coin-or/pulp

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A python Linear Programming API

Stars: 2.5k
Forks: 432
Open beginner issues: 0
Indexed issues: 33

Dominant language: Python
License: No license data
Last GitHub push: Aug 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted
PR merge metrics: No merged PRs in 30d

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33 open issues indexed

Repeated variable __dummy when used with copy() Open

coin-or/pulp#175 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
PuLP returns None for variables that have zero coefficients both in objective and constraints. Open

coin-or/pulp#331 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow longer variable names when Solving an LP? Open

enhancement

coin-or/pulp#381 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Correctly implement solver status and solution status and document it. Open

coin-or/pulp#383 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Examples with Solver Callbacks Open

docs

coin-or/pulp#443 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Model Solution Status for Gurobi Seems Wrong Open

gurobi

coin-or/pulp#445 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SCIP interface does not read solution when problem not solved Open

SCIP

coin-or/pulp#451 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Reading MPS Files Open

lp/mps

coin-or/pulp#459 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
More efficient resolve when change in objective function only Open

enhancement

coin-or/pulp#497 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow capturing logs as string Open

good first issue help wanted

coin-or/pulp#502 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problem read from MPS is solved incorrectly Open

lp/mps

coin-or/pulp#511 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add status code for early termination with feasible solution Open

coin-or/pulp#568 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
options setting in different solver apis can be unified Open

enhancement

coin-or/pulp#638 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Can't use options file with HiGHS_CMD solver Open

HiGHs

coin-or/pulp#648 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
HiGHS_CMD - .sol file only has values of the decision variables ; not their names Open

HiGHs

coin-or/pulp#667 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
why clp can return solution even the problem is infeasible Open

CBC

coin-or/pulp#669 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
CPLEX LP file processing error - missing right-hand side Open

cplex

coin-or/pulp#695 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
CBC Solver Hangs on Certain MPS Problems -- PuLP Should Handle More Gracefully Open

CBC

coin-or/pulp#699 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
timeLimit Parameter Ignored in pulp.FSCIP_CMD Solver Open

SCIP

coin-or/pulp#707 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[BUG] Suspecting wrong return of LpStatusOptimal when using `CBC` Open

CBC

coin-or/pulp#711 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
PuLP does not correctly read a class of MPS files in MILIB2017 Open

lp/mps

coin-or/pulp#790 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unsupported bound type `MI` in `pulp.LpProblem.fromMPS` Open

lp/mps

coin-or/pulp#791 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Solver fails if TMPDIR includes a space Open

coin-or/pulp#811 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
TypeError when LpAffineExpressions are Specified Using Decimals Open

coin-or/pulp#815 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Test pulp.tests.test_pulp.HiGHS_CMDTest.test_time_limit_no_solution fails on non-x86 architectures Open

HiGHs

coin-or/pulp#832 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SCIP_PY reporting inexistent solution Open

SCIP

coin-or/pulp#876 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Setting `primal_feasibility_tolerance` for `pulp.HiGHS` solving Open

HiGHs

coin-or/pulp#882 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Adding Artelys Knitro solver API in PuLP Open

enhancement

coin-or/pulp#883 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Unsupported bound type "MI" Open

lp/mps

coin-or/pulp#886 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
different behavior with different versions of highs solver Open

HiGHs

coin-or/pulp#887 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
logPath Parameter Ignored in pulp.FSCIP_CMD Solver Open

bug SCIP

coin-or/pulp#892 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Rust `Category.Binary` is a dead code Open

coin-or/pulp#932 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Cannot modify constraints after adding to problem Open

coin-or/pulp#933 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

coin-or/pulp

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