return json 文件中的值 python 中的 5 层深度使用简单json

Question

正在尝试从 JSON 文件中获取值，在 python 中最多 5 层。当前出现此错误；

Traceback (most recent call last):
File "traffic.py", line 9, in <module>
print data['features'][0]['properties']['location']['road']
KeyError: 'location'

到目前为止，这是我的代码；

import urllib, simplejson
url = "http://131940.qld.gov.au/api/json/v1/events/?state=qld"
response = urllib.urlopen(url);
data = simplejson.loads(response.read())

for data['features'][0]['properties'] in data['features']:
    print data['features'][0]['properties']['location']['road']

JSON 文件的片段；

{
  "type": "FeatureCollection",
  "published": "27/06/2015 19:15",
  "rights": {
    "owner": "Department of Transport and Main Roads",
    "disclaimer": "The State of Queensland makes no statements, representations or warranties about the accuracy, currency, reliability or completeness of the information contained in this feed.",
    "copyright": "Copyright in material within this feed is owned by the State of Queensland or other entities which provide material for the website by arrangement. Please consult the 131940 website for further information."
  },
  "features": [
    {
      "type": "Feature",
      "id": 55141891,
      "source": {
        "externalid": null,
        "id": 2,
        "name": "Department of Transport and Main Roads"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          152.356430053711,
          -27.5912036895752
        ],
        "classifier": null
      },
      "properties": {
        "location": {
          "road": "VICTORIA STREET",
          "suburb": "FOREST HILL",
          "localGovernment": null,
          "postcode": "4342",
          "region": {
            "id": 104,
            "name": "Darling Downs"
          },
          "state": "QLD",
          "direction": "Both Directions",
          "additional": "Gallipoli Rememberence March.\r\nVictoria Street Forest Hill, between Church Street and William Steet"
        },
        "event": {
          "isHighImpact": false,
          "description": "Special Event Both Directions\r\nGallipoli Rememberence March.\r\nVictoria Street Forest Hill, between Church Street and William Steet.\r\nCommencing: 22 August 2015, between the hours of 10:30am and 11:15am\r\nConcluding: 22 August 2015.\r\nRoad closed both directions\r\nNo delays expected. Use alternative route. \r\n\r\n\r\nLast edited: 08 May 2015 09:35",
          "type": "Planned",
          "cause": "Special Event",
          "incidentType": "",
          "incidentDetails": "N/A",
          "delay": "No delays expected",
          "advice": "Use alternative route",
          "limit": null,
          "extraDetails": "\r\n",
          "impact": null
        },
        "temporal": {
          "start": "22/08/2015T10:30:00",
          "modified": "08/05/2015T09:35:14",
          "end": null,
          "review": null,
          "lastReviewed": null,
          "nextUpdate": null
        },
        "metadata": {
          "status": null,
          "owner": null,
          "modifiedBy": null,
          "url": "http://131940.qld.gov.au/road-conditions.aspx?id=55141891",
          "contactEmail": null
        }
      }
    },

我尝试了 print data['features'][0]['properties']['location']['road'] 的多种组合，例如。在 ['properties'] 之后尝试不同的索引或标签名称变体但没有成功。

任何关于如何读入 JSON 文件的 advice/code 示例，以及对 dictionary/list 结构的解释将不胜感激。

Answer 1

您应该将 for 循环更改为：

for info in data['features']:
    print info['properties']['location']['road']

说明： data['features'] returns 字典列表，其中每个字典如下：

{u'geometry': {u'type': u'Point', u'classifier': None, u'coordinates': [152.356430053711, -27.5912036895752]}, u'source': {u'externalid': None, u'id': 2, u'name': u'Department of Transport and Main Roads'}, u'type': u'Feature', u'id': 55141891, u'properties': {u'temporal': {u'end': None, u'nextUpdate': None, u'lastReviewed': None, u'modified': u'08/05/2015T09:35:14', u'start': u'22/08/2015T10:30:00', u'review': None}, u'metadata': {u'status': None, u'owner': None, u'contactEmail': None, u'modifiedBy': None, u'url': u'http://131940.qld.gov.au/road-conditions.aspx?id=55141891'}, u'location': {u'direction': u'Both Directions', u'additional': u'Gallipoli Rememberence March.\r\nVictoria Street Forest Hill, between Church Street and William Steet', u'region': {u'id': 104, u'name': u'Darling Downs'}, u'localGovernment': None, u'suburb': u'FOREST HILL', u'state': u'QLD', u'postcode': u'4342', u'road': u'VICTORIA STREET'}, u'event': {u'impact': None, u'description': u'Special Event Both Directions\r\nGallipoli Rememberence March.\r\nVictoria Street Forest Hill, between Church Street and William Steet.\r\nCommencing: 22 August 2015, between the hours of 10:30am and 11:15am\r\nConcluding: 22 August 2015.\r\nRoad closed both directions\r\nNo delays expected. Use alternative route. \r\n\r\n\r\nLast edited: 08 May 2015 09:35', u'type': u'Planned', u'advice': u'Use alternative route', u'delay': u'No delays expected', u'incidentDetails': u'N/A', u'limit': None, u'incidentType': u'', u'extraDetails': u'\r\n', u'cause': u'Special Event', u'isHighImpact': False}}}

所以我们现在需要做的就是到达 ['properties']['location']['road']。

return json 文件中的值 python 中的 5 层深度使用简单json

return value in json file 5 levels deep in python using simplejson

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