Issues sending an array with JSON (TypeError: Object of type set is not JSON serializable)-CodePudding

I'm trying to send a request to a server with some JSON, but I keep getting a TypeError about it not being serialized. I tried json=data and using headers, but it keeps throwing that error.

Could this be the variables inside the request, or something else?

Short Error:

TypeError: Object of type set is not JSON serializable

Traceback:

Ignoring exception in command limiteds:
Traceback (most recent call last):
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "C:\Users\foo\Documents\Programs\Python\foo.py", line 471, in limiteds
    send_trade = requests.post(send_trade_api,data=json.dumps(req), headers=headers)
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\json\__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\json\encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\json\encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\json\encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type set is not JSON serializable

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

Traceback (most recent call last):
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\bot.py", line 939, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\core.py", line 863, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "C:\Users\foo\AppData\Local\Programs\Python\Python310\lib\site-packages\discord\ext\commands\core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
**discord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: Object of type set is not JSON serializable**

Full Code:

    req = {
    "offers": [
        {
            "userId": {our_userid},
            "userAssetIds": [
                {our_userAssetId}
            ],
            "robux": 0
        },
        {
            "userId": {userid},
            "userAssetIds": [
                {userAssetId}
            ],
            "robux": 0
        }
    ]}

    headers = {'Content-Type': 'application/json', 'Accept':'application/json'}

    send_trade_api = 'https://trades.roblox.com/v1/trades/send'

    send_trade = requests.post(send_trade_api,data=json.dumps(req), headers=headers)

CodePudding user response：

This:

"userAssetIds": [
    {our_userAssetId}
],

And this:

"userAssetIds": [
    {userAssetId}
],

Are sets in lists. To avoid that you should just write the code this way:

"userAssetIds": [
    our_userAssetId,
],

The sets are predefined by similar syntax like dicts, but there are no : separators, so set is defined for example by using syntaxes like:

{1}
...
{1, 2, 3}

Also you need to change your userId key value too.

CodePudding user response：

You better use list instead of set when converting to json, but if your really need to use set should deal without third-party modules (I think there are still some sophistications to do this manually).

But the reciever will still get list.

Just check this instruction: https://appdividend.com/2022/06/23/python-set-to-json/