`assert sys.excepthook is apport_python_hook.apport_excepthook` fails with Sentry

[andersk]

Things to check first

• [X] I have searched the existing issues and didn't find my bug already reported there

• [X] I have checked that my bug is still present in the latest release

Exceptiongroup version

1.2.1

Python version

3.10.12

What happened?

When using exceptiongroup with Sentry inside a virtualenv activated with activate_this.py on Ubuntu (see the reproduction below for the exact conditions), Sentry sets sys.excepthook to a patched version of apport_python_hook.apport_excepthook with the same __name__. This breaks the assert sys.excepthook is apport_python_hook.apport_excepthook statement in exceptiongroup._formatting:

https://github.com/agronholm/exceptiongroup/blob/b91b7a34a0c688fe4bb06edcb2a0befffa21ca5f/src/exceptiongroup/_formatting.py#L374-L394

I’ve also reported this to Sentry:

• https://github.com/getsentry/sentry-python/issues/3097

But ideally this fragile assert would be fixed in exceptiongroup as well.

How can we reproduce the bug?

$ docker run --rm -it ubuntu:22.04
root@e264f830878b:/# apt update
root@e264f830878b:/# apt install -y python3-apport virtualenv
root@e264f830878b:/# virtualenv venv
root@e264f830878b:/# venv/bin/pip install exceptiongroup sentry-sdk
…
Successfully installed certifi-2024.2.2 exceptiongroup-1.2.1 sentry-sdk-2.2.1 urllib3-2.2.1
root@e264f830878b:/# cat > test.py <<EOF
exec(open("venv/bin/activate_this.py").read(), {"__file__": "venv/bin/activate_this.py"})
import sentry_sdk
sentry_sdk.init(dsn="https://[email protected]/1234")
import exceptiongroup
EOF
root@e264f830878b:/# python3 test.py
Traceback (most recent call last):
  File "//test.py", line 4, in <module>
    import exceptiongroup
  File "/venv/lib/python3.10/site-packages/exceptiongroup/__init__.py", line 20, in <module>
    from ._formatting import (
  File "/venv/lib/python3.10/site-packages/exceptiongroup/_formatting.py", line 394, in <module>
    assert sys.excepthook is apport_python_hook.apport_excepthook
AssertionError
Sentry is attempting to send 2 pending events
Waiting up to 2 seconds
Press Ctrl-C to quit