cylp

library0.94.0pypypi✓ verified 85d ago

CyLP is a Python interface for the COIN-OR Linear Programming (CLP), COIN-OR Branch and Cut (CBC), and COIN-OR Cut Generation Library (CGL) solvers. It provides a modeling layer similar to PuLP but directly wraps the COIN-OR solvers for efficient linear and mixed-integer programming. Version 0.94.0 is current; release cadence is intermittent.

data

pip install cylp

github ↗package ↗docs ↗

INSTALL

IMPORT

SIG · CYLP

cylp

datapythonv0.94.0

Install

7.9s avg

Import

1056ms

Disk

259MB

Pass rate

5/ 10

Env Coverage5 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.94.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.910 runs

build_error

glibc

py 3.10–3.910 runs

installs and imports cleanly · install 7.9s · import 1.056s · 255MB

259MB installed

● package 259MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

CyClpSimplex

✓ from cylp.cy import CyClpSimplex

✗ from cylp import CyClpSimplex

CyClpSimplex is in the cy submodule, not top-level cylp.

CbcModel

✓ from cylp.cy import CbcModel

✗ from cylp import CbcModel

Same as above, CbcModel is in cylp.cy.

Standard quickstart: define a CyLP model, create a CyClpSimplex solver, solve, and print solution.

from cylp.cy import CyClpSimplex from cylp.py.modeling.CyLPModel import CyLPModel, CyLPArray model = CyLPModel() x = model.addVariable('x', 1) y = model.addVariable('y', 1) model += 2*x + 3*y <= 10 model += x - y >= 1 model.objective = x + 2*y solver = CyClpSimplex() solver.setModel(model) solver.primal() print('x =', solver.primalVariableSolution['x']) print('y =', solver.primalVariableSolution['y'])

Debug

Known issues

deprecatedThe 'cylp.py.modeling.CyLPModel' approach is older; newer examples use 'CyClpSimplex' directly with matrix input. The modeling module may see less development.

fix

For new code, consider using CyClpSimplex.addColumn/addRow methods or switch to a more actively maintained package like PuLP if needed.

affects: 0.94.0

gotchaInstallation from source requires Cython, NumPy, and a compatible C++ compiler. Pre-built wheels may not be available for all platforms (e.g., Python 3.11+ or ARM).

fix

Use 'pip install cylp' and if it fails, ensure build dependencies are installed. Check PyPI for wheel availability.

affects: all

breakingIn versions prior to 0.90, the import path was 'cylp.CyClpSimplex' not 'cylp.cy.CyClpSimplex'. Code written for old versions will break.

fix

Update imports: change 'from cylp import CyClpSimplex' to 'from cylp.cy import CyClpSimplex'.

affects: <0.90

gotchaThe CyLP modeling layer (CyLPModel) uses 1-indexed variable IDs internally. Supplying 0-based indices may cause silent errors.

fix

Always use 1-based indexing when referring to variable IDs in lower-level API calls.

affects: all

Errors

Common errors & fixes

ImportError: cannot import name 'CyClpSimplex' from 'cylp'

Commonly occurs when using the wrong import path; CyClpSimplex is in the cylp.cy submodule.

fix

Use 'from cylp.cy import CyClpSimplex' instead of 'from cylp import CyClpSimplex'.

AttributeError: 'CyClpSimplex' object has no attribute 'primalVariableSolution'

This attribute exists only after solving with a model set via setModel. If solving directly with matrix input, use getColSolution/getRowPrice instead.

fix

After calling solver.primal(), access solution via solver.primalVariableSolution if using CyLPModel; otherwise use solver.getColSolution().

RuntimeError: CoinAssert or incorrect argument

Often caused by passing invalid column indices (0-based) when API expects 1-based indices.

fix

Ensure column/row indices start from 1, not 0. For example, in addColumn, the column numbers are 1-indexed.

Upgrade

Version history

0.94.0latest on PyPI · released Dec 3, 2025

Audit

Dependencies

numpyrequiredrequired for data structures and matrix operations

cythonoptionalrequired to compile the C extensions from source

Agent activity

10 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/coin-or/CyLP ↗

packagehttps://pypi.org/project/cylp/ ↗

docshttps://coin-or.github.io/CyLP ↗