Jupyter Notebook with Python 3.8 – NotImplementedError

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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.

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