I need to subtract the ingredients from a coffee (user choice = espresso, latte, cappuccino), which are given in a dictionary, from the base resources that the coffee machine holds (water, coffee, milk). Those resources are given in another dictionary. How can I subtract them from each other, after the user has chosen which coffee to go for?

MENU = {
    "espresso": {
        "ingredients": {
            "water": 50,
            "coffee": 18,
        },
        "cost": 1.5,
    },
    "latte": {
        "ingredients": {
            "water": 200,
            "milk": 150,
            "coffee": 24,
        },
        "cost": 2.5,
    },
    "cappuccino": {
        "ingredients": {
            "water": 250,
            "milk": 100,
            "coffee": 24,
        },
        "cost": 3.0,
    }
}

resources = {
    "water": 300,
    "milk": 200,
    "coffee": 100,
}

From previous lessons, I learned that I need to format the data from the dictionary so that it becomes usable in the code. But I’m at a very beginner level and I’m stuck after formatting the data.

def format_data(choice):
    """Format ingredients into printable format: water, milk, coffee, cost"""
    water = MENU[user_choice]['ingredients']["water"]
    milk = MENU[user_choice]['ingredients']["milk"]
    coffee = MENU[user_choice]['ingredients']["coffee"]
    cost = MENU[user_choice]['ingredients']["cost"]

user_choice = input("What would you like? (espresso/latte/cappuccino").lower()