Add a results property to a nursery, containing the return values of the functions which have been started (and finished).

result_nursery.py

from functools import wraps

import trio


def set_result(results, key, func):
    @wraps(func)
    async def wrapper(*args, **kwargs):
        results[key] = await func(*args, **kwargs)

    return wrapper


class ResultNurseryManager:
    def __init__(self):
        self.nursery_manager = trio.open_nursery()

    async def __aenter__(self):
        nursery = await self.nursery_manager.__aenter__()
        nursery.results = {}

        def start_soon_result(name, async_fn, *args):
            nursery.start_soon(
                set_result(nursery.results, name, async_fn), *args, name=name
            )

        nursery.start_soon_result = start_soon_result
        return nursery

    async def __aexit__(self, etype, exc, tb):
        await self.nursery_manager.__aexit__(etype, exc, tb)


async def get_status(msg):
    return f"{msg} status"


async def get_statuses():
    async with ResultNurseryManager() as nursery:
        nursery.start_soon_result("a", get_status, "aaa")
        nursery.start_soon_result("b", get_status, "bbb")
    print(f"Status A: {nursery.results['a']}")
    print(f"Status B: {nursery.results['b']}")


trio.run(get_statuses)