PLC2701 treats `os._exit` as private, unlike SLF001

[dscorbett]

Summary

Despite its name, os._exit is not private; see #6483. import-private-name (PLC2701) treats it as private, which is inconsistent with private-member-access (SLF001). The two rules should share the same set of exceptionally non-private module members (which is currently just os._exit).

$ cat >plc2701.py <<'# EOF'
from os import _exit
# EOF

$ ruff --isolated check plc2701.py --preview --select PLC2701 --output-format concise -q
plc2701.py:1:16: PLC2701 Private name import `_exit` from external module `os`

Version

ruff 0.11.10 (b35bf8a 2025-05-15)

[danparizher]

Would the solution here not be as simple as adding this snippet to crates\ruff_linter\src\rules\pylint\rules\import_private_name.rs?:

        if matches!(import_info.qualified_name.segments(), ["os", "_exit"]) {
            continue;
        }

Are there any situations where we would need to expand on this?

[dscorbett]

That solution could work. There are other underscore-initial public module members in the standard library, though, so the list will probably be expanded at some point.