Upgraded recently to Python 3.8, and installed jupyter
. However, when trying to run jupyter notebook
getting the following error:
File "c:\users\user\appdata\local\programs\python\python38\lib\site-packages\tornado\platform\asyncio.py", line 99, in add_handler
self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
File "c:\users\user\appdata\local\programs\python\python38\lib\asyncio\events.py", line 501, in add_reader
raise NotImplementedError
NotImplementedError
I know Python 3.8 on windows switched to ProactorEventLoop
by default, so I suspect it is related to this.
Jupyter does not support Python 3.8 at the moment? Is there a work around?
EDIT
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
Following on this issue through GitHub, it seems the problem is related to the tornado
server that jupyter uses.
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())
After the main imports.
I expect an official fix for this soon, however.
Revising the answer in 2019
Change the end part of the file
C:\Users\{USER-NAME}\AppData\Local\Programs\Python\Python38\Lib\asyncio\__init__.py
From
if sys.platform == 'win32': # pragma: no cover
from .windows_events import *
__all__ += windows_events.__all__
else:
from .unix_events import * # pragma: no cover
__all__ += unix_events.__all__
To
import asyncio
if sys.platform == 'win32':
from .windows_events import *
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
__all__ += windows_events.__all__
else:
from .unix_events import * # pragma: no cover
__all__ += unix_events.__all__
For me, I had to reinstall asyncio
pip install asyncio --upgrade
And upgrade the kernel package
pip install ipykernel --upgrade
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