[Feature] Extend selector error message

[jan-janssen]

Summary by CodeRabbit

• Bug Fixes
  • Improved handling when selecting values from returned data: invalid or non-existent selectors now produce clearer error messages to help identify mismatches between requested selectors and actual results. The behavior for empty/null results remains unchanged.

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[coderabbitai]

📝 Walkthrough

Walkthrough

FutureSelector.result now guards access to result[self._selector]: it returns the indexed value only when the selector is an int and result is a tuple/list, or when the selector exists as a key in the result; otherwise it raises a detailed KeyError. None results still return None.

Changes

Cohort / File(s)	Summary
FutureSelector change src/executorlib/standalone/select.py	Replace unconditional indexing with guarded access: allow integer indexing into sequences or keyed lookup into mappings; when lookup fails, raise a KeyError with selector and result-type details; preserve None handling.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• FutureSelector: More generic interface to concurrent.futures.Future #824: Modified FutureSelector.result to perform selector-based indexing; this PR and the current one touch the same method and related behavior.

Poem

🐰 I peeked inside a result with care,
"Are you a list, tuple, or keyed affair?"
If keys are missing, I bark a KeyError drum,
Else out pops the value — hop, here we come! 🥕

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: extending the error message for selector operations by adding guarded access and detailed error reporting.

✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3281a55 and e2bba51.

📒 Files selected for processing (1)

• src/executorlib/standalone/select.py

🧰 Additional context used

🧬 Code graph analysis (1)

src/executorlib/standalone/select.py (1)

src/executorlib/task_scheduler/file/shared.py (1)

• result (24-38)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (4)

• GitHub Check: unittest_slurm_mpich
• GitHub Check: benchmark (ubuntu-latest, 3.13, .ci_support/environment-mpich.yml)
• GitHub Check: unittest_win
• GitHub Check: benchmark (ubuntu-latest, 3.13, .ci_support/environment-openmpi.yml)

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.22%. Comparing base (b92cfdb) to head (0e937b9).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/executorlib/standalone/select.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #875      +/-   ##
==========================================
- Coverage   93.27%   93.22%   -0.05%     
==========================================
  Files          38       38              
  Lines        1800     1802       +2     
==========================================
+ Hits         1679     1680       +1     
- Misses        121      122       +1     

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