运行命令时 IPython 崩溃

Question

I'm using IPython 7.18.1 and Python 3.8.3 on Windows 10 .

When I execute a command in IPython, it returns the result of the command but with an error. Later IPython exits. This seems to happen randomly on different terminals.

C:\Users\14116>ipython
Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:37:02) [MSC v.1924 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 7.18.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: 1
Out[1]: 1

In [2]: 2
Out[2]: 2

Traceback (most recent call last):
  File "c:\program files\python38\lib\asyncio\windows_events.py", line 430, in select
    self._poll(timeout)
RuntimeError: <_overlapped.Overlapped object at 0x0000019E0480D6F0> still has pending operation at deallocation, the process may crash
In [3]:
C:\Users\14116>

I've searched for a long time on google, but there's no result. Any ideas?

Answer 1

I'm using IPython 7.18.1 and Python 3.8.3 on Windows 10 .

When I execute a command in IPython, it returns the result of the command but with an error. Later IPython exits. This seems to happen randomly on different terminals.

C:\Users\14116>ipython
Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:37:02) [MSC v.1924 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 7.18.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: 1
Out[1]: 1

In [2]: 2
Out[2]: 2

Traceback (most recent call last):
  File "c:\program files\python38\lib\asyncio\windows_events.py", line 430, in select
    self._poll(timeout)
RuntimeError: <_overlapped.Overlapped object at 0x0000019E0480D6F0> still has pending operation at deallocation, the process may crash
In [3]:
C:\Users\14116>

I've searched for a long time on google, but there's no result. Any ideas?

Answer 2

I encountered the same problem, and asyncio version 3.4.3 was already the version that I had installed.

For me, I had a hacky solution which was to open the __init__.py file in the site-packages/IPython directory, and add the following lines somewhere during the execution of the file:

import asyncio
import platform
if platform.system() == 'Windows':
   asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

The code snippet came from the solution of "RuntimeError: <_overlapped.Overlapped object> still has pending operation at deallocation" while using aiohttp

I'll see where I can report this bug so that it can be fixed more properly.