如何从 python 字典中找到特定键，然后从 Python 中的该键获取值

Question

我有一个 python 字典，看起来像这样：

[
    {
        "timestamp": 1621559698154,
        "user": {
            "uri": "spotify:user:xxxxxxxxxxxxxxxxxxxx",
            "name": "Panda",
            "imageUrl": "https://i.scdn.co/image/ab67757000003b82b54c68ed19f1047912529ef4"
        },
        "track": {
            "uri": "spotify:track:6SJSOont5dooK2IXQoolNQ",
            "name": "Dirty",
            "imageUrl": "http://i.scdn.co/image/ab67616d0000b273a36e3d46e406deebdd5eafb0",
            "album": {
                "uri": "spotify:album:0NMpswZbEcswI3OIe6ml3Y",
                "name": "Dirty (Live)"
            },
            "artist": {
                "uri": "spotify:artist:4ZgQDCtRqZlhLswVS6MHN4",
                "name": "grandson"
            },
            "context": {
                "uri": "spotify:artist:4ZgQDCtRqZlhLswVS6MHN4",
                "name": "grandson",
                "index": 0
            }
        }
    },
   
    {
        "timestamp": 1621816159299,
        "user": {
            "uri": "spotify:user:xxxxxxxxxxxxxxxxxxxxxxxx",
            "name": "maja",
            "imageUrl": "https://i.scdn.co/image/ab67757000003b8286459151d5426f5a9e77cfee"
        },
        "track": {
            "uri": "spotify:track:172rW45GEnGoJUuWfm1drt",
            "name": "Your Best American Girl",
            "imageUrl": "http://i.scdn.co/image/ab67616d0000b27351630f0f26aff5bbf9e10835",
            "album": {
                "uri": "spotify:album:16i5KnBjWgUtwOO7sVMnJB",
                "name": "Puberty 2"
            },
            "artist": {
                "uri": "spotify:artist:2uYWxilOVlUdk4oV9DvwqK",
                "name": "Mitski"
            },
            "context": {
                "uri": "spotify:playlist:0tol7yRYYfiPJ17BuJQKu2",
                "name": "I Bet on Losing Dogs",
                "index": 0
            }
        }
    }
]

例如，如何获取 user.name“熊猫”的值组，然后获取特定的“曲目”列表？我无法按索引解析列表，因为列表顺序随机更改。

Answer 1

如果您只查找“Panda”，那么您可以直接遍历列表，检查名称是否为“Panda”，然后相应地检索曲目列表。

否则，如果您想为许多不同的用户执行此操作，效率会很低。我首先制作一个字典，将用户映射到列表中的索引，然后为每个用户使用它（我假设列表没有被修改而你执行代码，虽然它可以在执行之间修改。）

user_to_id = {data[i]['user']['name']: i for i in range(len(data))} # {'Panda': 0, 'maja': 1}

def get_track(user):
    return data[user_to_id[user]]['track']

print(get_track('maja'))
print(get_track('Panda'))

其中 data 是您提供的列表。

或者，也许直接制作曲目字典：

tracks = {item['user']['name']: item['track'] for item in data}

print(tracks['Panda'])

Answer 2

如果您想获取用户 Panda 的曲目列表：

tracks = [entry['track'] for entry in data if entry['user']['name'] == 'Panda']

如何从 python 字典中找到特定键，然后从 Python 中的该键获取值

How can I find a specific key from a python dict and then get a value from that key in Python

python

json

dictionary

list

spotify