ConnectionResetError on Python 3.8 for windows

Using the simplest feature (prompt) fails with async exception.

After running the prompt, I kept pressing a,enter.

I’m using Windows 10, prompt_toolkit.__version__ = '2.0.10'

Python 3.8.0 (tags/v3.8.0:fa919fd, Oct 14 2019, 19:21:23) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from prompt_toolkit import prompt
>>>
>>> while 1:
...     user_input = prompt('>')
...     print(user_input)
...
>a
a
>a
a
>a
a

Unhandled exception in event loop:
  File "C:\Python38\lib\asyncio\proactor_events.py", line 768, in _loop_self_reading
    f.result()  # may raise
  File "C:\Python38\lib\asyncio\windows_events.py", line 808, in _poll
    value = callback(transferred, key, ov)
  File "C:\Python38\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...
>a
a
>a
a
>a
a
>a
a

Unhandled exception in event loop:
  File "C:\Python38\lib\asyncio\proactor_events.py", line 768, in _loop_self_reading
    f.result()  # may raise
  File "C:\Python38\lib\asyncio\windows_events.py", line 808, in _poll
    value = callback(transferred, key, ov)
  File "C:\Python38\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...
>a
a
>a
a
>                                                                                                                       

[jonathanslenders]

Issue opened at bugs.python.org: https://bugs.python.org/issue39010

[jonathanslenders]

This was fixed in Python: https://github.com/python/cpython/pull/22017 Best is to upgrade to a Python version that includes the fix, like Python 3.8.7.

Otherwise, the workaround is to make sure a SelectorEventLoop is used by asyncio. See for instance how it’s done here: https://github.com/xonsh/xonsh/issues/3430