anyioutils

anyioutils.Future behaves the same as asyncio.Future except that:

• you cannot directly await an anyioutils.Future object, but through its .wait() method (unlike an asyncio.Future, but like an asyncio.Event).
• cancelling an anyioutils.Future doesn't raise an anyio.get_cancelled_exc_class(), but an anyioutils.CancelledError.

from anyioutils import CancelledError, Future
from anyio import create_task_group, run

async def set_result(future):
    future.set_result("done")

async def cancel(future):
    future.cancel()

async def main():
    async with create_task_group() as tg:
        future0 = Future()
        tg.start_soon(set_result, future0)
        assert await future0.wait() == "done"

        future1 = Future()
        tg.start_soon(cancel, future1)
        try:
            await future1.wait()
        except CancelledError:
            assert future1.cancelled()

run(main)