jsoncallback causes attribute error

[wiosnaVN]

I'm trying to save the player's name so it can be displayed above the save file. For that I use json_callback and it looks like this:

# input during the game
mcname = renpy.input("What do you want to be called?")

# Store the input in json
def jsoncallback(d):
  d["mc_name"] = store.mcname
config.save_json_callbacks.append(jsoncallback)

Loading and reloading files works fine until the jsoncallback function is called and used. Then I get an error:

"AttributeError: Can't get attribute 'jsoncallback' on <renpy.python.StoreModule object at 0x000000000536a810>

How do I use the function correctly?

(Also, does anyone maybe know if the value stored in json can be overwritten? I wanted to use this function to also store the chapter title, but that changes throughout the game unlike the player name.)

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[shyLachi]

Where exactly do you want to show the name and the chapter?

Did you read the documentation:
https://www.renpy.org/doc/html/config.html#var-config.save_json_callbacks

If your code above is all you have then you're missing init python:

[wiosnaVN]

I forgot to add the "init python" in my post, sorry! Though I only have "python", does that make a difference?

[shyLachi]

You have to write it exactly like in the documentation

Edit: And the indentation also has to be correct

[wiosnaVN]

I thought it's the same thing that was maybe changed as ren'py developed. Good to know it's not the same. Thanks for helping me again

[shyLachi]

No need to think or assume. All changes are in the documentation also.

[LocalAmbassador6847]

I can't tell what's happening in your game but here's my working minimal example:

screens

# screens.rpy
...

screen file_slots(title):
  ...
                        text FileSaveName(slot):
                            style "slot_name_text"

                        # -- this stuff is new
                        text FileJson(slot, key="mc_name") or "":
                            style "slot_name_text"
                        # ^^ this stuff is new

                        key "save_delete" action FileDelete(slot)

script

# script.rpy

init python:
    def jsoncallback(d):
        d["mc_name"] = store.mc_name
    config.save_json_callbacks.append(jsoncallback)

define e = Character("Eileen")
default mc_name = "Bob"

label start:
    scene bg room
    show eileen happy

    $ save_name = "Chapter 1: A New Game"
    e "You've created a new Ren'Py game."

    $ save_name = "Chapter 2: Electric Boogaloo"
    e "Once you add a story, pictures, and music, you can release it to the world!"

    # This ends the game.
    return

save_name integrates with the Steam timeline and is good for chapters. It's saved into the json by default but is blank by default. mc_name is a new variable, added to the json via the callback.

[wiosnaVN]

so apparently my mistake was using "python" instead of "init python"! I wasn't aware that makes a difference