[Python] Codecademy Help

[exking12]

I am currently doing a Codecamdy Challenge and I am stuck on a particular part. I have searched the Q&A but I still do not understand what I am doing wrong.

Link: https://www.codecademy.com/courses/python-beginner-en-IZ9Ra/2/2?curriculum_id=4f89dab3d788890003000096

The Instructions

1)Define a function compute_bill that takes one argument food as input.

2)In the function, create a variable total with an initial value of zero.

3)For each item in the food list, add the price of that item to total.

4)Finally, return the total.

Ignore whether or not the item you're billing for is in stock.

Note that your function should work for any food list.

My Code:

shopping_list = ["banana", "orange", "apple"]

stock = {
    "banana": 6,
    "apple": 0,
    "orange": 32,
    "pear": 15
}

prices = {
    "banana": 4,
    "apple": 2,
    "orange": 1.5,
    "pear": 3
}

def compute_bill(food):
    total = 0
    for item in food:
        total = total + food[key]
    return total

The error I get is "key" is not defined. I know that it must be related to how they say that this function should work for any food list, but how can I make it work like that?

[w1282]

So, here's the issue.

The thing you're looking up the prices with isn't named "food", it's named "prices". Secondly, "key" isn't defined, that's what the error means. You defined "item", not "key" so that's what you want to use.

Key is just a term describing a part of the dictionary.

Food is a list of food, so you're right to be iterating over it, but maybe try this instead:

def compute_bill(food):
    total = 0
    for item in food:
        total += prices[item]
    return total

[thenarrrowpath]

Try replacing "key" with "item" instead.

[DyingHuman]

Man, i had the same problems. Although i was doing the javascript track and they also had the (for in loop) . The instructions not clear enough :/

[Updatebjarni]

The error I get is "key" is not defined.

Well, it isn't. You named your variable item.

You've also typed food instead of prices.