Jupyter notebook cannot start with python 3.8 in Windows 10 [duplicate] - python-3.x

Question

This question already has answers here:
Jupyter Notebook with Python 3.8 - NotImplementedError
(4 answers)
Closed 3 years ago.
Here is the detailed error when launching jupyter notebook with python version 3.8
File "c:\users\kokat\appdata\local\programs\python\python38\lib\runpy.py", line 192, in _run_module_as_main
return _run_code(code, main_globals, None,
File "c:\users\kokat\appdata\local\programs\python\python38\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Users\kokat\AppData\Local\Programs\Python\Python38\Scripts\jupyter-notebook.EXE\__main__.py", line 9, in <module>
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\jupyter_core\application.py", line 266, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\traitlets\config\application.py", line 657, in launch_instance
app.initialize(argv)
File "<c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\decorator.py:decorator-gen-7>", line 2, in initialize
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\traitlets\config\application.py", line 87, in catch_config_error
return method(app, *args, **kwargs)
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\notebook\notebookapp.py", line 1628, in initialize
self.init_webapp()
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\notebook\notebookapp.py", line 1407, in init_webapp
self.http_server.listen(port, self.ip)
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\tornado\tcpserver.py", line 144, in listen
self.add_sockets(sockets)
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\tornado\tcpserver.py", line 157, in add_sockets
self._handlers[sock.fileno()] = add_accept_handler(
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\tornado\netutil.py", line 268, in add_accept_handler
io_loop.add_handler(sock, accept_handler, IOLoop.READ)
File "c:\users\kokat\appdata\local\programs\python\python38\lib\site-packages\tornado\platform\asyncio.py", line 79, in add_handler
self.asyncio_loop.add_reader(
File "c:\users\kokat\appdata\local\programs\python\python38\lib\asyncio\events.py", line 498, in add_reader
raise NotImplementedError
NotImplementedError
Any helps would be appreciated.

Answer 1

Following one of the comments in this thread, I've solved the problem by:
Locate and open the asyncio.py file. In my case it's in C:\Users\[USERNAME]\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\tornado\platform\
After the line import asyncio add the following:
from sys import platform
if platform == "win32":
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy()) # python-3.8.0a4
This will force using SelectorEventLoop on Windows.

Answer 2

Jupyter notebook runs as a tornado web server. Your browser connect to this tornado server via a socket.
The I/O of the socket are handled by tornado's asyncio, which relies on the add_reader implementation of the native asyncio module of python runtime. As pointed out in the documentation of asyncio, this method is only supported with Windows SelectorEventLoop so make sure you are using this kind of event loop in your python installation. To find out which eventloop implementation is in usage, you can run the following commands in python shell:
import asyncio
print(asyncio.get_event_loop().__class__)
# Output: <class 'asyncio.windows_events._WindowsSelectorEventLoop'>
There is an ongoing discussion about allowing user to change the EventLoopPolicy of asyncio in jupyter's configuration file.