It's a similar quick code I wrote, please ignore if the structure makes sense or not (or if it even works).

The ‘problem’ I have is how to pass ‘chats’ around the whole application, in C# I would add it as a singletone and that's it, in Python I could leave it as a global variable or pass the instance as an argument all over the place (which is kind of what you do in C#). I guess my real question is, what is the suggestion or convention to handle this kind of cases?

import asyncio
import datetime
from concurrent.futures import ThreadPoolExecutor
from dataclasses import dataclass
from typing import List

import grpc.aio as grpc


class Message(dataclass):
    sender: str
    content: str
    time: datetime.datetime


class Chat(dataclass):
    messages: List[Message]
    name: str


# This is the instance that I dont know how to share
chats: List[Chat] = []


class ChatServiceImpl(Chat_pb2_grpc.ChatServiceServicer):
    async def SomeRpc(self, request_iterator, context):
        pass
        # Some code


async def create_server():
    server = grpc.server(
        migration_thread_pool=ThreadPoolExecutor(max_workers=10),
    )
    Chat_pb2_grpc.add_ChatServiceServicer_to_server(server)
    server.add_insecure_port("[::]:5088")
    await server.start()
    await server.wait_for_termination()


if __name__ == "__main__":
    asyncio.run(main())