windows下tornado报错inadd_readerraiseNotImplementedError的解决
之前的代码拿过来跑,遇到报错如下:
Traceback (most recent call last):
File ".index.py", line 325, in <module>
app.listen(8888)
File "C:Program FilesPython38libsite-packages ornadoweb.py", line 2112, in listen
server.listen(port, address)
File "C:Program FilesPython38libsite-packages ornado cpserver.py", line 152, in listen
self.add_sockets(sockets)
File "C:Program FilesPython38libsite-packages ornado cpserver.py", line 165, in add_sockets
self._handlers[sock.fileno()] = add_accept_handler(
File "C:Program FilesPython38libsite-packages ornado
etutil.py", line 279, in add_accept_handler
io_loop.add_handler(sock, accept_handler, IOLoop.READ)
File "C:Program FilesPython38libsite-packages ornadoplatformasyncio.py", line 99, in add_handler
self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
File "C:Program FilesPython38libasyncioevents.py", line 501, in add_reader
raise NotImplementedError
NotImplementedError
是由于 python3.8 asyncio 在 windows 上默认使用 ProactorEventLoop 造成的,而不是之前的 SelectorEventLoop。jupyter 依赖 tornado,而 tornado 在 window 上需要使用 SelectorEventLoop,所以产生这个报错.
请看官方文档:https://www.tornadoweb.org/en/stable/index.html#installation
解决方法是,在 tornado开始执行前添加以下代码,在windows下单独处理:
# windows 系统下 tornado 使用 使用 SelectorEventLoopimport platform
if platform.system() == "Windows":
import asyncio
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
以上是 windows下tornado报错inadd_readerraiseNotImplementedError的解决 的全部内容, 来源链接: utcz.com/z/511892.html