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.
Prerequisite: Python While Jupyter runs code in many programming languages, Python is a requirement (Python 3.3 or greater, or Python 2.7) for installing the Jupyter Notebook. We recommend using the Anaconda distribution to install Python and Jupyter.
Windows File Explorer + Command Prompt Once you've entered your specific folder with Windows Explorer, you can simply press ALT + D, type in cmd and press Enter. You can then type jupyter notebook to launch Jupyter Notebook within that specific folder.
Jupyter doesn't load or doesn't work in the browserTry disabling any browser extensions and/or any Jupyter extensions you have installed. Some internet security software can interfere with Jupyter. If you have security software, try turning it off temporarily, and look in the settings for a more long-term solution.
In the JupyterLab folder File Browser, select the folder where you want to clone the GitHub repository. For example, the home folder. Click the Git clone button. In the Clone a repo dialog, paste the URL for your GitHub repository that you copied earlier.
Following one of the comments in this thread, I've solved the problem by:
C:\Users\[USERNAME]\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\tornado\platform\
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.
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.
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