Importing trio-asyncio from within IPython crashes IPython #132
Description
When running IPython 8.20.0 and trio-asyncio 0.13.0, importing trio_asyncio immediately crashes IPython:
In [1]: %config Application.verbose_crash=True In [2]: import trio_asyncio /opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/trio_asyncio/_loop.py:289: TrioAsyncioDeprecationWarning: Using trio-asyncio outside of a Trio event loop is deprecated since trio-asyncio 0.10.0 with no replacement return _trio_policy.new_event_loop() Error in sys.excepthook: Traceback (most recent call last): File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/pathlib.py", line 1250, in is_dir return S_ISDIR(self.stat().st_mode) ^^^^^^^^^ AttributeError: 'str' object has no attribute 'stat' Original exception was: Traceback (most recent call last): File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/bin/ipython", line 8, in <module> sys.exit(start_ipython()) ^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/IPython/__init__.py", line 130, in start_ipython return launch_new_instance(argv=argv, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/traitlets/config/application.py", line 1043, in launch_instance app.start() File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/IPython/terminal/ipapp.py", line 317, in start self.shell.mainloop() File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/IPython/terminal/interactiveshell.py", line 911, in mainloop self.interact() File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/IPython/terminal/interactiveshell.py", line 896, in interact code = self.prompt_for_code() ^^^^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/IPython/terminal/interactiveshell.py", line 839, in prompt_for_code text = self.pt_app.prompt( ^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/prompt_toolkit/shortcuts/prompt.py", line 1026, in prompt return self.app.run( ^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/prompt_toolkit/application/application.py", line 1002, in run return asyncio.run(coro) ^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/asyncio/runners.py", line 190, in run return runner.run(main) ^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/asyncio/runners.py", line 118, in run return self._loop.run_until_complete(task) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/trio_asyncio/_sync.py", line 125, in run_until_complete return self.__run_in_thread(self._run_coroutine, future) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/trio_asyncio/_sync.py", line 172, in __run_in_thread return res.unwrap() ^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/outcome/_impl.py", line 138, in unwrap raise captured_error File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/trio_asyncio/_sync.py", line 160, in _run_coroutine return result.unwrap() ^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/outcome/_impl.py", line 138, in unwrap raise captured_error File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/prompt_toolkit/application/application.py", line 875, in run_async loop = stack.enter_context(set_loop()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/contextlib.py", line 517, in enter_context result = _enter(cm) ^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/contextlib.py", line 137, in __enter__ return next(self.gen) ^^^^^^^^^^^^^^ File "/opt/homebrew/Caskroom/miniforge/base/envs/py311/lib/python3.11/site-packages/prompt_toolkit/application/application.py", line 789, in set_loop loop = get_running_loop() ^^^^^^^^^^^^^^^^^^ RuntimeError: no running event loop This also happens if I import trio_asyncio indirectly (e.g. inside a function).
I cannot reproduce this crash outside of IPython - importing trio-asyncio doesn't crash in the same way, even if I do it for the first time inside a running asyncio event loop.
I was on the fence as to whether to file this with IPython or trio-asyncio - it's IPython exhibiting the problem, but I suspect it's due to shenanigans that importing trio-asyncio is doing to the running asyncio event loop. If you'd rather I file this with IPython, please let me know and I'll do so.