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feat(searches): add type hints and edge-case doctests to sentinel_linear_search - #15707

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feat(searches): add type hints and edge-case doctests to sentinel_linear_search#15707
adiityakr wants to merge 2 commits into
TheAlgorithms:masterfrom
adiityakr:feat/improve-sentinel-linear-search

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@adiityakr

@adiityakr adiityakr commented Nov 11, 2026

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Describe your change

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Add or change doctests?
  • Documentation change?
  • Added Python 3 type annotations (sequence: list[Any], target: Any) -> int | None) to sentinel_linear_search.
  • Added comprehensive edge-case doctests (empty list, duplicates, negative values, strings, absent target).
  • Standardized __main__ to run doctest.testmod() per contributing guidelines.

Checklist

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing.
  • All new algorithms include at least one URL that points to Wikipedia or another similar explanation.

@adiityakr
feat(searches): add type hints and edge-case doctests to sentinel_lin…
2784410 
…ear_search

- Add type annotations (sequence: list[Any], target: Any) -> int | None
- Add comprehensive doctests covering empty list, duplicates, negative numbers, and strings
- Update return expectation for absent target (test with 'is None')
- Replace interactive input() in __main__ with doctest.testmod() per contributing guidelines
@algorithms-keeper algorithms-keeper Bot added awaiting reviews This PR is ready to be reviewed enhancement This PR modified some existing files labels Nov 11, 2026

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@adiityakr