[python] How to count items in JSON data

How I can get the number of elements in node of JSON data?

JSON:

{
  "result":[
    {
      "run":[
        {
          "action":"stop"
        },
        {
          "action":"start"
        },
        {
          "action":"start"
        }
      ],
      "find":true
    }
  ]
}

I need to get the number of elements from node data['result'][0]['run']. It should be 3, but I can't find how to do it in Python.

You're close. A really simple solution is just to get the length from the 'run' objects returned. No need to bother with 'load' or 'loads':

len(data['result'][0]['run'])