An error is as follows:
C: \ Users \ Echo> Jupyter notebook
Traceback (the most recent call last) :
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ runpy py", line 192, in _run_module_as_main
Return _run_code (code, main_globals, None,
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ runpy py", line 85, in _run_code
The exec (code, run_globals)
File "C: \ Users \ Echo \ AppData \ Local \ designed \ Python \ Python38 \ Scripts \ jupyter - notebook. EXE \ __main__ py", line 7, in & lt; module>
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ jupyter_core \ application py", line 268, in launch_instance
Return super (JupyterApp, CLS). Launch_instance (argv=argv, * * kwargs)
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ traitlets \ config \ application py", line 663, in launch_instance
App. The initialize (argv)
The File "& lt; C: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ decorator. Py: decorator - gen - 7 & gt;" , line 2, the in the initialize
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ traitlets \ config \ application py", line 87, in catch_config_error
The return method (app, * args, * * kwargs)
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ notebook \ notebookapp py", line 1679, in the initialize
Self. Init_webapp ()
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ notebook \ notebookapp py", line 1442, in init_webapp
Self. Http_server. Listen (port, the self. IP)
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ tornado \ tcpserver py", line 152, listen in
Self. Add_sockets (sockets)
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ tornado \ tcpserver py", line 165, in add_sockets
Self. _handlers [sock. Fileno ()]=add_accept_handler (
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages \ tornado \ netutil py", line 279, in add_accept_handler
Io_loop. Add_handler (sock, accept_handler IOLoop. READ)
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ site - packages/tornado/platform/asyncio. Py", line 99, in add_handler
Self. Asyncio_loop. Add_reader (fd, self _handle_events, fd, IOLoop. READ)
The File "c: \ users \ echo \ appdata \ local \ designed \ python \ python38 \ lib \ asyncio \ events py", line 501, in add_reader
Raise NotImplementedError
NotImplementedError
I just installed python3.8 and the jupyter