Question

我有一个包含data和meta data的python文件。我在该文件上使用以下程序。

import requests
from lxml import html
import json

with open("tmp.json") as json_file:
        json_data = json.load(json_file)
        print(json_data)

在输出中，我在JSON文件中同时获得data和metadata。我想只提取数据部分。我该怎么做？

我的JSON文件的示例结构如下。

 "data": [
        {
            "AvInterval": null,
            "DelInterval": null,
            "ntsGenerated": null,
            "ntsGenerated": null,
            "Metric": "Intervals",
            "Total": 23
        },
        {
            "AvInterval": null,
            "DelInterval": null,
            "ntsGenerated": null,
            "ntsGenerated": null,
            "Metric": "CPU",
            "Total": 47
        },
      ],
"metadata": {
       "columns": [
        {
            "Caption": "Metric",
            "Field": "Metric",
            "Type": "string",
            "Width": "*"
        },
        {
            "Caption": "Total",
            "Field": "Total",
            "Type": "long",
            "Width": "*"
        },
  ]

}

我想从上述文件中删除metadata并将data剪切成不同的部分，并将每个单独的部分写入文件。

Answer 1

如果您想将数据分成不同的部分并将每个部分写入自己的文件，您可以这样做：

with open("tmp.json") as json_file:
    json_data = json.load(json_file)
    for i, data_item in enumerate(json_data['data']):
        fname = 'data_%s' % i
        with open(fname, 'w') as outfile:
            json.dump(data_item, outfile)

Answer 2

使用data键

json_data['data']

Answer 3

假设下面是json，试试这个

import simplejson as json

with open("tmp.json", "r") as json_file:
    extracted_data = json.loads(json_file)

    for data in  extracted_data['data']:
        print data['AvInterval'], data['Metric'], data['DelInterval']

下面的json示例

{
    "data": [
            {
                "AvInterval": null,
                "DelInterval": null,
                "ntsGenerated": null,
                "ntsGenerated": null,
                "Metric": "Intervals",
                "Total": 23
            },
            {
                "AvInterval": null,
                "DelInterval": null,
                "ntsGenerated": null,
                "ntsGenerated": null,
                "Metric": "CPU",
                "Total": 47
            }
          ],
    "metadata": {
           "columns": [
            {
                "Caption": "Metric",
                "Field": "Metric",
                "Type": "string",
                "Width": "*"
            },
            {
                "Caption": "Total",
                "Field": "Total",
                "Type": "long",
                "Width": "*"
            }
      ]
    }
}

Python程序从JSON文件中提取数据

3 个答案: