Let's say I want to write two lists and a dict to a JSON file. I can do so with the following code:

import json
x = [1, 2, 3]
y = [4, 5, 6]
z = {"1": 1, "2": 2}
with open("test.json", "a", encoding="utf-8") as f:
    json.dump(x, f)
    json.dump(y, f)
    json.dump(z, f)

But what if I want the variable names written to the file as well? My goal is to be able to read / write / append to the two lists and the dict at a later time. To do so, I would need to access them by variable name. How can I achieve this?

Howdy!

I recently took a coding test for an internship program, I was quickly put in check by the coding test. I am only about 50 hours into coding, but I had higher hopes for myself then how I performed.

The questions that tripped me up were how to take input in the form of a Dict [] and create a JSON object out of it. I was allowed to read documentation during the test and found the JSON library with json.dumps, but couldn't figure out how to use it in the allotted time. =^(

In the spirit of improvement would you fine folks of r/learnpython be willing to show how you would create a JSON object with python, and outline some reasons as to why you would want to create a JSON object in the first place? I'm hoping to learn something new, but I also hope that there are a few on this sub who can come across the post and learn something new too.

On the bright side, I solved FizzBuzz no problem. That problem gave me anxiety when I first started coding, and now I can solve it expertly. Little wins!

Thank you! =^)

My Code:  Python, (Using discord rewrite if this matters)

user_id = str(ctx.message.author.id)
        print(user_id)

        # reads data
        with open("test.json", "r") as f:
            data = json.load(f)
            print(data)
            print(type(data))

            # checks if user is in data
            if user_id not in data['users'].__str__():
                data.update({})
                print(data)

                # checks if data is type list
                if type(data) is dict:
                    data = [data]
                    print(type(data))

                # updates data with new user
                data.append({"user_id": user_id})
                print(data)
                
                # writes new data to json file
                with open("test.json", "w"):
                    json.dump(data, f)

Error Code:  Command raised an exception: UnsupportedOperation: not writable