follow the instructions and this is the test script to follow: In this assignment you are to create a class called Cart that will model the operation of an on-linestore shopping cart. A Cart object, once created, will hold items selected by an on-line shopper.When the shopper is finished, the Cart object will be used to perform a checkout for the shopper.The Cart class is to be created with the following methods and attributes:MethodPurposeInputOutput/returnsNameConstructor - sets the customer name forthe cart and maintains a cart sequencenumber. The first cart is #1, the second is#2, etc.If the object passed is not type 'Item',return False and 'not an Item type'One Cart classobjectinitThe name of theshopper orcustomer(type string)One item objectaddltemTrue plus 'added'orFalse plus 'not anItem type'If the item is not in the Cart, add the objectand the quantity of 1, return True and'added'.If the item is already in the Cart, add 1 tothe quantity, return True and 'added'checkoutPrint a heading line for the receipt,including the customer name and cartNonePrints a checkoutreceipt for theCart, includingcustomer name,number.Iterate through the Cart contents, printeach item, the quantity, and extendedprice (qty x unit price).Print a total line at the end with the totalcart number, eachitem qty, andprice, and totalpriceprice for all items in the cart.AttributeТуреDefinition (note: double underscore protection is not needed)The name of the customer shopper, passed to the Cart constructorwhen the Cart object is createdSequence number for the Cart object – starts as 1 for cart #1, then 2,3, etc. This is not an input, but is maintained by the Cart class.Holds the contents of the cart. The key is the name of the Itemobject added, which will be supplied by the Item object (i.e.item_object.name). The corresponding value is a list with two things:(1) the quantity of that particular item in the cart (integer), and (2) theobject id of the Item being added.custNamestrseqNointcontentsdictA simple Item class definition is provided with the assignment for you to use to hold items. It only hasa constructor method and two attributes: name (str) and price (float). 'name' is used as the dictionarykey inside cart. 'price' is the unit price for one of the items (i.e. 1.99 is the cost of one carton of eggs).The most difficult part of this Lab is creating and using the self.contents dictionary inside the Cart class. The constructor only creates a blank dictionary when the Cart object is created. The 'addltem'and 'checkout' methods need to maintain and use it.As an example, when item objects i1 ('milk', 3.99), i2 ('eggs', 1.99), and i3 ('wine', 9.50) are added,the dictionary contents will be:self.contents = { 'milk': [1, ], 'eggs': [1, ], 'wine': [1, ] }The 'addltem' method checked to see if the item name is in the dictionary. If not, it adds each of theabove to the dictionary.If Item object i4 ('eggs', 1.99) is then added, the dictionary becomes:self.contents = { 'milk': [1, ], 'eggs': [2, ], 'wine': [1, ] }In this case the 'addltem' method found that 'eggs' was already a key in the dictionary and onlyupdated the quantity by adding one. The 'object id' did not need to be updated since it is a duplicateof the one previously added. Note that items can only be added to the Cart one at a time. There isno provision for adding 2, 3, or more of a given item at once.The 'checkout' method prints a receipt for the cart contents. It prints a title line showing the customername and cart number, then iterates through the cart dictionary and prints a line for each item (name,quantity, and extended price), and a total line at the bottom showing the total cost for all items in thecart. Here's an example:Checkout for Mary SmithCart# 1milk$$$ 9.5013.9923.98eggssalmon1Total$ 17.47

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Answers

The Python Code for the given problem is:

# class Item
class Item:
    def __init__(self, name, price) -> None:
        # constructor with item name and price
        self.name = name
        self.price = price

class Cart:
    # static variable to store count of carts
    counter = 1
    # constructor of cart, takes customer name and initialize members
    def __init__(self, customer_name) -> None:
        self.custName = customer_name
        self.seqNo = '# ' + str(Cart.counter)
        self.contents = {}
        Cart.counter = Cart.counter + 1

    # add anitem to contents dictionary
    def addItem(self, anItem):
        # check if anItem is of type Item, else return false
        if not isinstance(anItem, Item):
            return False, 'not an item type'
        
        # if item is not in dictionary already, add it with quantity 1
        # else increase the quantity of item by 1
        if anItem.name not in self.contents.keys():
            self.contents[anItem.name] = [1, anItem]
        else:
            self.contents[anItem.name][0] = self.contents[anItem.name][0] + 1
        return True, 'added'
    
    # prints the reciept of cart
    def checkout(self):
        total = 0
        print('Checkout for %s \tCart %s\n'%(self.custName, self.seqNo))
        for key, value in self.contents.items():
            print("%s \t\t\t%d\t$\t%.2f\n"%(key, value[0], value[1].price * value[0]))
            total = total + (value[0] * value[1].price)
        print("Total \t\t\t\t$\t%.2f\n"%(total))

# test data

item1 = Item('milk', 3.99)
item2 = Item('eggs', 1.99)
item3 = Item('salmon', 9.50)

aCart = Cart('Marry Smith')
aCart.addItem(item1)
aCart.addItem(item2)
aCart.addItem(item2)
aCart.addItem(item3)

aCart.checkout()

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