Jupyter Notebook with Python 3.8 - NotImplementedError
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 --upgradeFollowing 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 sysif 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 fileC:\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 asyncioif 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 --upgradeAnd upgrade the kernel package
pip install ipykernel --upgrade