import asyncio
import random
import traceback


def something_that_happens_later(future: asyncio.Future):
    if random.randint(0, 1):
        future.set_result('Future is done')
    else:
        future.set_exception(ValueError('Future is fail'))


async def main():
    my_future = asyncio.Future()
    asyncio.get_event_loop().call_later(2, something_that_happens_later, my_future)
    print('Waiting...')
    try:
        print(await my_future)
    except ValueError:
        traceback.print_exc()


if __name__ == '__main__':
    asyncio.get_event_loop().run_until_complete(main())