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C-based extension implementing fast integer bit sets.

Project description


intbitset is on PyPI so all you need pip:

pip install intbitset

We provide pre-built wheels for the most common operating systems and CPU architectures. Otherwise, you will need a C compiler.


The intbitset library provides a set implementation to store sorted unsigned integers either 32-bits integers (between 0 and 2**31 - 1 or intbitset.__maxelem__) or an infinite range with fast set operations implemented via bit vectors in a Python C extension for speed and reduced memory usage.

The inbitset class emulates the Python built-in set class interface with some additional specific methods such as its own fast dump and load marshalling functions.

>>> from intbitset import intbitset
>>> x = intbitset([1,2,3])
>>> y = intbitset([3,4,5])
>>> x & y
>>> x | y
intbitset([1, 2, 3, 4, 5])

Additionally, intbitset supports:

  • The pickle protocol,

  • The iterator protocol

  • intbitset can behave like a sequence that can be sliced.

  • Natural min and max. Because the integers are always stored sorted, the fist element of a non-empty set [0] is also the min() integer and the last element [-1] is also the max() integer in the set.

When compared to the standard library set class, intbitset set operations and the intersection, union and difference of intbitset``can be up to 5000 faster for dense integer sets than the standard library ``set.

Complete documentation is available at <> or can be built using Sphinx:

pip install sphinx
python build_sphinx


Running the tests are as simple as:

pip install -e .[tests]

Running the tests on multiple Python versions:

pip install tox


To regenerate the C code with Cython:

pip install cython
cython intbitset/intbitset.pyx

Then commit the regenrated C source and update the CHANGELOG.rst


Copyright (C) CERN and others

SPDX-License-Identifier: LGPL-3.0-or-later

intbitset is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

intbitset is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with intbitset; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

In applying this licence, CERN does not waive the privileges and immunities granted to it by virtue of its status as an Intergovernmental Organization or submit itself to any jurisdiction.

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