What is the best way to retrieve and manipulate JSON data using Python?

Hey there, I'm fairly new to coding and I've been working on a Python program that reads data from a JSON file and saves only specific information to another file. While researching how to parse the data, I came across something that's confusing me.

Here is a snippet of the JSON file:

`

{
 "profileRevision": 548789,
 "profileId": "campaign",
 "profileChangesBaseRevision": 548789,
 ...

`

I am able to access the 'profileChanges' data. To extract just this part into a new JSON file, I wrote the following code:

`

myjsonfile= open("file.json",'r') 
        jsondata=myjsonfile.read() 
        obj=json.loads(jsondata)  
        ciso=obj['profileChanges']
        for i in ciso:
            print(i)
        with open("file2", "w") as outfile:
            json.dump( ciso, outfile, indent=1)

The problem I face now is accessing the 'profile' information within 'profileChanges' in the same manner when parsing the new file. I'm stuck and unsure of how to proceed with it.

Answer №1

When working with JSON or dictionary elements, access is achieved through list indexes. Take a look at the example below:

a = [
  {
    "friends": [
      {
        "id": 0,
        "name": "Reba May"
      }
    ],
    "greeting": "Hello, Doris Gallagher! You have 2 unread messages.",
    "favoriteFruit": "strawberry"
  },
]

b = a['friends']['id] # b = 0

Answer №2

For your code snippet to be valid JSON, I made the necessary updates by adding closing braces:

s = '''{
 "profileRevision": 548789,
 "profileId": "campaign",
 "profileChangesBaseRevision": 548789,
 "profileChanges": [
  {
   "changeType": "fullProfileUpdate",
   "profile": {
    "_id": "2da4f079f8984cc48e84fc99dace495d",
    "created": "2018-03-29T11:02:15.190Z",
    "updated": "2022-10-31T17:34:43.284Z",
    "rvn": 548789,
    "wipeNumber": 9,
    "accountId": "63881e614ef543b2932c70fed1196f34",
    "profileId": "campaign",
    "version": "refund_teddy_perks_september_2022",
    "items": {
     "8ec8f13f-6bf6-4933-a7db-43767a055e66": {
      "templateId": "Quest:heroquest_loadout_constructor_2",
      "attributes": {
       "quest_state": "Claimed",
       "creation_time": "min",
       "last_state_change_time": "2019-05-18T16:09:12.750Z",
       "completion_complete_pve03_diff26_loadout_constructor": 300,
       "level": -1,
       "item_seen": true,
       "sent_new_notification": true,
       "quest_rarity": "uncommon",
       "xp_reward_scalar": 1
      },
      "quantity": 1
     },
     "6940c71b-c74b-4581-9f1e-c0a87e246884": {
      "templateId": "Worker:workerbasic_sr_t01",
      "attributes": {
       "gender": "2",
       "personality": "Homebase.Worker.Personality.IsDreamer",
       "level": 1,
       "item_seen": true,
       "squad_slot_idx": -1,
       "portrait": "WorkerPortrait:IconDef-WorkerPortrait-Dreamer-F02",
       "building_slot_used": -1,
       "set_bonus": "Homebase.Worker.SetBonus.IsMeleeDamageLow"
     }
    }
   }
   }
   }
  ]
 }
'''
d = json.loads(s)
print(d['profileChanges'][0]['profile']['version'])

The result will display

refund_teddy_perks_september_2022

To break it down:

  • d represents a dict
  • d['profileChanges'] is a list containing dictionaries
  • d['profileChanges'][0] corresponds to the initial dictionary in the list
  • d['profileChanges'][0]['profile']
    signifies another dict
  • d['profileChanges'][0]['profile']['version']
    indicates the value associated with the key version within the profile dict in the first element of the profileChanges array.

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