Please either post all 3 different codes for RetailItem Class, CashRegister Class and Main Function, or complete the two sets of code down below. Thanks

1. Create a class named RetailItem that holds data about an item in a retail store. The class should store the following data attributes: item description, units in inventory, and price.

Please define the 3 data attributes as private attributes and name them as description, inventory, and price.

Please define the initialization method __init__

Please define the corresponding accessor and mutator methods.

Please override the __str()__ method, which summarizes all data fields of the class.

Please save this class as a separate python module.

2. Create a CashRegister class that can be used with the RetailItem class. The CashRegister class has a private data attribute named as items, which is a list object that is used to internally keep a list of RetailItem objects.

The class should have the following methods: A method named purchase_item that accepts a RetailItem object as an argument. Each time the purchase_item method is called, the RetailItem object that is passed as an argument should be added to the list.

A method named get_total that returns the sum of price of all the RetailItem objects stored in the CashRegister objects internal list.

A method named show_items that displays data about the RetailItem objects stored in the CashRegister objects internal list.

A method named clear that should clear the CashRegister objects internal list.

3. Demonstrate the CashRegister class in a hw4.py program that allows the user to select several items for purchase. When the user is ready to check out, the program should display a list of all the items he or she has selected for purchase, as well as the total price.

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Here is the code for HW4Starter

# define and run the main method to demonstrate the CashRegister class

# first, you need to import the other two modules

# define Constants to hold the options of purchase items

PANTS = 1

SHIRT = 2

DRESS = 3

SOCKS = 4

SWEATER = 5

# main method

def main():

# Create sale items. For example:

# if the RetailItem class is in the retail module, enter the following

# pants = retail.RetailItem('Pants', 10, 19.99)

# shirt = retail.RetailItem('Shirt', 15, 12.50)

# dress = retail.RetailItem('Dress', 3, 79.00)

# socks = retail.RetailItem('Socks', 50, 1.00)

# sweater = retail.RetailItem('Sweater', 5, 49.99)

# complete the code to define the 5 sale items here using sample data in the example above

pants =

shirt =

dress =

socks =

sweater =

# Create dictionary of sale items.

sale_items = {PANTS:pants, SHIRT:shirt,DRESS:dress, SOCKS:socks,

SWEATER:sweater}

# Create a cash register object

# complete the code here

# Initialize loop test.

checkout = 'N'

# keep looping if user wants to purchase more items:

while checkout == 'N':

# call the get_user_choice() function to let user pick a sale item

# complete the code here:

# use the choice selected by the user to locate the sale item from the

# sale_items dictionary and assign it to a variable called item

# complete the code here:

item = sale_items[]

if item.get_inventory() == 0:

print('The item is out of stock.')

else:

# add the item to the cash register object created before the while loop

# complete the code here:

# update item by reducing the inventory number by 1 and assign it to variable new_item

# for example: if the RetailItem class is in the retail module, the code will be:

# new_item = retail.RetailItem(item.get_description(), \

# item.get_inventory()-1, \

# item.get_price())

# complete the code here:

new_item =

# assign this new_item as the new value to the selected key of the sale_items dictionary

# complete the code here

sale_items[] = new_item

# ask user to checkout or continue

checkout = input('Are you ready to check out (Y/N)? ')

# here is outside the while loop

# print out the total price of the cash register

# complete the code here:

print('Your purchase total is: ',)

# display items in the cashregister by calling the proper method

# complete the code here:

# now you can clear the items of the cashregister by calling the proper method

# complete the code here:

def get_user_choice():

print('Menu')

print('---------------------------------')

print('1. Pants')

print('2. Shirt')

print('3. Dress')

print('4. Socks')

print('5. Sweater')

print()

while True:

try:

choice = int(input('Enter the menu number of the item ' + \

'you would like to purchase: '))

while choice > SWEATER or choice < PANTS: # what you're testing here?

choice = int(input('Please enter a valid item number: '))

print()

return choice

except ValueError as err:

print(err)

print('Please enter a number from the menu!')

# Call the main function.

main()

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Here is the code for cashRegisterStarter

#define the CashRegister class here

#hint: first, you need to import the module that contains the RetailItem class

class CashRegister:

# Initialize an empty list called items to hold purchased items.

def __init__(self):

self.__items = []

# Method that clears the contents of the cash register.

def clear(self):

#complete this method

# Method that simulates adding an item to the cash register.

# It receives a RetailItem object as an argument.

def purchase_item(self, retail_item):

#hint: call the list class' append method to

#add the retail_item to the end of the list

#Complete the method

print('The item was added to the cash register.')

# Method returning the total cost of items in the list.

def get_total(self):

total = 0.0

#hint: use a for loop to loop through the list and

#add the each item's price to total

#Complete the method

return total

# Method that prints all the items in the list.

def show_items(self):

print('The items in the cash register are:')

#hint: use a for loop to loop through the list and

#print one item in each iteration

#Complete the method

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