Jupyter fails to run after Scikit-learn package upgrade: module 'asyncio' has no attribute 'WindowsSelectorEventLoopPolicy'

Question

I had some issues regarding Keras wrapper and VotingClassifier so I tried upgrading sci-kit learn through Conda. But now when I try to launch it from Navigator or from a shortcut, it starts the prompt for a brief moment and then it closes. Anaconda cough this error:

Traceback (most recent call last):
File "C:\Users\vucin\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in 
from notebook.notebookapp import main
File "C:\Users\vucin\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 47, in 
from zmq.eventloop import ioloop
File "C:\Users\vucin\Anaconda3\lib\site-packages\zmq\eventloop\__init__.py", line 3, in 
from zmq.eventloop.ioloop import IOLoop
File "C:\Users\vucin\Anaconda3\lib\site-packages\zmq\eventloop\ioloop.py", line 78, in 
while _IOLoop.configurable_default() is not _IOLoop:
File "C:\Users\vucin\Anaconda3\lib\site-packages\tornado\ioloop.py", line 328, in configurable_default
from tornado.platform.asyncio import AsyncIOLoop
File "C:\Users\vucin\Anaconda3\lib\site-packages\tornado\platform\asyncio.py", line 34, in 
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
AttributeError: module 'asyncio' has no attribute 'WindowsSelectorEventLoopPolicy'

Since it got to Windows something something, I only guess that the backend is messed up badly and I don't know what to do. Uinstall is my last option since I am runing this on an old AMD based laptop and only God knows how I got Keras to run. Thanks!

This error means your environment is broken versionwise after update. Try downgrading asyncio or find a similar machine with yours and align versions to the working environment. — Sergey Bushmanov
– Sergey Bushmanov, Commented Feb 9, 2020 at 19:12

Mikko Ohtamaa · Accepted Answer · 2020-02-09 19:14:00Z

1

This is the error

AttributeError: module 'asyncio' has no attribute 'WindowsSelectorEventLoopPolicy'

If you Google the error you get someone having the same error in a different context and the suggestion is to upgrade your Python version.

As you did not mention your Python version in the question, it might worth to checl out.

You can also find this mentioned in Python release notes with some luck of Googling

answered Feb 9, 2020 at 19:14

Mikko Ohtamaa

85k63 gold badges296 silver badges479 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

rLoper Over a year ago

Negative, have to keep python 3.6 for Keras, anything else that I can do?

Mikko Ohtamaa Over a year ago

Pin packages to older versions, a known good version set you had before. Do not try to use the latest versions.

rLoper Over a year ago

Fixed it, had no choice but to update python to 3.7 then, as expected, came the Tf/Keras problem. I honestly don't know why the wheels didn't work the first time I tried them but this time I just installed them and pip installed and it worked. THanks for the help, I will mark this as an answer!

Collectives™ on Stack Overflow

Jupyter fails to run after Scikit-learn package upgrade: module 'asyncio' has no attribute 'WindowsSelectorEventLoopPolicy'

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related