在 Python 中读取 JSON 对象时遇到问题答案

【问题标题】：Trouble reading JSON object in Python在 Python 中读取 JSON 对象时遇到问题
【发布时间】：2011-02-03 08:16:09
【问题描述】：

我有一个 JSON 对象，我正在尝试使用 Python 读取它，但我遇到了一些问题。我有一个名为“test.txt”的文件，其中包含接收到的 JSON 对象。 “test.txt”的内容如下：

{ "Sections": {"Now": "Thursday 3 February 2011 08:31",  "Section": [ { "Article": [ {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "Category 5 cyclone slams into flood-hit Queensland", "hasMore": "true", "ID": 44871, "important": "False", "likesCounter": 0, "photoCounter": 0, "time": "20:58", "timeStamp": "2\/2\/2011 8:59:37 PM", "timeStatus": "True", "Title": "Category 5 cyclone slams into flood-hit Queensland", "Type": "Politics", "videoCounter": 0, "viewsCounter": 2 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "The White House: Egypt must begin a peaceful and orderly transition of power immediately", "hasMore": "false", "ID": 44868, "important": "True", "likesCounter": 0, "photoCounter": 0, "time": "20:51", "timeStamp": "2\/2\/2011 8:52:28 PM", "timeStatus": "True", "Title": "The White House: Egypt must begin a peaceful and orderly transition of power immediately", "Type": "Politics", "videoCounter": 0, "viewsCounter": 0 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "Bazzi: Berri endeavors to facilitate cabinet formation", "hasMore": "true", "ID": 44866, "important": "False", "likesCounter": 0, "photoCounter": 0, "time": "20:47", "timeStamp": "2\/2\/2011 8:48:18 PM", "timeStatus": "True", "Title": "Bazzi: Berri endeavors to facilitate cabinet formation", "Type": "Politics", "videoCounter": 0, "viewsCounter": 0 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "Saker via Future News: Opening files era has ended, Gen. Aoun can\u0027t open any corruption files since his allies were the pioneers of corruption", "hasMore": "false", "ID": 44865, "important": "False", "likesCounter": 0, "photoCounter": 0, "time": "20:41", "timeStamp": "2\/2\/2011 8:45:36 PM", "timeStatus": "True", "Title": "Saker via Future News: Opening files era has ended, Gen. Aoun can\u0027t open any corruption files since his allies were the pioneers of corruption", "Type": "Politics", "videoCounter": 0, "viewsCounter": 0 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "White House deplores violence in Egypt", "hasMore": "true", "ID": 44857, "important": "False", "likesCounter": 0, "photoCounter": 0, "time": "20:28", "timeStamp": "2\/2\/2011 8:29:26 PM", "timeStatus": "True", "Title": "White House deplores violence in Egypt", "Type": "Politics", "videoCounter": 0, "viewsCounter": 1 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "Baabda sources via MTV: President Suleiman works on a consensus curriculum hoping for the formation of a national unity cabinet, if this does not happen, the cabinet will be political inlaid with technocrats", "hasMore": "false", "ID": 44855, "important": "False", "likesCounter": 0, "photoCounter": 0, "time": "20:20", "timeStamp": "2\/2\/2011 8:23:14 PM", "timeStatus": "True", "Title": "Baabda sources via MTV: President Suleiman works on a consensus curriculum hoping for the formation of a national unity cabinet, if this does not happen, the cabinet will be political inlaid with technocrats", "Type": "Politics", "videoCounter": 0, "viewsCounter": 0 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "An American senior official to Reuters: expects pressure on Mubarak by the army after street violence", "hasMore": "false", "ID": 44853, "important": "True", "likesCounter": 0, "photoCounter": 0, "time": "20:18", "timeStamp": "2\/2\/2011 8:20:14 PM", "timeStatus": "True", "Title": "An American senior official to Reuters: expects pressure on Mubarak by the army after street violence", "Type": "Politics", "videoCounter": 0, "viewsCounter": 0 }, {"audioCounter": 0, "commentsCounter": 0, "Exceprt": "The disappearance of the Al-Arabia correspondence Ahmed Abdullah in Egypt after clashing with Mubarak supporters", "hasMore": "false", "ID": 44851, "important": "True", "likesCounter": 0, "photoCounter": 0, "time": "20:17", "timeStamp": "2\/2\/2011 8:18:28 PM", "timeStatus": "True", "Title": "The disappearance of the Al-Arabia correspondence Ahmed Abdullah in Egypt after clashing with Mubarak supporters", "Type": "Politics", "videoCounter": 0, "viewsCounter": 0 } ], "ID": 22, "Name": "EN Live", "totalNews": 2997 } ] }}

我的python脚本：

import json;
f = open("test.txt");
d = json.load(f);
for i in d:
    print(i);

我的输出：

Sections

这就是我所得到的。我想最终列出“文章”及其属性。我尝试查看官方 Python 文档，但发现它有点模糊。

谢谢

【问题讨论】：

标签： python json

【解决方案1】：

在您的for i in d 循环中，您正在遍历字典的键。该字典仅包含一个顶级键，即“Sections”，这就是为什么您只能看到该输出。

我不完全理解您的 JSON 的结构，但您似乎想要这样的东西：

for aritcle in d['Sections']['Section'][0]['Article']:
      print article

这会将所有文章打印出来。

【讨论】：

哇！感谢您的及时答复！这解决了我的问题！我仍然从 Python 开始，我还没有完全理解 dict 结构。再次感谢！
没问题 - 另一个巧妙的技巧是大多数（全部？）JSON 也是有效的 Python 代码。您可以直接将 JSON 复制并粘贴到 Python 解释器中。这对实验很好。但是，当涉及到应用程序时，最好坚持使用 json 模块。
并非所有 JSON 代码都是有效的 Python，但大部分都是有效的。例如，JSON 将布尔值 True/False 映射为 true/false，将 Python 的 None 映射为 null。毕竟，它是“Javascript 对象表示法”。 :)
@jellybean，啊，好点子，我知道我会忘记这样的事情:)

【解决方案2】：

在您的 JSON 数据中，Sections 是最外层的数据，并且只出现一次。因此输出也是预期的输出，json.load 会将列表解析为 python 对象。

您可以通过对 Sections 执行 for 循环来访问 section 成员，然后为每个 section 执行另一个 for 循环来获取每篇文章。

【讨论】：

【解决方案3】：

应该是：

for i in d.items():
    print(i);

或者是：

for k,v in d.items():
    print k, v

您将键和值放入单独的变量中。

d 是一个 python 字典，你必须遍历它的键和值。

【讨论】：