itemName:

                                                            self.cart_items.remove(item)

                                                            tremove_item = True

                                                            break

                              if not tremove_item:                                    

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

              

               def modify_item(self, itemToPurchase):  

                             

                              tmodify_item = False

                             

                              for i in range(len(self.cart_items)):

                                             if self.cart_items[i].item_name == itemToPurchase.item_name:

                                                            tmodify_item = True

                                                            if(itemToPurchase.item_price == 0 and itemToPurchase.item_quantity == 0 and itemToPurchase.item_description == 'none'):

                                                                           break

                                                            else:

                                                                           if(itemToPurchase.item_price != 0):

                                                                                          self.cart_items[i].item_price = itemToPurchase.item_price

                                                                           if(itemToPurchase.item_quantity != 0):

                                                                                          self.cart_items[i].item_quantity = itemToPurchase.item_quantity

                                                                           if(itemToPurchase.item_description != 'none'):

                                                                                          self.cart_items[i].item_description = itemToPurchase.item_description

                                                                                         

                                                                           break

                              if not tmodify_item:                      

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

               def get_num_items_in_cart(self):

                              num_items = 0

                              for item in self.cart_items:

                                             num_items = num_items + item.item_quantity

                              return num_items

                             

              

def print_menu(newCart):

               customer_Cart = newCart

               menu = ('\nMENU\n'

                              'a - Add item to cart\n'

                              'r - Remove item from the cart\n'

                              'c - Change item quantity\n'

                              "i - Output item's descriptions\n"

                              'o - Output shopping cart\n'

                              'q - Quit\n')

              

               command = ''

               while(command != 'q'):

                              string=''

                              print(menu)

                              command = raw_input('Choose an option: ')

                              while(command != 'a' and command != 'o' and command != 'i' and command != 'q' and command != 'r' and command != 'c'):

                                             command = raw_input('Choose an option: ')

                              if(command == 'a'):

                                             print("\nADD ITEM TO CART")

                                             item_name = raw_input('Enter the item name: ')

                                             item_description = raw_input('Enter the item description: ')

                                             item_price = float(raw_input('Enter the item price: '))

                                             item_quantity = int(raw_input('Enter the item quantity: '))

                                             itemtoPurchase = ItemToPurchase(item_name, item_price, item_quantity, item_description)

                                             customer_Cart.add_item(itemtoPurchase)

                              if(command == 'o'):

                                             customer_Cart.output_cart()

                              if(command == 'i'):

                                             customer_Cart.print_descriptions()

                              if(command == 'r'):

                                             print('REMOVE ITEM FROM CART')

                                             itemName = raw_input('Enter the name of the item to remove : ')

                                             customer_Cart.remove_item(itemName)

                              if(command == 'c'):

                                             print('\nCHANGE ITEM QUANTITY')

                                             itemName = raw_input('Enter the name of the item : ')

                                             qty = int(raw_input('Enter the new quantity : '))

                                             itemToPurchase = ItemToPurchase(itemName,0,qty)

                                            

                                             customer_Cart.modify_item(itemToPurchase)     

                                            

                                            

if __name__ == "__main__":

               customer_name = raw_input("Enter customer's name:")

               current_date = raw_input("Enter today's date:")

               print("\nCustomer name:"+ customer_name)

               print("Today's date:"+ current_date)

               newCart = ShoppingCart(customer_name, current_date)

               print_menu(newCart)

#end of program                                           

Code Screenshot:

Output: