我希望这个程序在用户输入单词 latte 时打印“A latte cost $2.50”

Question

这是我正在做的 Python 编码作业，但我想在项目中做一些额外的事情。我仍处于项目的开始阶段，但我不知道如何打印它。

    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,
}

    def coffee_selection():
        selection = {MENU[coffee_choice]}
        print(f"A {coffee_choice} costs ${selection['cost']}")


    coffee_choice = input("What would you like? (espresso/latte/cappuccino): ")
    coffee_selection()
    if coffee_choice == "report":
        print(f"Water: {resources['water']}ml")
        print(f"Milk: {resources['milk']}ml")
        print(f"Coffee: {resources['coffee']}ml")

理想情况下，对于用户输入的任何输入，我希望程序在用户选择他们想喝的咖啡类型时打印“A {coffee_choice} cost {上面字典中相应的咖啡选择价格}”。

这是我尝试过的代码，但返回时出现 TypeError: unhashable type: 'dict'

    def coffee_selection():
        selection = {MENU[coffee_choice]}
        print(f"A {coffee_choice} costs ${selection['cost  ']}")


    coffee_choice = input("What would you like? (espresso/latte/cappuccino): ")
    coffee_selection()
    if coffee_choice == "report":
        print(f"Water: {resources['water']}ml")
        print(f"Milk: {resources['milk']}ml")
        pint(f"Coffee: {resources['coffee']}ml")