从Python中的json治具中获取项

Question

我有过这样的经历：

[
  {
    fields: {
      username: "andriy",
      first_name: "",
      last_name: "",
      is_active: true,
      is_superuser: true,
      is_staff: true,
      last_login: "2015-03-26T13:20:01.902Z",
      groups: [ ],
      user_permissions: [ ],
      password: "pbkdf2_sha256$12000$YluCbMyidWwL$yH",
      email: "",
      date_joined: "2015-03-26T13:19:23.269Z"
    },
    model: "auth.user",
    pk: 4
  },

并尝试获取项目“用户名”的值：

import json
from collections import OrderedDict
from django.http import HttpResponse

path = 'management/test.json'
def load_fixture(name):
    r = json.load(open(path,'r+'), object_pairs_hook=OrderedDict)
    dic =  json.dumps(r, indent=2)
    name = dic['fields'][0]['username'] 
    return HttpResponse(name)

或以这种方式：

....
    def load_fixture(name):
    with open(path,'r+') as json_file:
        json_data = json_file.read()
        dic = json.loads(json_data)
        name = dic['fields'][0]['username']

        return HttpResponse(name)

并且总是得到错误：“字符串索引必须是整数，而不是str”或“列表索引必须是整数，而不是str”(在第二个代码中)。但是为什么呢？它确实是切碎的，而不是绳子。我到处都读过很多类似的话题，似乎也是人们的建议。我的密码怎么了？！

Answer 1

dic['fields'][0]['username']应该改为dic[0]['fields']['username']。因此，第二个源代码应该是：

def load_fixture(name):
with open(path,'r+') as json_file:
    json_data = json_file.read()
    dic = json.loads(json_data)
    name = dic[0]['fields']['username']

    return HttpResponse(name)