如何修复 Python 中嵌套字典中的“TypeError：元组索引必须是整数或切片，而不是 str”错误？

Question

I am having a TypeError "Exception has occurred: TypeError tuple indices must be integers or slices, not str". I am using python 3. Here is my code below:

    with open('item_info.json') as item_info:
        item_data = json.load(item_info)
    
    for collection in item_data:
        print(f'\n {collection}')
        for skin in item_data[collection].items():
            if skin['rarity'] == 'Consumer Grade':
                print(skin)

I have a large JSON file that I have imported using the JSON library in the variable item_data , collection is a dictionary containing nested dictionaries once loaded by the JSON library and skin is every individual dictionary within the collection , holding a key named 'rarity' . I would like to print every skin that has a value of 'rarity' equal to 'Consumer Grade' . I am trying to do this by nested for loops, as there are multiple collections and I'd like to loop through every skin in every collection as a check.

Here is a sample of the imported JSON held in item_data :

{
    "2018_inferno": {
        "MP5-SD | Dirt Drop (Factory New)": {
            "rarity": "Consumer Grade"
        },
        "MAC-10 | Calf Skin (Factory New)": {
            "rarity": "Industrial Grade"
        }
    },
    "2018_nuke": {
        "Five-SeveN | Coolant (Factory New)": {
            "rarity": "Consumer Grade"
        },
        "Negev | Bulkhead (Factory New)": {
            "rarity": "Industrial Grade"
        }
    },
    "alpha": {
        "Five-SeveN | Anodized Gunmetal (Factory New)": {
            "rarity": "Consumer Grade"
        },
        "P250 | Facets (Field-Tested)": {
            "rarity": "Industrial Grade"
        }
    }
}

The output should look something like this:

2018_inferno
{"MP5-SD | Dirt Drop (Factory New)": {"rarity": "Consumer Grade"}}

2018_nuke
{"Five-SeveN | Coolant (Factory New)": {"rarity": "Consumer Grade"}}

alpha
{"Five-SeveN | Anodized Gunmetal (Factory New)": {"rarity": "Consumer Grade"}}

or (more desirable)

2018_inferno
"MP5-SD | Dirt Drop (Factory New)"

2018_nuke
"Five-SeveN | Coolant (Factory New)"

alpha
"Five-SeveN | Anodized Gunmetal (Factory New)"

Answer 1

skin is a tuple of the the key-value pairs from item_data[collection].items() . Tuples cannot be accessed using string indicies ( skin['rarity'] )

You can iterate both keys and values at the same time, to make it easier to iterate, for example

for collection, item in item_data.items():
    print(f'\n{collection}')
    for k, v in item.items():
        if v.get('rarity') == 'Consumer Grade':
            print(k)