Function sleep

Lib/asyncio/tasks.py:687–704

Coroutine that completes after a given time (in seconds).

(delay, result=None)

async def sleep(delay, result=None):
    """Coroutine that completes after a given time (in seconds)."""
    if delay <= 0:
        await __sleep0()
        return result

    if math.isnan(delay):
        raise ValueError("Invalid delay: NaN (not a number)")

    loop = events.get_running_loop()
    future = loop.create_future()
    h = loop.call_later(delay,
                        futures._set_result_unless_cancelled,
                        future, result)
    try:
        return await future
    finally:
        h.cancel()


def ensure_future(coro_or_future, *, loop=None):