async def sleep_await(seconds):
future = Future()
loop = IOLoop()
time_ = loop.time() + seconds
loop.add_timeout(Timeout(time_, lambda: future.set_result(None)))
await future
def sleep(seconds):
future = Future()
loop = IOLoop()
time_ = loop.time() + seconds
loop.add_timeout(Timeout(time_, lambda: future.set_result(None)))
yield from future
