'Unhandled exception in event loop' (WinError 995)

I started using ipython recently. Now I often get this message upon doing any action, even simple ones like defining variables:

Unhandled exception in event loop:
  File "c:\users\USER\appdata\local\programs\python\python38-32\lib\asyncio\proactor_events.py", line 768, in _loop_self_reading
    f.result()  # may raise
  File "c:\users\USER\appdata\local\programs\python\python38-32\lib\asyncio\windows_events.py", line 808, in _poll
    value = callback(transferred, key, ov)
  File "c:\users\USER\appdata\local\programs\python\python38-32\lib\asyncio\windows_events.py", line 457, in finish_recv
    raise ConnectionResetError(*exc.args)

Exception [WinError 995] The I/O operation has been aborted because of either a thread exit or an application request
Press ENTER to continue...

This message sometimes shows up, sometimes not, for the same command (Like xyz = “hello”). Have no idea what I did wrong. The normal interpreter doesn’t have this problem. Using 3.8 and installed ipython 7.10.2 through the cmd.

Thanks.

[MrEightFive]

After some investigation, I think it is a bug in Windows platform implementation of Python’s asyncio:

Python 3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 23:11:46) [MSC v.1916 64 bit (AMD64)] on Windows 10 Version 1809 (OS Build 17763.1039)

1. Add to file <path_to_python>\Lib\asyncio\proactor_events.py in function BaseProactorEventLoop._loop_self_reading after line 768 the following code:

766....try: 767........if f is not None: 768............f.result() # may raise ...........if self._stopping: ...............raise exceptions.CancelledError("Event loop is stopping") 769........f = self._proactor.recv(self._ssock, 4096)

1. Test. I have no more errors…

EDIT: you can just use if self._stopping: return instead in this particular code context (should be a bit faster)

EDIT2: Bug on bugs.python.org and description of what is causing this error (found by someone else): https://bugs.python.org/issue39010#msg362076

[KyryloKaralyus]

adding code to proactor_events.py (as MrEightFive suggested) didn’t help but pip install --upgrade prompt-toolkit==2.0.10 did . Win10 Python38.