如何从Python中解析的JSON中的key:value对中获取值

我试图从JSON文件中提取数据。这是我的密码

import json
json_file = open('test.json')                                                                                                                          
data = json.load(json_file)
json_file.close()

此时，我可以使用打印数据打印该文件，并且该文件似乎已正确读入

现在，我想从嵌套在字典中的列表中的字典中的key:value对中获取一个值（Phew！）。我最初的策略是创建一个字典，将嵌套在其中列表中的字典扑通一声，然后提取我需要的键：值对

dict = {}
dict = json_file.get('dataObjects', None)
dict[0]

当我试图查看dict的内容时，我发现只有一个元素。整本词典似乎都是以列表的形式阅读的。我尝试了几种不同的方法，但最终还是得到了一本字典作为列表阅读。我想获取嵌套字典并使用另一个。获取我需要的值。下面是我正在使用的JSON示例。具体地说，我试图从dataObjects部分提取标识符和描述值

{
  "identifier": 213726,
  "scientificName": "Carcharodon carcharias (Linnaeus, 1758)",
  "richness_score": 89.6095,
  "synonyms": [

  ],

  "taxonConcepts": [
    {
      "identifier": 20728481,
      "scientificName": "Carcharodon carcharias (Linnaeus, 1758)",
      "nameAccordingTo": "WORMS Species Information (Marine Species)",
      "canonicalForm": "Carcharodon carcharias",
      "sourceIdentfier": "105838"
    },
    {
      "identifier": 24922984,
      "scientificName": "Carcharodon carcharias",
      "nameAccordingTo": "IUCN Red List (Species Assessed for Global Conservation)",
      "canonicalForm": "Carcharodon carcharias",
      "sourceIdentfier": "IUCN-3855"
    },
  ],
  "dataObjects": [
    {
      "identifier": "5e1882d822ec530069d6d29e28944369",
      "dataObjectVersionID": 5671572,
      "dataType": "http://purl.org/dc/dcmitype/Text",
      "dataSubtype": "",
      "vettedStatus": "Trusted",
      "dataRating": 3.0,
      "subject": "http://rs.tdwg.org/ontology/voc/SPMInfoItems#TaxonBiology",
      "mimeType": "text/html",
      "title": "Biology",
      "language": "en",
      "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
      "rights": "Copyright Wildscreen 2003-2008",
      "rightsHolder": "Wildscreen",
      "audience": [
        "General public"
      ],
      "source": "http://www.arkive.org/great-white-shark/carcharodon-carcharias/",
      "description": "Despite its worldwide notoriety, very little is known about the natural ecology and behaviour of this predator. These sharks are usually solitary or occur in pairs, although it is apparently a social animal that can also be found in small aggregations of 10 or more, particularly around a carcass (3) (6). Females are ovoviviparous; the pups hatch from eggs retained within their mother's body, and she then gives birth to live young (10). Great white sharks are particularly slow-growing, late maturing and long-lived, with a small litter size and low reproductive capacity (8). Females do not reproduce until they reach about 4.5 to 5 metres in length, and litter sizes range from two to ten pups (8). The length of gestation is not known but estimated at between 12 and 18 months, and it is likely that these sharks only reproduce every two or three years (8) (11). After birth, there is no maternal care, and despite their large size, survival of young is thought to be low (8). Great whites are at the top of the marine food chain, and these sharks are skilled predators. They feed predominately on fish but will also consume turtles, molluscs, and crustaceans, and are active hunters of small cetaceans such as dolphins and porpoises, and of other marine mammals such as seals and sea lions (12). Using their acute senses of smell, sound location and electroreception, weak and injured prey can be detected from a great distance (7). Efficient swimmers, sharks have a quick turn of speed and will attack rapidly before backing off whilst the prey becomes weakened; they are sometimes seen leaping clear of the water (6). Great whites, unlike most other fish, are able to maintain their body temperature higher than that of the surrounding water using a heat exchange system in their blood vessels (11).",
      "agents": [
        {
          "full_name": "ARKive",
          "homepage": "http://www.arkive.org/",
          "role": "provider"
        }
      ],
    }
  ]
}

---

json无法读取您提供的源代码，其中有两个逗号必须删除（底部第四行的一个逗号，以及

dataObjects

上方的两行逗号）。 只有在这之后，

json

模块才能正确解析：

import json

json_file = open('test.json')
data = json.load(json_file)
do = data['dataObjects'][0]
print do['identifier']
print do['description']
json_file.close()