CoinBackend has previously been available as part of the SageMath source tree, from which it is built as an "optional extension" when then cbc Sage package is installed.

However, it is not available in binary distributions such as:

• the Sage binary distribution (which does not package any optional packages),
• homebrew (which just uses the Sage binary distribution),
• Ubuntu (bionic 18.04LTS and several newer versions ship versions of SageMath, with various optional packages including CBC, but not the optional extension module CoinBackend),
• conda-forge (which ships SageMath and CBC but not the optional extension).
• Fedora

The present standalone Python package sage-numerical-backends-coin has been created from the SageMath sources, version 9.0.beta10. It can be installed on top of various Sage installations using pip, including all of the above, including older versions of Sage such as 8.1 (as shipped by Ubuntu bionic 18.04LTS).

CBC can either be installed using its Sage package using

$ sage -i cbc 

or any of the methods explained at https://github.com/coin-or/Cbc .

This package finds the CBC installation by means of pkgconfig.

Install this package from PyPI using

$ sage -python -m pip install sage-numerical-backends-coin 

or from GitHub using

$ sage -python -m pip install git+https://github.com/mkoeppe/sage-numerical-backends-coin 

(See .github/workflows/build.yml for details about package prerequisites on various systems.)

To obtain a solver (backend) instance:

sage: from sage_numerical_backends_coin.coin_backend import CoinBackend sage: CoinBackend() <sage_numerical_backends_coin.coin_backend.CoinBackend object at 0x7fb72c2c7528> 

Equivalently:

sage: from sage_numerical_backends_coin.coin_backend import CoinBackend sage: from sage.numerical.backends.generic_backend import get_solver sage: get_solver(solver=CoinBackend) <sage_numerical_backends_coin.coin_backend.CoinBackend object at 0x7fe21ffbe2b8> 

To use this solver (backend) with MixedIntegerLinearProgram:

sage: from sage_numerical_backends_coin.coin_backend import CoinBackend sage: M = MixedIntegerLinearProgram(solver=CoinBackend) sage: M.get_backend() <sage_numerical_backends_coin.coin_backend.CoinBackend object at 0x7fb72c2c7868>