python - 如何使用 websocket 库消除此错误？

Question

我根据 https://websockets.readthedocs.io/en/stable/intro.html#python-lt-36 中的示例拼凑了以下代码这在 Python 3.6+ 中无疑会更简单，但不幸的是我使用的发行版 (Raspbian) 托管 Python 3.5.3。显然，我做错了什么，但我不知道是什么。我做错了什么，有更简单的方法吗？

def my_callback1(channel):  # Down Arrow Pressed
    Return, Cursor = update.upArrow()
    if Return:
        message = "Control, " + str(Cursor)
        asyncio.get_event_loop().run_until_complete(SendMessage(message))

@asyncio.coroutine
def SendMessage(message):
    websocket = yield from websockets.connect('ws://localhost:8000')
    try:
        yield from websocket.send(message)
    finally:
        yield from websocket.close()

GPIO.add_event_detect(pinsarrow[0], GPIO.RISING, callback=my_callback1, bouncetime=bTime)  # Down Arrow

Traceback (most recent call last):
  File "/usr/local/sbin/button.py", line 25, in my_callback1
    asyncio.get_event_loop().run_until_complete(SendMessage(message))
  File "/usr/lib/python3.5/asyncio/events.py", line 671, in get_event_loop
    return get_event_loop_policy().get_event_loop()
  File "/usr/lib/python3.5/asyncio/events.py", line 583, in get_event_loop
    % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'Dummy-1'.

Answer 1

这是完整的解决方案，感谢 shmee:

def my_callback1(channel):  # Down Arrow Pressed
    Return, Cursor = update.downArrow()
    if Return:
        message = "Control, " + str(Cursor)
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
        loop.run_until_complete(SendMessage(message))
@asyncio.coroutine
def SendMessage(message):
    websocket = yield from websockets.connect('ws://localhost:8000')
    try:
        yield from websocket.send(message)
    finally:
        yield from websocket.close()

GPIO.add_event_detect(pinsarrow[0], GPIO.RISING, callback=my_callback1, bouncetime=bTime)  # Down Arrow