mmh3

Python extension for MurmurHash (MurmurHash3), a set of fast and robust hash functions.

mmh3 Permissive license MIT License Copyright (c) 2011-2026 Hajime Senuma Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to… (full text in the JSON record) Active ★ 374 v5.2.1 released 2026-03-05

Install

mmh3 on PyPI

pip

pip install mmh3

uv

uv add mmh3

poetry

poetry add mmh3

Package facts

License	MIT License Copyright (c) 2011-2026 Hajime Senuma Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to… (full text in the JSON record) (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	medium — platform-specific wheel
Runtime dependencies	none
Maintenance	actively maintained — 161 days since the last release
Last repo commit	2026-08-10
First released	2011-06-07
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: mmh3-5.2.1-cp310-cp310-macosx_10_9_universal2.whl; mmh3-5.2.1-cp310-cp310-macosx_10_9_x86_64.whl; mmh3-5.2.1-cp310-cp310-macosx_11_0_arm64.whl; mmh3-5.2.1-cp310-cp310-manylinux1_i686.manylinux_2_28_i686.manylinux_2_5_i686.whl; mmh3-5.2.1-cp310-cp310-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl; mmh3-5.2.1-cp310-cp310-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl; mmh3-5.2.1-cp310-cp310-manylinux2014_ppc64le.manylinux_2_17_ppc64le.manylinux_2_28_ppc64le.whl; mmh3-5.2.1-cp310-cp310-manylinux2014_s390x.manylinux_2_17_s390x.manylinux_2_28_s390x.whl; mmh3-5.2.1-cp310-cp310-musllinux_1_2_aarch64.whl; mmh3-5.2.1-cp310-cp310-musllinux_1_2_i686.whl; mmh3-5.2.1-cp310-cp310-musllinux_1_2_ppc64le.whl; mmh3-5.2.1-cp310-cp310-musllinux_1_2_s390x.whl; mmh3-5.2.1-cp310-cp310-musllinux_1_2_x86_64.whl; mmh3-5.2.1-cp310-cp310-win32.whl; mmh3-5.2.1-cp310-cp310-win_amd64.whl; mmh3-5.2.1-cp310-cp310-win_arm64.whl; mmh3-5.2.1-cp311-cp311-macosx_10_9_universal2.whl; mmh3-5.2.1-cp311-cp311-macosx_10_9_x86_64.whl; mmh3-5.2.1-cp311-cp311-macosx_11_0_arm64.whl; mmh3-5.2.1-cp311-cp311-manylinux1_i686.manylinux_2_28_i686.manylinux_2_5_i686.whl

Keywords: utility, hash, MurmurHash

Development Status :: 5 - Production/StableIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Free Threading :: 2 - BetaTopic :: Software Development :: LibrariesTopic :: Utilities

About mmh3

from the package's own PyPI description — quoted content, verbatim

mmh3

Documentation Status (image) GitHub Super-Linter (image) Build (image) PyPi Version (image) Python Versions (image) License: MIT (image) Total Downloads (image) [![Recent...

Read as markdown · JSON record · Source repository · Homepage · Docs

AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

mmh3 is a Python extension for MurmurHash3, providing fast non-cryptographic hash functions optimized for probabilistic data structures like Bloom filters and MinHash, as well as favicon hashing.

Medium install friction due to compiled wheels; however, prebuilt binaries are available for Python 3.10–3.14 across major platforms (Linux, macOS, Windows, and mobile), and the project is actively maintained with recent releases.

MIT license permits unrestricted use, modification, and distribution in both open-source and commercial projects, with only attribution and license notice required.

Usage

pip install mmh3

import mmh3
result = mmh3.hash(b"foo")  # returns -156908512 (32-bit signed int)
unsigned_result = mmh3.hash(b"foo", 0, False)  # returns 4138058784 (unsigned)

Requires Python 3.10 or later (supports 3.10–3.14, including 3.14 no-GIL variant).

Verdict: mmh3 is a stable, actively maintained library with zero known vulnerabilities, broad platform coverage via prebuilt wheels, and permissive MIT licensing. It is well-suited for production use in applications requiring fast, non-cryptographic hashing for probabilistic data structures and favicon fingerprinting.

Needs verification

Whether the no-GIL variant (Python 3.14t) thread-safety issues mentioned in the changelog have been fully resolved since version 5.2.0.
Performance characteristics and suitability for specific use cases (e.g., scale of data, latency requirements) beyond the documented examples.

murmur hash pythonfast non-cryptographic hashingbloom filter hash functionsminhash implementationfavicon hash calculationfeature hashing libraryhigh-performance hash functions