Using data from JSON response in python [duplicate]

Question

I am currently working on a small face recognition project using Kairos, and I can't figure out how to use my response data. This is based on the data of the picture i'm sending:

request = Request(url, data=values, headers=headers)
response_body = urlopen(request).read()
print(response_body)

My response is something like this, where I want to use the "confidence" value:

{
"images": [
    {
      "transaction": {
        "status": "success",
        "width": 327,
        "topLeftX": 512,
        "topLeftY": 466,
        "gallery_name": "MyGallery",
        "subject_id": "XXX",
        "confidence": 0.70211,
        "quality": -0.06333,
        "eyeDistance": 145,
        "height": 328
      }
    }
  ],
  "uploaded_image_url": "https://XXX"
}

How do I extract the value "confidence" from this code?

There's a Python documentation page on json. Have you read it? — OneCricketeer
– OneCricketeer, Commented Nov 2, 2017 at 13:52
Where did the Request class come from? If the requests module, you can use the json method to decode the response automatically and get back a Python dict. — chepner
– chepner, Commented Nov 2, 2017 at 13:58

Axnyff · Accepted Answer · 2017-11-02 13:55:35Z

2

Your response is a string. What you want is a python data collection, dictionary/ list. To easily solve this problem, you can simply use the loads method from the json library.

import loads from json
data = loads(response_body)

Then to get the confidence value you can do

confidence = data.images[0].transaction.confidence

edited Nov 2, 2017 at 13:55

answered Nov 2, 2017 at 13:50

Axnyff

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3 Comments

Sam Over a year ago

what he said. JSON formatted data is more or less a fancy formatted dictionary. Make sure you are reading it as one.

OneCricketeer Over a year ago

The question asked how to get the confidence value

Axnyff Over a year ago

I edited my answer

Sokk · Accepted Answer · 2017-11-02 14:53:06Z

0

Thanks for the responses.

I got the correct value by using:

request = Request(url, data=values, headers=headers)
response_body = json.loads(urlopen(request).read())
confidence = response_body.get('images')[0].get('transaction').get('confidence')
print(confidence)

answered Nov 2, 2017 at 14:53

Sokk

1

Comments

Sandeep Lade · Accepted Answer · 2017-11-02 13:59:17Z

-1

You can get like this. Your response is a nexted dictionary

>>> resp
{'images': [{'transaction': {'status': 'success', 'width': 327, 'topLeftX': 512, 'topLeftY': 466, 'gallery_name': 'MyGallery', 'subject_id': 'XXX', 'height': 328, 'quality': -0.06333, 'confidence': 0.70211, 'eyeDistance': 145}}], 'uploaded_image_url': 'https://XXX'}

>>> resp.get('images')[0].get('transaction').get('confidence')
0.70211
>>>

edited Nov 2, 2017 at 13:59

answered Nov 2, 2017 at 13:57

Sandeep Lade

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3 Comments

chepner Over a year ago

The OP doesn't have a dict yet, just the byte string returned by read.

Sandeep Lade Over a year ago

As per OP desciption response is dictionary

chepner Over a year ago

No, the output of print(response_body) looks like a dictionary. Compare the output of print({'foo': 1}) with print("{'foo': 1}"). It's unlikely that a method named read is returning anything other than raw bytes.

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