How can I index search a JSON file with different elements in Python [closed]

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In this python script I am trying to randomly access one of the components in this JSON file, however I repeatedly receive a "Keyerror".

Here is the code:

import json

def genCard():
   with open("cards.json", "r") as file:
      cards = json.load(file)
      x = random.randint(0, len(cards["cards"]) - 1)
      card = cards["cards"][str(x)] ## Have also used ["cards"][x]
      print(card)
      return card

Here is a section of the JSON file.

{
    "cards": {
        "25": {
            "id": 25,  
            "name": "Aliks",
            "image": "Aliks.png",
            "group": "Summer",
            "atk": 6,
            "def": 4,
            "int": 8,
            "spd": 4,
            "agl": 7
        },
        "113": {
            "id": 113,
            "name": "Nichel",
            "image": "PlaceHolder.png",
            "group": "Summer",
            "atk": 7,
            "def": 5,
            "int": 7,
            "spd": 5,
            "agl": 6
        },
        "27": {
            "id": 27,
            "name": "Arian",
            "image": "PlaceHolder.png",
            "group": "Summer",
            "atk": 8,
            "def": 6,
            "int": 3,
            "spd": 6,
            "agl": 7
        }
    }
}

I simply want to pick a random card from this JSON list, any help?

Here is the error report, I am using a discord library to develop a discord application.

Traceback (most recent call last):
  File "c:\Users\Gamer\AppData\Local\Programs\Python\Python313\Lib\site-packages\discord\ext\commands\core.py", line 235, in wrapped
    ret = await coro(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Development\Stuff\Discord Bots\TestThingForNow\discordBot", line 109, in pull
    card = genCard()
  File "C:\Development\Stuff\Discord Bots\TestThingForNow\discordBot", line 43, in genCard
    card = cards["cards"][x] ## Have also used ["cards"][x]
           ~~~~~~~~~~~~~~^^^
KeyError: 1

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\Users\Gamer\AppData\Local\Programs\Python\Python313\Lib\site-packages\discord\ext\commands\bot.py", line 1366, in invoke
    await ctx.command.invoke(ctx)
  File "c:\Users\Gamer\AppData\Local\Programs\Python\Python313\Lib\site-packages\discord\ext\commands\core.py", line 1029, in invoke
    await injected(*ctx.args, **ctx.kwargs)  # type: ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\Gamer\AppData\Local\Programs\Python\Python313\Lib\site-packages\discord\ext\commands\core.py", line 244, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: KeyError: 1

Please edit your question to include the full error message, fix the indentation in the first code block, and include the necessary imports. — JRiggles
– JRiggles, Commented Aug 19 at 17:10
Work backwards. start by seeing what the value of the key is that your code is trying to access the json with — Thomas
– Thomas, Commented Aug 19 at 17:14
your error is KeyError: 'an int value' isn't it ? as said before this because the map doesn't have the random key — bruno
– bruno, Commented Aug 19 at 17:18
maybe you should get keys = cards["cards"].keys() and use x = random.choice(keys) — furas
– furas, Commented Aug 19 at 17:20

JRiggles · Accepted Answer · 2025-08-19 17:25:54Z

1

You're getting a KeyError whenever the random numerical value of x doesn't correspond to a key in the JSON data. E.g.: the JSON you gave has keys "25", "113", and "27", so if x is anything other than one of those values, you'll get an error.

What you can do instead is get a list of the keys (i.e. those numbers) in the "cards" section, and use random.choice to pick from one of the available keys.

import json
import random


def genCard():
    with open("cards.json", "r") as file:
        cards = json.load(file)
        keys = cards["cards"].keys()  # get the names of all the keys in the "cards" section
        x = random.choice(list(keys))  # choose one of those keys at random
        card = cards["cards"][x]
        print(card)
        return card


genCard()

edited Aug 19 at 17:25

answered Aug 19 at 17:19

JRiggles

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1 Comment

JRiggles Aug 19 at 17:27

Glad to help! And if it helps to clarify any further, any JSON you load into Python becomes a dictionary and can be handled like any other Python dict from that point.

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