Simulating A Supermarket Self-Service Checkout With Python 3

Design and model two classes: Product and CheckoutRegister

Insert your list/table of possible product properties here…

Product Properties (All)

price	mfgDate	expiryDate Save Time On Research and Writing Hire a Pro to Write You a 100% Plagiarism-Free Paper. Get My Paper	BatchNo
weight	barcode	name	ingredients
address	email	mfgUnit	fax

Insert your list/table of key product properties here…

Product Properties (Key)

name

price

weight

barcode

Complete the class diagram of your final Product class here 

Update the below code to insert comments describing what the code is doing – for each line starting with a hash symbol (#) you should write your code comments after the hash. You may add a second line of comments if you require more space.

# Function to: read a float value from the user

#and return this float value to the calling function

def get_float(prompt): 

    # take a variable value of type float and initialize it
    # with value 0.0

    value = float(0.0)

    # infinite loop to carry on till a valid float value is entered by the user

    while True:

        try:

            # take an input from the user

            # typecast that entered value into a float value

            value = float(input(prompt)) 

            # if value was successfully parsed

            # but the entered value is less then 0,

            # print an error message and continue to loop

            if value < 0.0:

                print(“We don’t accept negative money!”)

                continue

            # value entered by the user is a valid value.

            # break the loop

            break 

        # value entered by the user was not a valid float value

        # so an exception is thrown

        except ValueError:

            print(‘Please enter a valid floating point value.’)

    # return the parsed float value to the calling function.

    return value

# Function to: bag the products that are purchased by the user

def bag_products(product_list):    
    # list of the bags as the items purchased by the user

    # may take more then one bags

    bag_list = []

    non_bagged_items = []

    MAX_BAG_WEIGHT = 5.0

    # for each product in the list of goods purchased by the user

    # perform this loop

    for product in product_list

        # weight of current product is more then

        # the maximum weight that this bag can hold,

        # so add this product to the list of items which will not be bagged

        if product.weight > MAX_BAG_WEIGHT:

            product_list.remove(product)

            non_bagged_items.append(product)

    # take an empty new bag to place the goods of the user

    current_bag_contents = []

    current_bag_weight = 0.0

    # loop until the basket of goods purchased by the user still has items

    while len(product_list) > 0:

        # take the first products out of the basket

        # and name it as temp_product

        temp_product = product_list[0]

        product_list.remove(temp_product)

        # check whether the current product can be added

        # to the current bag or not

        # for this, check that adding this product will not overfloew the bag

        if current_bag_weight + temp_product.weight < MAX_BAG_WEIGHT:        

            # if this product can be added, add it to the current bag

            current_bag_contents.append(temp_product)

            current_bag_weight += temp_product.weight            

            # if all the items of the basket are packed

            # add this bag to list of bags for the user

            if (len(product_list) == 0):

                bag_list.append(current_bag_contents)                

        # the current product can not be added to this bag,

        # so add the current bag to the list of bags for the user

        else:

            bag_list.append(current_bag_contents)

            # take a fresh bag and set its weight to 0

            current_bag_contents = []

            current_bag_weight = 0.0

    # loop through list of all bags to print their contents

    # by bag number

    for index, bag in enumerate(bag_list):

        output = ‘Bag ‘ + str(index + 1) + ‘ contains: ‘

        # for each product in the current bag, add its name

        # to the list of user items in this bag

        for product in bag:

            output += product.name + ‘t’

        print(output, ‘n’)

    # there are also some items that were not packed

    if (len(non_bagged_items) > 0):

        output = ‘Non-bagged items: ‘

        # traverse these items to print their contents

        for item in non_bagged_items:

            output += item + ‘t’

        print(output,’n’)