Add LZW compression module - #2767
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Implement Lempel-Ziv-Welch (LZW) encoding and decoding under algorithms/compression, following the style of existing modules (huffman_coding, rle_compression, elias). - lzw_encode(data) returns a tuple of (codes, initial_dictionary), making the API self-contained since the decoder needs the same character-to-code mapping. - lzw_decode(codes, initial_dictionary) reconstructs the dictionary on the fly and recovers the original string. - Handles edge cases including empty input. - Adds unit tests covering encoding, decoding, round-trip, and empty input. - Exports lzw_encode and lzw_decode from compression/__init__.py.
keon
approved these changes
Jul 29, 2026
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thanks for the contribution! |
Author
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I have fixed the lint error that ruff check found (dictionary line too long). Please let me know if I should make any other modifications. Thanks! |
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Summary
Adds a new LZW (Lempel-Ziv-Welch) compression implementation to the algorithms/compression package.
Changes
Conventions
Follows existing project conventions:
Testing
All 4 LZW tests pass: