Archipelago/worlds/__init__.py

import importlib
import os

__all__ = {"lookup_any_item_id_to_name",
           "lookup_any_location_id_to_name",
           "network_data_package",
           "AutoWorldRegister"}

# import all submodules to trigger AutoWorldRegister
world_folders = []
for file in os.scandir(os.path.dirname(__file__)):
    if file.is_dir():
        world_folders.append(file.name)
world_folders.sort()
for world in world_folders:
    importlib.import_module(f".{world}", "worlds")

from .AutoWorld import AutoWorldRegister
lookup_any_item_id_to_name = {}
lookup_any_location_id_to_name = {}
games = {}

for world_name, world in AutoWorldRegister.world_types.items():
    games[world_name] = {
        "item_name_to_id" : world.item_name_to_id,
        "location_name_to_id": world.location_name_to_id,
        "version": world.data_version,
        # seems clients don't actually want this. Keeping it here in case someone changes their mind.
        # "item_name_groups": {name: tuple(items) for name, items in world.item_name_groups.items()}
    }
    lookup_any_item_id_to_name.update(world.item_id_to_name)
    lookup_any_location_id_to_name.update(world.location_id_to_name)

network_data_package = {
    "version": sum(world.data_version for world in AutoWorldRegister.world_types.values()),
    "games": games,
}

# Set entire datapackage to version 0 if any of them are set to 0
if any(not world.data_version for world in AutoWorldRegister.world_types.values()):
    network_data_package["version"] = 0
    import logging
    logging.warning(f"Datapackage is in custom mode. Custom Worlds: "
                    f"{[world for world in AutoWorldRegister.world_types.values() if not world.data_version]}")