带有 Python 3.8 的 Jupyter Notebook - NotImplementedError [英] Jupyter Notebook with Python 3.8 - NotImplementedError

问题描述

最近升级到 Python 3.8，并安装了 jupyter.但是，当尝试运行 jupyter notebook 时出现以下错误:

Upgraded recently to Python 3.8, and installed jupyter. However, when trying to run jupyter notebook getting the following error:

  File "c:usersuserappdatalocalprogramspythonpython38libsite-packages	ornadoplatformasyncio.py", line 99, in add_handler
    self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
  File "c:usersuserappdatalocalprogramspythonpython38libasyncioevents.py", line 501, in add_reader
    raise NotImplementedError
NotImplementedError

我知道 Windows 上的 Python 3.8 默认切换到 ProactorEventLoop，所以我怀疑它与此有关.

I know Python 3.8 on windows switched to ProactorEventLoop by default, so I suspect it is related to this.

Jupyter 目前不支持 Python 3.8?有解决办法吗?

Jupyter does not support Python 3.8 at the moment? Is there a work around?

推荐答案

EDIT

此问题存在于旧版本的 Jupyter Notebook 中，并在 6.0.3 版本(2020 年 1 月 21 日发布)中得到修复.要升级到最新版本，请运行:

This issue exists in older versions of Jupyter Notebook and was fixed in version 6.0.3 (released 2020-01-21). To upgrade to the latest version run:

pip install notebook --upgrade

<小时>

通过GitHub关注这个问题，看来问题与jupyter使用的tornado服务器有关.

对于那些等不及官方修复的人，我可以通过编辑文件 tornado/platform/asyncio.py 使其工作，添加:

For those that can't wait for an official fix, I was able to get it working by editing the file tornado/platform/asyncio.py, by adding:

import sys

if sys.platform == 'win32':
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

在主要进口之后.

不过，我希望官方尽快解决这个问题.

I expect an official fix for this soon, however.

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