python_class/Vending_Machine.py at Matrix · harinivbaskar/python_class · GitHub

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#==================================================================
# Global Variables
#==================================================================

vending_machine = {
    "Chips" : {
        "quantity" : 20,
        "price" : 2.00
    },
    "Soda" : {
        "quantity" : 30,
        "price" : 1.50
    },
    "Gum" : {
        "quantity" : 40,
        "price" : 0.75
    },
    "Candy" : {
        "quantity" : 40,
        "price" : 0.50
    },
    "Water" : {
        "quantity" : 30,
        "price" : 1.00
    },
}
#==================================================================
# Functions
#==================================================================
def insert_money():
   enter_in_money = f"\nEnter the money you would like to spend: "
   price = int(float(input(enter_in_money)))

   while price <= 0:
        print(f"\nERROR: {price} is less than or equal to 0!\n")
        price = int(float(input(enter_in_money)))

   return price

def get_menu(vending_machine):
    items = list(vending_machine.keys())
    items.insert(0, "")

    menu = '''
    The Menu
================
'''

    for item in items:
        index = items.index(item)

        if item == "":
            continue

        menu += f"{index}. {item}\n"

    menu += f"\nEnter you choice [1 - {len(items)-1}]: "

    return menu

def get_user_choice(vending_machine):
    items = list(vending_machine.keys())
    items.insert(0, "")

    last_index = len(items)-1


    # get the choice of items
    menu = get_menu(vending_machine)

    user_choice = int(float(input(menu)))

    while not 1 <= user_choice <= last_index:
        print(f"\nERROR: {user_choice} is an invalid choice!\n")
        user_choice = int(float(input(menu)))

    # get quantity
    item = items[user_choice]
    available_quantity = vending_machine.get(item).get("quantity")

    quantity = int(float(input(f"Enter the quantity [1 - {available_quantity}]: ")))

    while not 1 <= quantity <= available_quantity:
        print(f"\nERROR: {quantity} is an invalid quantity!\n")
        quantity = int(float(input(f"Enter the quantity [1 - {available_quantity}]: ")))

    return (item, quantity)


def purchase_items():
    shopping_list = dict()

    more_items = "y"
    while more_items.lower() ==  "y":
        (item, quantity) = get_user_choice(vending_machine)
        print(item, quantity)

        # Update Shopping List
        if item in shopping_list.keys():
            shopping_list[item] = shopping_list[item] + quantity
        else:
            shopping_list[item] = quantity

        more_items = input("Would you like to buy more items? (y/n): ")

    return shopping_list

#==================================================================
# Main Program starts here
#==================================================================
insert_money()


shopping_list = purchase_items()
print(shopping_list)