import os

#create shopping list with automatic calculation


def display_help():
    print('''
    =======> Help <=======
    'HELP' to display this menu
    'START' to start creating your shopping list
    'SHOW' to display your current items
    'QUIT' to exit the program
    ''')
#create a list with the items needed
#

def clear_screen():
    os.system("cls" if os.name == "nt" else "clear")



#Create function to change values of current items or update price of items in the cart



def shopping_list():
    clear_screen()
    print('It's time to go shopping!')
    #Convert all floating point numbers to max digits of 2 after the decimal
    clear_screen()
    item_dict = {}
    print('Enter HELP at any moment if you need help or EXIT to return to the main menu')
    cart = 0
    def show_items():
        for key, value in item_dict.items():
            print(key + '-' * 5 + str(value))
        print('Current cart total: ',sum(item_dict.values()))
    while True:
        shop = input('Please enter an item: ')
        if shop.upper() == 'HELP':
            display_help()
            continue
        elif shop.upper() == 'EXIT':
           #Show total with taxes (or without taxes) with all the items in cronological order
           #start without taxes first
           print("Goodbye")
           break
        elif shop.upper() == 'SHOW':
            show_items()
            continue
        print(f'You have added {shop} to your listn')
        try:
            cost = float(input(f'Price of {shop}: '))
            item_dict[shop] = cost
            cart = sum(item_dict.values())
            print(f'You entered {cost} as the price of {shop}n')
            print(f'You now have {len(item_dict)} items in your list.n')
            print(f'The total currently on your cart is {cart}')
            add_more_items = input('Would you like to add more items?(Y/N) ')
            if add_more_items == 'Y'.lower():
                continue
            else:
                print(f'Here's your cart and your total: n')
                raise KeyboardInterrupt('Goodbye')
                continue
        except ValueError:
            print('Please enter a number')



def begin_attempt():
    print('Here's a list of possible commands: HELP, SHOP, EXIT')
    print('Welcome! What would you like to do?')
    while True:
        choose = input('> ')
        if choose.upper() == 'SHOP':
            print('Shopping has begunn')
            shopping_list()
        elif choose.upper() == 'HELP':
            display_help()
            continue
        elif choose.upper() == 'EXIT':
            print("Goodbye")
            break

begin_attempt()