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Code review: fix 5 oldest code files with type hints and improvements#14564

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JiayangLai wants to merge 2 commits intoTheAlgorithms:masterfrom
JiayangLai:code-review/fix-oldest-files-2026
Open

Code review: fix 5 oldest code files with type hints and improvements#14564
JiayangLai wants to merge 2 commits intoTheAlgorithms:masterfrom
JiayangLai:code-review/fix-oldest-files-2026

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Summary

This PR addresses code quality issues in the 5 oldest Python files in the repository (by last commit date, not updated since 2020). Each file has been audited and fixed with modern Python best practices.

Changes Made

  • searches/sentinel_linear_search.py:

    • Added type hints for function parameters and return type
    • Fixed return check (index >= len(sequence) instead of index == len(sequence))
    • Improved docstring formatting and doctest examples
    • Fixed grammar in print statement
  • sorts/pancake_sort.py:

    • Added type hints and return type annotation
    • Fixed list copying to avoid mutating input
    • Improved docstring with proper Args/Returns documentation
  • graphs/g_topological_sort.py:

    • Refactored from global variables to proper class-based design (TopologicalSort class)
    • Added comprehensive type hints
    • Added proper docstrings and examples
    • Kept functional interface for backwards compatibility
  • dynamic_programming/abbreviation.py:

    • Added type hints and early exit checks
    • Fixed malformed docstring
    • Added more comprehensive doctest examples
    • Added early exit for impossible cases
  • digital_image_processing/change_brightness.py:

    • Fixed typo: brigt_img -> bright_img
    • Added type hints
    • Fixed nested function docstring (incorrect description about "bits")
    • Fixed pixel adjustment to use int() for proper clamping
    • Added CLI interface with proper argument handling

Test plan

  • All modified files pass python -m doctest tests
  • New type hints are compatible with Python 3.9+
  • Existing functionality preserved (verified via doctests)

🤖 Generated with Claude Code

jiayang lai and others added 2 commits April 19, 2026 16:05
- searches/sentinel_linear_search.py:
  - Added type hints for function parameters and return type
  - Added Collection import
  - Fixed docstring formatting and improved examples
  - Fixed return check (index >= len(sequence) instead of index == len(sequence))
  - Fixed grammar in print statement

- sorts/pancake_sort.py:
  - Added type hints and return type annotation
  - Fixed list copying to avoid mutating input
  - Improved docstring with proper Args/Returns documentation
  - Fixed slicing syntax for clarity

- graphs/g_topological_sort.py:
  - Refactored from global variables to proper class-based design
  - Added TopologicalSort class with type hints
  - Added proper docstrings and examples
  - Kept functional interface for backwards compatibility
  - Improved main block with both class and functional examples

- dynamic_programming/abbreviation.py:
  - Added type hints and early exit checks
  - Fixed broken/malformed docstring
  - Added more comprehensive doctest examples
  - Added early exit for impossible cases

- digital_image_processing/change_brightness.py:
  - Fixed typo: brigt_img -> bright_img
  - Added type hints
  - Fixed nested function docstring (wrong description about "bits")
  - Fixed pixel adjustment to use int() for proper clamping
  - Added CLI interface with proper argument handling
  - Made image paths configurable via command line

Co-Authored-By: Claude Opus 4.6 <[email protected]>
@algorithms-keeper algorithms-keeper bot added the tests are failing Do not merge until tests pass label Apr 19, 2026
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