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Restructure repo for educational clarity#2717

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keon merged 11 commits into
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refactor/restructure-for-education
Feb 17, 2026
Merged

Restructure repo for educational clarity#2717
keon merged 11 commits into
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refactor/restructure-for-education

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@keon keon commented Feb 17, 2026

Summary

  • Phase 0: Modernize codebase with type hints, docstrings, explicit __init__.py exports, and CI update
  • Phase 1: Remove niche/orphan modules (automata/, ml/, distribution/, unix/)
  • Phase 2: Create algorithms/data_structures/ package — extract stack, queue, heap, hash table, linked list, graph DS, union-find into centralized location with backward-compatible re-exports
  • Phase 3-4: Rename packages to follow Python conventions (arrays→array, strings→string, bit→bit_manipulation, backtrack→backtracking, sort→sorting, search→searching, dp→dynamic_programming, maths→math, linkedlist→linked_list, queues→queue)
  • Phase 5: Merge bfs/ and dfs/ into graph/ — BFS/DFS are techniques, not categories
  • Phase 6-7: Move misplaced algorithms (top_sort → graph/, unionfind/count_islands → graph/)
  • Phase 8: Flatten tree subdirectories — move tree DS (BST, AVL, trie, segment tree, fenwick tree, red-black tree, B-tree) to data_structures/, flatten algorithm files into tree/ with prefixed names
  • Phase 9: Consolidate TreeNode — single canonical definition in common/tree_node.py as a dataclass
  • Phase 10: Remove old DS source files, convert graph/graph.py to re-export shim
  • Phase 11: Expose data_structures in top-level __init__.py, delete stale C file, final cleanup

Test plan

  • All 414 tests pass after every phase
  • Backward-compatible re-exports maintained — existing import paths still work
  • git mv used for all moves to preserve file history
  • Verify CI passes on this branch
  • Manual review of new directory structure for educational clarity

🤖 Generated with Claude Code

keon and others added 11 commits February 17, 2026 05:03
@keon @claude
Modernize codebase: type hints, docstrings, explicit imports, and CI …
97d8ef5 
…update

Phase 0 of the educational algorithms repo refactor:

- Add type annotations and PEP 257 docstrings with complexity analysis to all
  290+ algorithm and data structure modules
- Replace wildcard imports with explicit imports and __all__ lists across all
  __init__.py files
- Extract shared data structures (TreeNode, ListNode, Graph) into
  algorithms/common/
- Migrate build config from setup.py/tox/Travis to pyproject.toml and GitHub
  Actions
- Remove obsolete .coveragerc, .travis.yml, tox.ini, requirements.txt
- Add py.typed marker for PEP 561 type-checking support
- Add Phase 0 discovery tooling (tools/) and audit reports (docs/internal/)
- Add refactor.md roadmap for subsequent restructuring phases
- All 422 tests passing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Remove niche/orphan modules: automata, ml, distribution, unix
a30e7a4 
These modules don't fit the educational algorithms focus:
- automata/dfa.py: isolated DFA simulator with no related modules
- ml/nearest_neighbor.py: single ML algorithm in an algorithms repo
- distribution/histogram.py: trivial frequency counter (reimplements Counter)
- unix/path/: OS path utilities, not classical algorithms

Removes 4 corresponding test files. No other modules depend on these.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Create algorithms/data_structures/ package with core DS implementations
432e5ba 
Copies stack, queue, priority queue, heap, hash table, linked list, graph,
and union-find data structures into a dedicated data_structures/ package.
Old __init__.py files updated to re-export from the new location, so all
existing imports continue to work unchanged.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Rename packages: arrays→array, strings→string, bit→bit_manipulation, …
f16c5ef 
…backtrack→backtracking

Clearer names that follow Python naming conventions:
- arrays/ → array/ (singular, matches the data type)
- strings/ → string/ (singular)
- bit/ → bit_manipulation/ (descriptive of the technique)
- backtrack/ → backtracking/ (standard algorithmic term)

All __init__.py import paths and test imports updated accordingly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Rename packages: sort→sorting, search→searching, dp→dynamic_programmi…
2e7063b 
…ng, maths→math, linkedlist→linked_list, queues→queue

Descriptive names that match standard algorithmic terminology:
- sort/ → sorting/ (category name)
- search/ → searching/ (category name)
- dp/ → dynamic_programming/ (spell out the technique)
- maths/ → math/ (standard term)
- linkedlist/ → linked_list/ (snake_case per PEP 8)
- queues/ → queue/ (singular, matches the data type)

Fixes cross-module imports in math/chinese_remainder_theorem.py and
math/symmetry_group_cycle_index.py. All test files renamed and updated.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Merge bfs/ and dfs/ into graph/ — techniques, not categories
6a6a863 
BFS and DFS are traversal techniques, not top-level algorithm categories.
Moves all files from bfs/ and dfs/ into graph/, renaming where conflicts
exist (count_islands_bfs.py, count_islands_dfs.py, etc.).

Merges test_bfs.py, test_dfs.py, and test_topological.py into test_graph.py.
Deletes the now-empty bfs/ and dfs/ directories.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Complete repo restructuring: Phases 6-11
caaa7c7 
- Phase 6: Move top_sort.py from sorting/ to graph/topological_sort_dfs.py
- Phase 7: Move unionfind/count_islands.py to graph/count_islands_unionfind.py,
  import Union from data_structures, delete unionfind/
- Phase 8: Flatten tree subdirectories — move tree DS (BST, AVL, trie,
  segment tree, fenwick tree, red-black tree, B-tree) to data_structures/,
  flatten traversal/bst/trie algorithm files into tree/ with prefixed names
- Phase 9: Consolidate TreeNode — tree/tree.py now re-exports from
  common/tree_node.py dataclass
- Phase 10: Remove old DS source files (stack.py, queue.py, etc.) now that
  __init__.py files re-export from data_structures/; convert graph/graph.py
  to re-export shim
- Phase 11: Expose data_structures in top-level __init__.py, add tree DS
  exports to data_structures/__init__.py, delete stale C file

All 414 tests pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Rewrite README and clean up stale docs
ca69aa2 
- Rewrite README.md to reflect the new project structure with accurate
  file paths, organized data structures table, and complete algorithm
  listing grouped by topic
- Remove stale Sphinx docs (old .rst files referencing pre-rename packages)
- Remove internal Phase 0 audit documents (docs/internal/phase0/)
- Remove legacy setup.py (pyproject.toml is now authoritative)
- Remove refactoring planning files (refactor.md, PHASE_0_SUMMARY.txt)
- Remove one-off migration tools (tools/)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Fix CI: build backend, linter config, and lint errors
c0e065b 
- Fix pyproject.toml build-backend: use setuptools.build_meta
  (setuptools.backends._legacy:_Backend does not exist)
- Remove license classifier conflicting with PEP 639 license field
- Narrow ruff lint rules to F (Pyflakes) + I (isort) to match
  codebase reality; ignore F401 for intentional re-exports
- Increase line-length to 120 to avoid pre-existing E501 noise
- Auto-fix 49 import sorting issues (ruff --fix)
- Fix F841: remove unused variable in ResizableHashTable.put()
- Fix F811: rename duplicate TestCountBinarySubstring class to
  TestRepeatString (was silently shadowing a test — now 415 pass)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Fix all 737 ruff lint errors with strict rules restored
5965663 
Restore original strict ruff rule set ["E", "W", "F", "I", "N", "UP", "B", "SIM"]
and fix every violation across 189 files instead of loosening the linter config.

Fixes applied:
- ruff format: 395 whitespace issues (W191 tabs, W291/W293 trailing, E101 mixed)
- ruff check --fix: 129 auto-fixable (I001 isort, UP type-hint upgrades, SIM simplifications)
- Manual fixes: 146 remaining (N class naming, E501 line length, F811/F841 unused,
  B027 empty methods, E741 ambiguous variable names like l→left, V→vertices)
- Renamed duplicate TestCountBinarySubstring → TestRepeatString in test_string.py,
  recovering 1 previously shadowed test (414 → 415 tests now pass)

All checks passed: ruff clean, 415 tests green.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon @claude
Add descriptions and examples to README
2c49ca9 
Every algorithm entry now includes a one-line description explaining
what it does. Added 7 usage examples covering graph, DP, backtracking,
data structures, searching, tree traversal, and string matching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@keon keon merged commit 7f80fa3 into main Feb 17, 2026
4 checks passed
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