Question

Need help solving this qestion related to object and item classes involving arrays in PYTHON.

Classes and Object - Inventory Item as Object                   

In this assignment the idea is to use an Item class to capture what you need for recording and displaying the details of an order from an online store like Amazon. This is a Class and Object assignment.

For the assignment you must define and implement the Item class so that the code shown immediately below can produce the result shown below that. You will need to define the four private variables of the Item class for the price, weightInOunces , description, and quantity.

You are to include a constructor (__init__), that takes three input parameters for the price, weightInOunces, and description, but not quantity which should be set to a default value of 1

You will also need to create the remaining methods that are used in the code below the gets and sets. The contents of the main function and the output are shown below. Copy, and do not change, the code below. Pay close attention to the values in the output. If you do not match the details correctly, some of your values will not be the same as those shown. (Hint: There’s a reason that the getOrderPrice() method is not called getPrice() and in the example it affects the order for glasses.) Name your main file youOrderReceipt.py, e.g. StudentNameOrderReceipt.py.

Part B:

Create a second main file youOrderReceiptArray.py e.g. AjoyOrderReceiptArray.

Using an list of item objects, instead of item1, item2, etc. Put item1 item2, item3 and item4 in the list. For each item in the list call __str__() and Use the list and the for loop to find the dTotalPrice and iTotalWeight as in part A.

Turn in your zipped package folder with all the three .py source files(Item.py and the two main files). Having correct formatting will now be part of the grade.

def main():

    dTotalPrice = 0.0        

    iTotalWeight = 0

    # Put the 4 items being ordered in item1 through item 4        

    item1 = Item.Item(24.99, 14, "Wireless Mouse")        

    item2 = Item.Item(22.49, 27, "USB Keyboard")        

    item3 = Item.Item(24.99, 12, "HDMI Cable")        

    item4 = Item.Item(7.99, 7, "Reading Glasses")        

    item4.set_quantity(2);  

         

    # Show the details of the order using show()        

    print("Here are your shopping cart contents.")        

    print(item1);        

    print(item2);       

    print(item3);        

    print(item4);

         

    # Compute the total price and total weight in this section       

    dTotalPrice += item1.getOrderPrice()        

    dTotalPrice += item2.getOrderPrice()        

    dTotalPrice += item3.getOrderPrice()        

    dTotalPrice += item4.getOrderPrice()        

    iTotalWeight += item1.getOrderWeightInOunces()       

    iTotalWeight += item2.getOrderWeightInOunces()        

    iTotalWeight += item3.getOrderWeightInOunces()        

    iTotalWeight += item4.getOrderWeightInOunces()        

    # Here we show the order details       

    print("The price of your order is $" + str(dTotalPrice));        

    print("The shipping weight is", (int)(iTotalWeight / 16),

          "pounds", iTotalWeight % 16 , "ounces");    

   

main()  

The method __str__() should print out as shown below for each item.

$24.99 each for 1 Wireless Mouse.

$22.49 each for 1 USB Keyboard.

$24.99 each for 1 HDMI Cable.

$7.99 each for 2 Reading Glasses.

Answer 1

to achieve above tasks we can follow below steps :

1. create a class name Item
2. create a constructor (__init__) to initialize the members.
3. create getter and setters for the variables as the variables are private members.

the below code will explain better :

the text code :

class Item:
    def __init__(self , price , weightounces , description):
        self.__price = price #private members satrt with __
        self.__weightounces = weightounces
        self.__description = description
        self.__quantity = 1

    def set_price(self ,price):    #setter functions for 4 memebers
        self.__price = price
    def set_weightounces(self ,weight):
        self.__weightounces = weight
    def set_description(self, des):
        self.__description = des
    def set_quantity(self ,quantity):
        self.__quantity = quantity

    def getOrderPrice(self):    #getter functions for ll variables.
        return self.__price
    def getOrderWeightInOunces(self):
        return self.__weightounces
    def getDescription(self):
        return self.__description
    def getQuantity(self):
        return self.__quantity

    def __str__(self):    #__str__ modifier function to return a string whenever the print fucntion will call th eobject itself.
        return f'${self.__price} each for {self.__quantity} {self.__description}'

def main():

    dTotalPrice = 0.0

    iTotalWeight = 0

    # Put the 4 items being ordered in item1 through item 4

    item1 = Item(24.99, 14, "Wireless Mouse")

    item2 = Item(22.49, 27, "USB Keyboard")

    item3 = Item(24.99, 12, "HDMI Cable")

    item4 = Item(7.99, 7, "Reading Glasses")

    item4.set_quantity(2);

    # Show the details of the order using show()

    print("Here are your shopping cart contents.")

    print(item1);

    print(item2);

    print(item3);

    print(item4);
    # Compute the total price and total weight in this section
    dTotalPrice += item1.getOrderPrice()

    dTotalPrice += item2.getOrderPrice()

    dTotalPrice += item3.getOrderPrice()

    dTotalPrice += item4.getOrderPrice()

    iTotalWeight += item1.getOrderWeightInOunces()

    iTotalWeight += item2.getOrderWeightInOunces()

    iTotalWeight += item3.getOrderWeightInOunces()

    iTotalWeight += item4.getOrderWeightInOunces()
    # Here we show the order details
    print("The price of your order is $" + str(dTotalPrice));

    print("The shipping weight is", (int)(iTotalWeight / 16),

          "pounds", iTotalWeight % 16 , "ounces");
    print('***********************')
    print("List implementation ")

    item_list = [item1 , item2 , item3 , item4]   #create a list of items.
    for x in item_list: #iteratively print all the 4 objects
        print(x)

main()