如何在python中获取特定于JSON的字段值? [英] How to get a fields particular value of JSON in python?

问题描述

我目前正在从json提取字段，然后加以利用.因此，我有面部参数，并且我想存储每个字段的值.我正在尝试从face的JSON获取Gender值: JSON如下:

I am currently working on extracting fields from json and then make some use of that. Hence I have face parameters, and I want to store each field's value. I am trying to fetch the Gender value from a JSON of face : The JSON is as follows:

{
  "face": [
    {
      "attribute": {
        "age": {
          "range": 5,
          "value": 24
        },
        "gender": {
          "confidence": 99.9999,
          "value": "Female"
        },
        "glass": {
          "confidence": 99.4157,
          "value": "None"
        },
        "pose": {
          "pitch_angle": {
            "value": 0.000001
          },
          "roll_angle": {
            "value": 0.650337
          },
          "yaw_angle": {
            "value": -0.42409
          }
        },
        "race": {
          "confidence": 98.058,
          "value": "Asian"
        },
        "smiling": {
          "value": 3.78394
        }
      },
      "face_id": "42245f24335ad21ea7c54f2db96a09b3",
      "position": {
        "center": {
          "x": 50.121951,
          "y": 35.97561
        },
        "eye_left": {
          "x": 43.465122,
          "y": 30.670488
        },
        "eye_right": {
          "x": 56.80878,
          "y": 30.821951
        },
        "height": 27.560976,
        "mouth_left": {
          "x": 45.649512,
          "y": 45.041707
        },
        "mouth_right": {
          "x": 55.134878,
          "y": 44.858049
        },
        "nose": {
          "x": 50.183415,
          "y": 38.410732
        },
        "width": 27.560976
      },
      "tag": ""
    }
  ],
  "img_height": 410,
  "img_id": "1e3007cb3d6cfbaed3a1b4135524ed25",
  "img_width": 410,
  "session_id": "76ec7f99a471418fa8862a2138cc589d",
  "url": "http://www.faceplusplus.com/wp-content/themes/faceplusplus/assets/img/demo/1.jpg?v=2"
}

我想从上面的json中提取女性". 为此，我使用了这个:

I want to extract 'Female' from the above json. And for that, I used this :

 import urllib2
 import io, json
 from bs4 import BeautifulSoup
 data = soup #soup has all the data json
 with open('data.json', 'w') as outfile:
     json.dump(data, outfile, sort_keys = True, indent = 4, ensure_ascii=False)
 #content = json.loads(soup)
 jsonFile = open('data.json', 'r')
 values = json.load(jsonFile)
 jsonFile.close()
 gender = soup['face'][0]['gender']['value']
 print gender

我的代码在哪里不正确?

Where is my code incorrect?

推荐答案

根据您的json示例，gender在attribute内部，因此您需要以-

According to your json example , gender is inside attribute , so you need to access it as -

gender = soup['face'][0]['attribute']['gender']['value']

另外，似乎values是回读的(字典)json，所以您可能想使用values访问它，尽管我不确定您要实现的目标，所以我不能肯定地说

Also, seems like values is the json that is read back (dictionary), so you may want to access it using values , though I am not sure what you are trying to achieve so I cannot say for sure.

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