如何修复来自Python嵌套字典的"TypeError:元组索引必须是整数或切片，不是字符串“错误？

Question

我遇到了一个TypeError“发生异常: TypeError元组索引必须是整数或切片，而不是字符串”。我使用的是python 3，下面是我的代码：

    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)

我有一个使用JSON库在变量item_data中导入的大型JSON文件，collection是一个包含JSON库加载后嵌套字典的字典，skin是collection中的每个单独字典，其中包含一个名为'rarity'的键。我想打印每个值为'rarity'等于'Consumer Grade'的skin。我试图通过嵌套的for循环来做到这一点，因为有多个集合，我想循环遍历每个集合中的每个皮肤作为检查。

下面是保存在item_data中的导入JSON的示例

{
    "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"
        }
    }
}

输出应如下所示：

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"}}

或者(更理想)

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是来自item_data[collection].items()的键值对的元组。不能使用字符串索引(skin['rarity'])访问元组

您可以同时迭代键和值，以使其更易于迭代，例如

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)