How would I be able to get a value from JSON?

Question

I am trying to retrieve a value of a JSON file, but I keep getting the error

/home/pi/Desktop/asd.py:5: SyntaxWarning: list indices must be integers or slices, not str; perhaps you missed a comma?
  print(str(y[['tunnels']['public_url']]))
Traceback (most recent call last):
  File "/home/pi/Desktop/asd.py", line 5, in <module>
    print(str(y[['tunnels']['public_url']]))
TypeError: list indices must be integers or slices, not str

Here is my code:

import json
import requests
y = requests.get('http://localhost:4040/api/tunnels').content
x = json.loads(y)
print(str(y[['tunnels']['public_url']]))

And here is the JSON file from http://localhost:4040/api/tunnels:

{
  "tunnels": [
    {
      "name": "command_line",
      "uri": "/api/tunnels/command_line",
      "public_url": "tcp://6.tcp.ngrok.io:18592",
      "proto": "tcp",
      "config": {
        "addr": "localhost:25565",
        "inspect": false
      },
      "metrics": {
        "conns": {
          "count": 166,
          "gauge": 0,
          "rate1": 0.017125393007699625,
          "rate5": 0.027720847107677204,
          "rate15": 0.02187693220653439,
          "p50": 1971501053.5,
          "p90": 11939627275.9,
          "p95": 11991631962.25,
          "p99": 19816396509.55
        },
        "http": {
          "count": 0,
          "rate1": 0,
          "rate5": 0,
          "rate15": 0,
          "p50": 0,
          "p90": 0,
          "p95": 0,
          "p99": 0
        }
      }
    }
  ],
  "uri": "/api/tunnels"
}

No matter how hard I try, I just can't seem to find a way to make this code work...

Answer 1

The requests Python module takes care of both retrieving JSON data and decoding it.

import requests
r = requests.get('http://localhost:4040/api/tunnels')
r.json()