嵌套数据到列表

Question

f = open("sample_diction.json","r")
sample_photo_rep = json.loads(f.read())
print sample_photo_rep
f.close()

以上是我的代码正在打开文件 sample_diction.json 并将其内容作为 Python 对象加载到变量 sample_photo_rep 中。我尝试做的下一步是编写代码来访问 sample_flickr_obj 中的嵌套数据，以创建该照片的所有标签列表（“sample_diction.json”中的数据）。然后我想将标签列表保存在一个名为 sample_tags_list 的变量中。以下是 sample_diction.json 中包含的数据......我只是不确定从哪里开始。任何帮助，将不胜感激。

{
  "photo": {
    "people": {
      "haspeople": 0
    }, 
    "dateuploaded": "1467709435", 
    "owner": {
      "username": "Ansel Adams",
      "realname": "", 
      "nsid": "48093195@N03", 
      "iconserver": "7332", 
      "location": "", 
      "path_alias": null, 
      "iconfarm": 8
    }, 
    "publiceditability": {
      "canaddmeta": 1, 
      "cancomment": 1
    }, 
    "id": "27820301400", 
    "title": {
      "_content": "Photo1"
    }, 
    "media": "photo", 
    "tags": {
      "tag": [
        {
          "machine_tag": false, 
          "_content": "nature",
          "author": "48093195@N03", 
          "raw": "Nature",
          "authorname": "ac | photo albums", 
          "id": "48070141-27820301400-5470"
        }, 
        {
          "machine_tag": false, 
          "_content": "mist",
          "author": "48093195@N03", 
          "raw": "Mist",
          "authorname": "ac | photo albums", 
          "id": "48070141-27820301400-852"
        }, 
        {
          "machine_tag": false, 
          "_content": "mountain",
          "author": "48093195@N03", 
          "raw": "Mountain",
          "authorname": "ac | photo albums", 
          "id": "48070141-27820301400-1695"
        }
      ]
    }, 
    "comments": {
      "_content": "0"
    }, 
    "secret": "c86034becf", 
    "usage": {
      "canblog": 0, 
      "canshare": 1, 
      "candownload": 0, 
      "canprint": 0
    }, 
    "description": {
      "_content": ""
    }, 
    "isfavorite": 0, 
    "views": "4", 
    "farm": 8, 
    "visibility": {
      "isfriend": 0, 
      "isfamily": 0, 
      "ispublic": 1
    }, 
    "rotation": 0, 
    "dates": {
      "taken": "2016-07-05 11:03:52", 
      "takenunknown": "1", 
      "takengranularity": 0, 
      "lastupdate": "1467709679", 
      "posted": "1467709435"
    }, 
    "license": "0", 
    "notes": {
      "note": []
    }, 
    "server": "7499", 
    "safety_level": "0", 
    "urls": {
      "url": [
        {
          "type": "photopage", 
          "_content": "https://www.flickr.com/photos/48093195@N03/27820301400/"
        }
      ]
    }, 
    "editability": {
      "canaddmeta": 0, 
      "cancomment": 0
    }
  }, 
  "stat": "ok"
}

Answer 1

嵌套数据一开始可能会让人望而生畏，但如果你一步一步来，就会很容易。

您从 sample_photo_re 开始。是字典，只有一个键。

所以 :

sample_photo_rep["photo"]

这是另一个字典。有趣的信息似乎在 tags :

sample_photo_rep["photo"]["tags"]

又一个字典。所以：

sample_photo_rep["photo"]["tags"]["tag"]

这次是一个列表，所以你可以对其进行迭代:

for tag in sample_photo_rep["photo"]["tags"]["tag"]:
    print tag

它输出：

{'machine_tag': False, '_content': 'nature', 'author': '48093195@N03', 'raw': 'Nature', 'authorname': 'ac | photo albums', 'id': '48070141-27820301400-5470'}
{'machine_tag': False, '_content': 'mist', 'author': '48093195@N03', 'raw': 'Mist', 'authorname': 'ac | photo albums', 'id': '48070141-27820301400-852'}
{'machine_tag': False, '_content': 'mountain', 'author': '48093195@N03', 'raw': 'Mountain', 'authorname': 'ac | photo albums', 'id': '48070141-27820301400-1695'}

那些都是字典。您可能只对 raw 键感兴趣，所以：

for tag in sample_photo_rep["photo"]["tags"]["tag"]:
    print tag['raw']
# Nature
# Mist
# Mountain

完成！

如果您遇到错误（例如 KeyError: 'row'），请退一步查看数据，可能使用 type(object) 查看它是列表还是字典。

更新：要获得 [u'nature', u'mist', u'mountain'] :

[unicode(tag) for tag in sample_photo_rep["photo"]["tags"]["tag"]]

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