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A fast implementation of Bloom filter for Python 3 built on mmap

Project description


pybloomfiltermmap3 is a Python 3 compatible fork of pybloomfiltermmap by @axiak.

The goal of pybloomfiltermmap3 is simple: to provide a fast, simple, scalable, correct library for Bloom Filters in Python.

Build Status PyPI PyPI PyPI


After you install, the interface to use is a cross between a file interface and an ste interface. As an example:

    >>> import pybloomfilter
    >>> fruit = pybloomfilter.BloomFilter(100000, 0.1, '/tmp/words.bloom')
    >>> fruit.update(('apple', 'pear', 'orange', 'apple'))
    >>> len(fruit)
    >>> 'mike' in fruit
    >>> 'apple' in fruit

To create an in-memory filter, simply omit the file location:

    >>> cakes = pybloomfilter.BloomFilter(10000, 0.1)

Caveat: It is currently not possible to persist this filter later.


Follow the official docs for pybloomfiltermmap at:


Please note that this version is specifically meant for Python 3. In case you need Python 2, please see

To install:

    $ pip install pybloomfiltermmap3

and you should be set.

History and Future

pybloomfiltermmap is an excellent bloomfiler implementation for Python 2 by @axiak and contributors. I (@prashnts) made tiny changes to add support for Python 3 sometime in 2016 as pybloomfiltermmap3 on PyPI. Since then through the help of contributors there has been incremental improvements and bugfixes while maintaining the API in v0.4.x. Since Nov. 2019, @mizvyt joined in this project and has made tons of fixes, and added support for Read-Only bloomfilters (check #12).

We're moving the new changes to v0.5.x and onwards. The goal would be to reach stability as well as add few more APIs to expand upon the use cases. While this won't be guaranteed to not remove or change the interface, the transition from v0.4.x should be quick one liners. Please open an issue if we broke your build!

Suggestions, bug reports, and/or patches are welcome!


See the LICENSE file. It's under the MIT License.

Contributions and development

When contributing, you should set up an appropriate Python 3 environment and install the dependencies listed in requirements-dev.txt. This package depends on generation of pybloomfilter.c and requires Cython to be packaged.

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pybloomfiltermmap3-0.5.0.tar.gz (479.4 kB view hashes)

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