Description:

The jupyter console is no longer functional. Pressing enter within the console produces the following python traceback regardless of the kernel or terminal emulator used:

$ jupyter-console --kernel=python
Jupyter console 6.4.4

Python 3.10.9 (main, Dec 19 2022, 17:35:49) [GCC 12.2.0]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.9.0 -- An enhanced Interactive Python. Type '?' for help.


Unhandled exception in event loop:
File "/usr/lib/python3.10/asyncio/events.py", line 80, in _run
self._context.run(self._callback, *self._args)
File "/usr/lib/python3.10/site-packages/prompt_toolkit/input/vt100.py", line 173, in callback_wrapper
callback()
File "/usr/lib/python3.10/site-packages/prompt_toolkit/application/application.py", line 707, in read_from_input
self.key_processor.process_keys()
File "/usr/lib/python3.10/site-packages/prompt_toolkit/key_binding/key_processor.py", line 270, in process_keys
self._process_coroutine.send(key_press)
File "/usr/lib/python3.10/site-packages/prompt_toolkit/key_binding/key_processor.py", line 185, in _process
self._call_handler(matches[-1], key_sequence=buffer[:])
File "/usr/lib/python3.10/site-packages/prompt_toolkit/key_binding/key_processor.py", line 320, in _call_handler
handler.call(event)
File "/usr/lib/python3.10/site-packages/prompt_toolkit/key_binding/key_bindings.py", line 124, in call
result = self.handler(event)
File "/usr/lib/python3.10/site-packages/jupyter_console/ptshell.py", line 477, in _
self.handle_iopub()
File "/usr/lib/python3.10/site-packages/jupyter_console/ptshell.py", line 854, in handle_iopub
while run_sync(self.client.iopub_channel.msg_ready)():
File "/usr/lib/python3.10/site-packages/jupyter_core/utils/__init__.py", line 147, in run_sync
raise AssertionError

Exception
Press ENTER to continue...

It seems this is an upstream bug, but recording here since afaict it affects all users of jupyter_console on Arch. This is what I could find for upstream reports: https://github.com/jupyter/jupyter_console/issues/277.