Extract single value from JSON data using key

Question

I have the following JSON data:

{
  "status": {
    "status_code": 0,
    "status_message": "SUCCESS"
  },
  "device_id": 89911454,
  "type": "obs_st",
  "source": "cache",
  "summary": {
    "pressure_trend": "falling",
    "strike_count_1h": 0,
    "strike_count_3h": 0,
    "precip_total_1h": 0.0,
    "precip_accum_local_yesterday": 0.0,
    "precip_accum_local_yesterday_final": 0.0,
    "precip_analysis_type_yesterday": 1,
    "feels_like": 33.3,
    "heat_index": 33.3,
    "wind_chill": 33.3
  },
  "obs": [
    [1600214324, 0, 0, 0, 0, 3, 1012.8, 33.3, 35, 27898, 1.94, 232, 0, 0, 0, 0, 2.56, 1, 0, null, null, 0]
  ]
}

I only want the value for "heat_index". In this case that "heat_index" = 33.3. I've not been able to figure out how. Can anyone give me a hand with this? Thanks for any help provided!

Thanks for the tip, but whenever I do something like that I get this error message: TypeError: string indices must be integers — dwburger
– dwburger, Commented Sep 16, 2020 at 0:59
Yes, it does work if I do this first: json_data = json.loads(result) Thanks! — dwburger
– dwburger, Commented Sep 16, 2020 at 1:01

Omar6575 · Accepted Answer · 2024-05-14 22:24:07Z

1

If you have a json object stored in string format you need to decode it before you can access it using the "[ ]" operators. Luckily Python as usual already has a library for this. The json library has the ability to encode, decode and pretty print json data.

import json

file = open("your-json-file-here.json")
jsonString = file.read()
file.close()

jsonObject = json.loads(jsonString)
print(jsonObject["summary"]["heat_index"])

It doesn't matter too much how you get the json string as long as you call the loads function on it.

edited May 14, 2024 at 22:24

answered Sep 16, 2020 at 1:16

Omar6575

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