How can I print the number of unique elements in a list?

[Fre3k]

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Using the dictionary below, I'm supposed to create a function that returns the number of unique items in the "items" list.

shopping_cart = {
    "tax": .08,
    "items": [
        {
            "title": "orange juice",
            "price": 3.99,
            "quantity": 1
        },
        {
            "title": "rice",
            "price": 1.99,
            "quantity": 3
        },
        {
            "title": "beans",
            "price": 0.99,
            "quantity": 3
        },
        {
            "title": "chili sauce",
            "price": 2.99,
            "quantity": 1
        },
        {
            "title": "chocolate",
            "price": 0.75,
            "quantity": 9
        }
    ]
}

I've created the code below which outputs the number of items (5), but I need the code to only count unique items. For example, if two items in this list were identical, it should return 4 (since only 4 items would be unique in that case). How can I accomplish this?

def get_tax_rate(d):
    print (d['tax'])

Output:
5

Good morning,

Well as all above already mentioned, is your output not that what it should be / expect from your code :)
with

print(d['tax']

You only get the the value from the value "tax" in your dict.

Here is a short example how you can access/work through a nested-dict !

config = {
    "username": "user",
    "password": "password",
    "server": "https://website.de",
    "headers": {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:44.0) Gecko/20100101 Firefox/44.0",
        "Connection": "keep-alive"
    }
}

print(config['headers']['User-Agent'])

Will output:

Output:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:44.0) Gecko/20100101 Firefox/44.0

You can count all items(key/value pairs) from a dict with the len() function
Here (How to find length of dictionary values) you have a pretty decent example, which is actually part of that what you need.



Now you only need to call your created function the right way ( with the correct parameter " d " )


All the best :)
Tried to explain it as easy as I could in the morning without giving you the direct solution ...

That are at least the basics. The rest with the unique part is up to you :)
Shouldnt be that hard.