Question

我正在尝试使用Python访问嵌套的JSON值。

这是我的JSON的摘录：

    {
  "data": [
    {
      "name": "page_video_views",
      "period": "day",
      "values": [
        {
          "value": 634,
          "end_time": "2018-11-23T08:00:00+0000"
        },
        {
          "value": 465,
          "end_time": "2018-11-24T08:00:00+0000"
        }
      ],
      "title": "Daily Total Video Views",
      "description": "Daily: Total number of times videos have been viewed for more than 3 seconds. (Total Count)",
      "id": "{page-id}/insights/page_video_views/day"
    },

这是我到目前为止编写的代码：

import json
import urllib.request

data = urllib.request.urlopen("https://graph.facebook.com/v3.1/{page-id}/insights?access_token={access-token}&pretty=0&metric=page_impressions%2cpage_engaged_users%2cpage_fans%2cpage_video_views%2cpage_posts_impressions").read()

output = json.loads(data)

print(json.dumps(output, indent=2))

for item in output['data']:
    name = item['name']
    period = item['period']
    value = item['data']['values']['value']

    print(name, period, value)

我面临的问题是，每当我运行代码来访问“名称”和“句号”时，它就可以很好地工作，但是我无法访问“值”中的“值”。我相信这是因为有两个“价值”结果，我想每次都拉第一个。

感谢您的帮助

Answer 1

library("qgraph") data("big5") big5_sub1 <- big5[1:249,1:10] big5_sub2 <- big5[249:500,1:10] cor1 <- cor(big5_sub1) cor2 <- cor(big5_sub2) cor.diff <- cor1-cor2 qgraph(cor.diff)是一个列表。您需要获取其第一个元素，然后才能访问其item['data']['values']字段。也就是说，对应的行应为：

'value'

使用Python访问嵌套的JSON值

1 个答案: