Question

7.11 LAB: Online shopping cart - Part 2 This program extends the earlier "Online shopping cart" program. (Consider first saving your earlier program). (1) Extend the ItemToPurchase namedtuple to contain a new attribute. (2 pts) item_description (string) - Set to "none" in the construct_item() function Implement the following function with an ItemToPurchase as a parameter. print_item_description() - Prints item_name and item_description attribute for an ItemToPurchase namedtuple. Has an ItemToPurchase parameter. Ex. of print_item_description() output: Bottled Water: Deer Park, 12 oz. (2) Build a ShoppingCart namedtuple with the following data attributes and related functions. Note: Some can be function stubs (empty methods) initially, to be completed in later steps. Create a namedtuple named ShoppingCart which has the customer name. date, and cart items as attributes (2 pts) customer_name (string) current_date (string) cart_items (list) Write a function named construct_cart() for ShoppingCart that creates a named tuple with the following specifications: (1 pt) Initializes customer_name = "none", current_date = "January 1, 2016", cart_items to an empty list Functions: add_item() Adds an item to cart_items list. Has parameters ShoppingCart and ItemToPurchase. Does not return anything. remove_item() Removes item from cart_items list. Has a ShoppingCart and a string (an item's name) as parameters. 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 parameters ShoppingCart, and 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 a ShoppingCart as a parameter. get_cost_of_cart() (2 pts) Determines and returns the total cost of items in cart. Has a ShoppingCart as a parameter. print_total() Outputs total of objects in cart. Has a ShoppingCart as a parameter. If cart is empty, output this message: SHOPPING CART IS EMPTY print_descriptions() Outputs each item's description. Has a ShoppingCart as a parameter. 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 Hints Use the __main__ statement whenever appropriate. Read section 2.5 - "Importing modules and executing scripts " if you are not familiar with this.

Answer 1

#Declare the class ItemT°Purchase 3 class ItemToPurchase: 4 #Parameter Constructor 'none'); item-description = item-price-0, item-quantity-0, item-name-' none', def-init-(self, 7 self.item_nameitem_name 10 self.item_price -item_price 12 13 self.item quantity item quantity 14 self.item_description -item_description 15 16 17 18 19 #Implement the method 20 def print_item_.cost(self): 21- #print the output in a specifed format 23 24 $$.format (self.item_name, self.item_quantity, self.item_price, string 25 26 27 28 29 30 (self.item_quantity self.item_price)) cost self.item_quantity self.item_price return string, cost 31

32 #Implement the method print-item-description 34 35 def print item_description(self): 36 string: '.format (self.item_name, self.item_description) 37 38 39 40 41 print(string, end-'n') return string 42 43 #Declare the class ShoppingCart 45-class ShoppingCart: 46 47 48 #Parameter Constructor 49. 50 det-initー(self, 'none', current-date 'January 1, 2016', cart-items O): customer-name- = - 51 52 self.customer_name customer_name 53 self.current date current_date 54 self.cart items cart_items 56 57 #Implement method to add item in the shopping cart 58 59 def add item(self, string): 60 61 62 print(' nADD ITEM TO CART', end-'n'

63 64 65 #prompt the name and description of item,price and Quentity item_name strCinput('Enter the item name:) 67 68 item_description str(input('nEnter the item description: item_price intCinput'InEnter the item price: ) 69 70 71 72 73 74 75 76 item_quantity int input( nEnter the item quantity: #Append the above values in to the list self.cart items.append(ItemToPurchaseCitem-name, item_price, item_quantity, item_description).) #Implement the method to delete the item in the cart 78 79 80 81 82 83 84 def remove item(self): print('InREMOVE ITEM FROM CART', end-'In #prompt the item to remove the list string str(input('Enter name of item to remove: ) 85 86 87 89 90 91 92 93 #Using for-loop to iterate every item for item in self.cart_items: #If item found delete in the list

94 95 96 ifCitem.item_name string): del self.cart_items Ci] 97 98 100 101 #set the flag value to true 102 103 104 105 106 107 #break from the list flag-True break 108 109 110 #Otherwiese set value to false else: 112 113 114 115 116 flag-False #IF the value not found if(flag-False): 118 119 120 121 122 123 #print the message print('Item not found in cart. Nothing removed) #Implement the method modifyitem to chane the Quantity 124

def modify_item(self): 125 126 127 128 129 130 print('InCHANGE ITEM QUANTITY', end-'In' #Prompt the input item name strCinputC'Enter the item name: ) 131 132 133 134 #Using for-loop to iterate every item for item in self.cart_items: 135 136 137 #If item found update Quantity in the list 138 139 140 141 142 143 144 if(item.item_namename): quantity int(input('Enter the new quantity: ) item.item quantity quantity #set the flag value to true 145 146 147 148 149 150 151 152 153 154 #break from the list flag-True break #Otherwiese set value to false else:

156 157 158 159 160 flag-False #IF the value not found if(flag-False): 161 162 163 164 165 166 167 #print the message print('Item not found in cart. Nothing modified #implement method to compute total number of items in the cart 168 169 170 def get_num_items in_cart(self): num items-0 172 173 174 #Using for-loop to iterate the cart for item in self.cart_items: 175 176 #ADD the Quantities 178 179 180 181 182 183 184 185 num_items- num-items+item.item_quantity #return the num-items return num_items #Implement the method

186 def get_cost_of_cart(self): 187 188 189 190 191 total_cost0 cost-0 192 193 194 195 196 197 #Using for-loop to iterate the list #mulitply the price and Quantity #add value to the Total.Cost 198 199 for item in self.cart_items: 200 201 cost (item.item_quantity item.item_price) 202 203 204 205 total_cost + cost #return the value 206 return total_cost 207 208 209 210 211 212 213 214 215 216 #Implement the method to print the total def print_totalO: total_cost- get_cost_of_cartO 0): (total-cost if -

print('SHOPPING CART IS EMPTY") 217 218 219 220 221 eLse: output_cartO #Implement the method to print-descriptions 223 224 225 def print_descriptions(self): 226 print('nOUTPUT ITEMS' DESCRIPTIONS') 227 228 229 print(''s Shopping Cart .format (self.customer_name, self.current_date),end-'n) 230 231 232 233 234 235 236 print('\nItem Descriptions', end-\n') for item in self.cart_items: .format(item.item_name, item.item_description), end-'n') print(' #Implement the method output-cart() 237 238 239 240 241 242 def output_cart(self): new-ShoppingCartO print('nOUTPUT SHOPPING CART, end-'In') 243 244 print(''s Shopping Cart .format (self.customer_name, self.current_date),end-'n) 245 246 247 print('Number of Items:', new.get_num_items in_cartO, end-nn')

248 249 250 251 252 253 tc 0 for item in self.cart.items: print('{} {} @ ${} = ${}'.forma (item.iten_name, item. item-quantity, 254 255 item.item_price, (item.item_quantity item.item_price)), end-n') 256 257 (item . item-quantity item. item_p rice) tc 258 259 260 print('InTotal: $.format (tc), end-'In 261 #Implement the method print-menu 262 263 def print_menu(ShoppingCart): 264 265 266 267 customer Cart newCart string- 268 269 270 271 menu C'nMENUn 272 273 274 275 276 277 #declare the string menu a -Add item to cartn r - Remove item from cartn c -Change item quantity n 278

279 280 281 282 iOutput items\' descriptions\n' 'o - Output shopping cart\n' q - Quitln') 283 284 285 command 286 287 #Using while loop 288 289 #10 iterate until user enters q 290 291 while(command'q'): 292 293 294 295 string-' print(menu, end-n 296 #Prompt the Command 297 298 299 300 301 command inputC'Choose an option: #repeat the loop until user enters a,i, r, c, q commands 302 303 304 while(command ! 'a' and command != 'o' and command != 'i' and command != 'r' and commandc' and command-"q'): 305 306 command inputC'Choose an option: " 307 308 309 #If the input command is a

310 311 312 313 i f(commanda'): #call the method to the add elements to the cart 314 315 316 317 318 319 customer_Cart.add_item(string) #If the input command is o i f(commando: 320 321 #call the method to the display the elements in the cart 322 323 324 325 326 327 328 329 330 331 customer_Cart.output_cartO #If the input command is i i f(commandi'): #call the method to the display the elements in the cart customer_Cart.print_descriptionsO 332 #If the input command is 334 335 336 337 338 339 340 i f(commandr: customer_Cart.remove_item i f(commandc:

340 341 342 343 # Type main section of code here 344 customer_Cart.modify item) 345 #prompt and read the customers name 346 347 customer_name-str input('Enter customer\'s name: n)) 348 349 #prompt the date 350 351 current_date str(inputC'nEnter today\'s date: \n')) 352 353 #print the name and date 354 355 print('Customer name:', customer_name, end-'n) 356 357 print('Today\'s date:', current_date, end-'In) 358 359 #call the class with the parameters 360 361 362 ShoppingCart(customer_name, current-date) nema rt = 363 #print the details. 364 365 print_menu(newCart) 366 367
OUTPUT WILL BE:

Enter customer s name: deepak Enter today's date: 26-05-2019 Customer name: deepak Today's date: 26-05-2019 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: