在Python中访问嵌套的JSON数据

Question

给我的程序一个JSON类，我需要访问其中的某些项。

我不完全了解数据结构的类型，这可能是我的问题的一部分。

我尝试了json.dumps()和json.load() ，这两个方法都会返回错误。 我什至尝试过._dict_ 。

我收到以下错误：
"the JSON object must be str, bytes or bytearray, not 'LambdaContext'," "'LambdaContext' object has no attribute '_dict_'," and "Object of type 'LambdaContext' is not JSON serializable." I don't know what else to do with this JSON data.

我需要访问“ apiAccessToken”。

JSON数据：

{
  "context": {
    "System": {
      "apiAccessToken": "AxThk...",
      "apiEndpoint": "https://api.amazonalexa.com",
      "device": {
        "deviceId": "string-identifying-the-device",
        "supportedInterfaces": {}
      },
      "application": {
        "applicationId": "string"
      },
      "user": {}
    }
  }
}

我的代码：

def postalCodeRetriever(intent, session, context):
    deviceId = session['user']['userId']
    jsoninfo = json.dumps(context)
    json_dict = json.loads(jsoninfo)
    print(str(json_dict))
    TOKEN = context["System"]
    print(TOKEN)
    URL = "https://api.amazonalexa.com/v1/devices/" + deviceId + "/settings/address/countryAndPostalCode"
    HEADER = {'Accept': 'application/json', 'Authorization': 'Bearer ' + TOKEN}
    response = urllib2.urlopen(URL, headers=HEADER)
    data = json.load(response)
    postalCode = data['postalCode']
    return build_response({}, build_speechlet_response(
                "hello", postalCode, None, True))

Answer 1

下面的代码应该做到这一点：

import json
data = json.dumps({
  "context": {
    "System": {
      "apiAccessToken": "AxThk...",
      "apiEndpoint": "https://api.amazonalexa.com",
      "device": {
        "deviceId": "string-identifying-the-device",
        "supportedInterfaces": {}
      },
      "application": {
        "applicationId": "string"
      },
      "user": {}
    }
  }
})
data_dict = json.loads(data)
print(data_dict['context']['System']['apiAccessToken'])

输出：

AxThk...