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lev

lev is an extremely fast Python library for the Levenshtein distance and similarity ratio, written in Rust. 🦀

Installation

uv add lev-rs

or if you prefer slow:

pip install lev-rs

Usage

import lev

lev.distance("kitten", "sitting")   # 3
lev.distance("résumé", "resume")    # 2
lev.distance("日本語", "日本")       # 1

lev.ratio("kitten", "sitting")      # 0.769...
lev.ratio("", "")                   # 1.0

For more details on the API see the API Reference.

Benchmarks

lev is benchmarked against the fastest Python Levenshtein libraries: rapidfuzz, editdistance, and edlib. We excluded slower implementations like pylev and python-Levenshtein.

Benchmarks were run on an Apple Mac Mini M2 Pro (macOS 27.0) using Python 3.13. The ASCII, Latin-1, CJK, and Emoji pairs are exactly 100 characters long; the realistic-text pair is natural-length prose. Results represent the total wall time for 1,000 repetitions using Python's timeit. To reproduce, run uv run scripts/benchmark.py.

ASCII

lev is significantly faster than the other libraries on 100-character ASCII strings.

ASCII benchmark – dark

Other Encodings

lev maintains its lead across all four CPython string-encoding kinds.

Latin-1

Latin-1 benchmark – dark

CJK

CJK benchmark – dark

Emoji

Emoji benchmark – dark

Realistic Text

This pair is a short customer support message with a handful of natural typos.

Realistic text benchmark – dark

Contact

To get in contact, please open an issue or contact me via github@markusbilz.com.

Metadata

Release files for lev-rs 0.4.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for lev-rs 0.4.0
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lev_rs-0.4.0.tar.gz 149.2 kB Details

Built distributions (wheels)

Table of built distributions (wheels) for lev-rs 0.4.0
File
lev_rs-0.4.0-cp315-cp315t-win_amd64.whl CPython 3.15 CPython 3.15 free-threading Windows x86-64 Details
lev_rs-0.4.0-cp315-cp315t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp315-cp315t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp315-cp315t-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl CPython 3.15 CPython 3.15 free-threading macOS 10.12+ x86-64, macOS 11.0+ ARM64, macOS 10.12+ universal2 (ARM64, x86-64) Details
lev_rs-0.4.0-cp315-cp315-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.15 CPython 3.15 Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp315-cp315-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.15 CPython 3.15 Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp314-cp314t-win_amd64.whl CPython 3.14 CPython 3.14 free-threading Windows x86-64 Details
lev_rs-0.4.0-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp314-cp314t-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl CPython 3.14 CPython 3.14 free-threading macOS 10.12+ universal2 (ARM64, x86-64), macOS 10.12+ x86-64, macOS 11.0+ ARM64 Details
lev_rs-0.4.0-cp314-cp314-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp314-cp314-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.14 CPython 3.14 Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp313-cp313-win_amd64.whl CPython 3.13 CPython 3.13 Windows x86-64 Details
lev_rs-0.4.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.13 CPython 3.13 Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp313-cp313-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.13 CPython 3.13 Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp313-cp313-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl CPython 3.13 CPython 3.13 macOS 10.12+ x86-64, macOS 11.0+ ARM64, macOS 10.12+ universal2 (ARM64, x86-64) Details
lev_rs-0.4.0-cp312-cp312-win_amd64.whl CPython 3.12 CPython 3.12 Windows x86-64 Details
lev_rs-0.4.0-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.12 CPython 3.12 Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp312-cp312-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl CPython 3.12 CPython 3.12 macOS 11.0+ ARM64, macOS 10.12+ universal2 (ARM64, x86-64), macOS 10.12+ x86-64 Details
lev_rs-0.4.0-cp311-cp311-win_amd64.whl CPython 3.11 CPython 3.11 Windows x86-64 Details
lev_rs-0.4.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.11 CPython 3.11 Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp311-cp311-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl CPython 3.11 CPython 3.11 macOS 10.12+ x86-64, macOS 11.0+ ARM64, macOS 10.12+ universal2 (ARM64, x86-64) Details
lev_rs-0.4.0-cp310-cp310-win_amd64.whl CPython 3.10 CPython 3.10 Windows x86-64 Details
lev_rs-0.4.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.17+ x86-64 Details
lev_rs-0.4.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.10 CPython 3.10 Linux glibc 2.17+ ARM64 Details
lev_rs-0.4.0-cp310-cp310-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl CPython 3.10 CPython 3.10 macOS 11.0+ ARM64, macOS 10.12+ x86-64, macOS 10.12+ universal2 (ARM64, x86-64) Details

Total release size: 6.7 MB

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