No module named 'exceptiongroup' when upgraded to starlette 0.31.0

[sfc-gh-shchen]

After upgrading to starlette 0.31.0 today, we run into the following exception when importing starlette:

from starlette import applications, requests, responses, routing
2023-07-24 15:47:43    File "/opt/conda/lib/python3.8/site-packages/starlette/applications.py", line 8, in <module>
2023-07-24 15:47:43      from starlette.middleware.base import BaseHTTPMiddleware
2023-07-24 15:47:43    File "/opt/conda/lib/python3.8/site-packages/starlette/middleware/base.py", line 14, in <module>
2023-07-24 15:47:43      from exceptiongroup import BaseExceptionGroup
2023-07-24 15:47:43  ModuleNotFoundError: No module named 'exceptiongroup'

This is likely introduced from /~https://github.com/encode/starlette/pull/2211/files

[Kludex]

I'm struggling with time, but I'll fix in the weekend if no ones open a PR to wrap it with a try..except ModuleImportError.

[benjaminpkane]

Can 0.31.0 be yanked? This is breaking installs for fiftyone

[tlpss]

Can 0.31.0 be yanked? This is breaking installs for fiftyone

Also encountered issues when using fiftyone. Manually pip installing exceptiongroup seems to fix the issue

[Kludex]

I'll release 0.31.1 shortly.