在 dictionaries/nested 词典列表 python 中搜索和过滤

Question

您好，我在过滤此词典列表时遇到问题。我试图到达的是 all_assets 列表中的 'attributes' 字典并按（例如）背景：星号的值对其进行过滤。我目前的尝试是使用 filter() 和 lambda 函数。

我目前的情况是这样的：

all_assets = [{'dateListed': 58391,
  'id': '118572',
  'metadata': {'files': [],
               'mediaType': 'image/png',
               'name': 'The three',
               'tags': [{'right': '101 Galaxy'},
                        {'attributes': {'Background': 'Mars',
                                        'Body': 'Rough',
                                        'Face': 'Dumb',
                                        'Headwear': 'Helmet'}}],
               'thumbnail': 'something'},
  'Session': None,
  'police': 'pewpew',
  'verified': {'project': 'Thes', 'verified': True}},
 {'dateListed': 430298239,
  'id': '1191281',
  'metadata': {'files': [],
               'mediaType': 'image/png',
               'name': 'TheOne',
               'tags': [{'right': '101 Galaxy'},
                        {'attributes': {'Background': 'Star',
                                        'Body': 'Smooth',
                                        'Face': 'Fresh',
                                        'Headwear': 'Cap'}}],
               'thumbnail': 'something'},
  'Session': None,
  'police': 'pewpew',
  'verified': {'project': 'Thes', 'verified': True}}]

search_attribute = 'Background'
search_attribute_value = 'Star'

filtered = filter(lambda i: any(d.get(search_attribute, 'xxx') == search_attribute_value for d in i['metadata']['tags']['attributes']), all_assets)
# print(list(filtered))

输出应该是因为搜索属性是星：

 {'dateListed': 430298239,
  'id': '1191281',
  'metadata': {'files': [],
               'mediaType': 'image/png',
               'name': 'TheOne',
               'tags': [{'right': '101 Galaxy'},
                        {'attributes': {'Background': 'Star',
                                        'Body': 'Smooth',
                                        'Face': 'Fresh',
                                        'Headwear': 'Cap'}}],
               'thumbnail': 'something'},
  'Session': None,
  'police': 'pewpew',
  'verified': {'project': 'Thes', 'verified': True}}]

然后我想对过滤后的列表做的是打印出一些值像 'id'、'name' 和 'headwear'.

    for x in filtered:
        id = (x.get('id'))
        name = (x.get('metadata')('name'))
        headwear = (x.get('metadata')('tags')('attributes')('Headwear'))
        print(f'ID: {id}')
        print(f'Name: {name}')
        print(f'Headwear: {headwear}')

我正在尝试获取以下输出：

ID: 1191281
Name: TheOne
Headwear: Cap

我对 python 这个领域有些陌生，因为我对 lambda 函数只知道一点。很抱歉，如果这是一个愚蠢的问题。

Answer 1

我编写了自定义过滤方法：

def customFilter(all_assets, search_attribute, search_attribute_value):
    res = []
    for asset in all_assets:
        if asset:
            attributes = asset["metadata"]["tags"][1]["attributes"]
            if attributes and search_attribute in attributes:
                if search_attribute_value == attributes[search_attribute]:
                    res.append(asset)
    return res

让我们测试一下：

all_assets = [
    {
        "dateListed": 58391,
        "id": "118572",
        "metadata": {
            "files": [],
            "mediaType": "image/png",
            "name": "The three",
            "tags": [
                {"right": "101 Galaxy"},
                {
                    "attributes": {
                        "Background": "Mars",
                        "Body": "Rough",
                        "Face": "Dumb",
                        "Headwear": "Helmet",
                    }
                },
            ],
            "thumbnail": "something",
        },
        "Session": None,
        "police": "pewpew",
        "verified": {"project": "Thes", "verified": True},
    },
    {
        "dateListed": 430298239,
        "id": "1191281",
        "metadata": {
            "files": [],
            "mediaType": "image/png",
            "name": "TheOne",
            "tags": [
                {"right": "101 Galaxy"},
                {
                    "attributes": {
                        "Background": "Star",
                        "Body": "Smooth",
                        "Face": "Fresh",
                        "Headwear": "Cap",
                    }
                },
            ],
            "thumbnail": "something",
        },
        "Session": None,
        "police": "pewpew",
        "verified": {"project": "Thes", "verified": True},
    },
]

search_attribute = "Background"
search_attribute_value = "Star"

print(customFilter(all_assets, search_attribute, search_attribute_value))

输出：

[{'dateListed': 430298239, 'id': '1191281', 'metadata': {'files': [], 'mediaType': 'image/png', 'name': 'TheOne', 'tags': [{'right': '101 Galaxy'}, {'attributes': {'Background': 'Star', 'Body': 'Smooth', 'Face': 'Fresh', 'Headwear': 'Cap'}}], 'thumbnail': 'something'}, 'Session': None, 'police': 'pewpew', 'verified': {'project': 'Thes', 'verified': True}}]

在 dictionaries/nested 词典列表 python 中搜索和过滤

Searching and Filtering in a list of dictionaries/nested dictionary python

python

lambda

dictionary

list

generator-expression