test_asyncio_gather.py

async def long_coro():
    await asyncio.sleep(1000)


async def fail_coro():
    raise ValueError


async def timeout_coro():
    print('start')
    await asyncio.wait_for(long_coro(), timeout=3)


async def wait_for_queue():
    queue = asyncio.Queue()
    await queue.get()


class TrickyClass:
    async def __aenter__(self):
        return self

    async def __aexit__(self, exc_type, exc_val, exc_tb):
        pass


async def main1():  # fail immediatelly
    await asyncio.gather(*[
        long_coro(),
        fail_coro(),
    ])


async def main2():  # fail in 3sec
    await asyncio.gather(*[
        long_coro(),
        timeout_coro(),
    ])


async def main3():  # fail immediatelly
    await asyncio.gather(*[
        fail_coro(),
        wait_for_queue(),
    ])


async def main4():  # fail in 3sec
    await asyncio.gather(*[
        timeout_coro(),
        wait_for_queue(),
    ])


async def main5():  # fail in 3sec
    async with TrickyClass() as obj:
        await asyncio.gather(*[
            timeout_coro(),
            wait_for_queue(),
        ])


import asyncio
# asyncio.get_event_loop().run_until_complete(main1())
# asyncio.get_event_loop().run_until_complete(main2())
# asyncio.get_event_loop().run_until_complete(main3())
# asyncio.get_event_loop().run_until_complete(main4())
asyncio.get_event_loop().run_until_complete(main5())