from usr import uasyncio as asyncio
async def barking(n):
    print('Start barking')
    for _ in range(6):
        await asyncio.sleep(1)
    print('Done barking.')
    return 2 * n
async def foo(n):
    print('Start timeout coro foo()')
    while True:
        await asyncio.sleep(1)
        n += 1
    return n
async def bar(n):
    print('Start cancellable bar()')
    while True:
        await asyncio.sleep(1)
        n += 1
    return n
async def do_cancel(task):
    await asyncio.sleep(5)
    print('About to cancel bar')
    task.cancel()
async def main():
    tasks = [asyncio.create_task(bar(70))]
    tasks.append(barking(21))
    tasks.append(asyncio.wait_for(foo(10), 7))
    asyncio.create_task(do_cancel(tasks[0]))
    res = None
    try:
        # return_exceptions=True, 默认为False，即在任何协程引发异常时立即中止并引发异常。 如果设置为True，则将异常包装在结果中返回。
        res = await asyncio.gather(*tasks, return_exceptions=True)
    except asyncio.TimeoutError:  # These only happen if return_exceptions is False
        print('Timeout')  # With the default times, cancellation occurs first
    except asyncio.CancelledError:
        print('Cancelled')
    print('Result: ', res)
asyncio.run(main())