added download of highs binary. And fixed errors in subprocess (#759)

* added download of highs binary. And fixed errors in subprocess

* remove the prints. Show available solvers

* workaround to deactivate messages on licenses

* make it compatible with windows

* tests on windows.

* linter

* keep msg=True when detecting solvers since it's blocking the print of available solver.

* more tests

* undo hiding messages

* clean comments

.github/workflows/pythonpackage.yml

@@ -49,6 +49,14 @@ jobs:
         # alternatively if: contains(fromJSON("['3.7', '3.8', '3.9', '3.10', '3.11']"), matrix.python-version)
         run: |
           pip install highspy numpy
+      - name: Install highspy cmd
+        if: matrix.os == 'ubuntu-latest'
+        uses: supplypike/setup-bin@v4
+        with:
+          uri: 'https://github.com/JuliaBinaryWrappers/HiGHSstatic_jll.jl/releases/download/HiGHSstatic-v1.7.1%2B0/HiGHSstatic.v1.7.1.x86_64-linux-gnu-cxx11.tar.gz'
+          subPath: 'bin'
+          name: 'highs'
+          version: '1.7.1'
       - name: Install coptpy
         run: |
           pip install coptpy

HISTORY

@@ -2,6 +2,11 @@
 #       Copyright S.A.Mitchell ([email protected]), 2007-
 #       Copyright F.Peschiera ([email protected]), 2019-
 # See the LICENSE file for copyright information.
+2.9.0 2024-07-12
+    HiGHS available as solver
+    added HiGHS_CMD to github actions
+    deactivated warnings on msg=False
+    minor fixes
 2.8.0 2024-01-12
     mip start in HiGHS_CMD and SCIP_PY
     GUROBI solver with environment handling

pulp/apis/__init__.py

@@ -151,7 +151,7 @@ def listSolvers(onlyAvailable=False):
     """
     result = []
     for s in _all_solvers:
-        solver = s()
+        solver = s(msg=False)
         if (not onlyAvailable) or solver.available():
             result.append(solver.name)
         del solver

pulp/apis/coin_api.py

@@ -182,8 +182,10 @@ def solve_CBC(self, lp, use_mps=True):
                 "Pulp: Error while trying to execute, use msg=True for more details"
                 + self.path
             )
-        if pipe:
+        try:
             pipe.close()
+        except:
+            pass
         if not os.path.exists(tmpSol):
             raise PulpSolverError("Pulp: Error while executing " + self.path)
         (

pulp/apis/copt_api.py

@@ -5,10 +5,15 @@
 import warnings
 
 from uuid import uuid4
-from .core import sparse, ctypesArrayFill, PulpSolverError
-from .core import clock, log
-
-from .core import LpSolver, LpSolver_CMD
+from .core import (
+    sparse,
+    ctypesArrayFill,
+    PulpSolverError,
+    LpSolver,
+    LpSolver_CMD,
+    clock,
+    operating_system,
+)
 from ..constants import (
     LpStatusNotSolved,
     LpStatusOptimal,
@@ -894,7 +899,6 @@ def __init__(
                 logPath=logPath,
                 warmStart=warmStart,
             )
-
             self.coptenv = coptpy.Envr()
             self.coptmdl = self.coptenv.createModel()
 

pulp/apis/gurobi_api.py

@@ -440,7 +440,8 @@ def available(self):
             # normal execution
             return True
         # error: we display the gurobi message
-        warnings.warn(f"GUROBI error: {out}.")
+        if self.msg:
+            warnings.warn(f"GUROBI error: {out}.")
         return False
 
     def actualSolve(self, lp):

pulp/apis/highs_api.py

@@ -32,7 +32,7 @@
 from typing import List
 
 from .core import LpSolver, LpSolver_CMD, subprocess, PulpSolverError
-import os, sys
+import os
 from .. import constants
 
 
@@ -149,14 +149,19 @@ def actualSolve(self, lp):
 
         with open(tmpOptions, "w") as options_file:
             options_file.write("\n".join(file_options))
-        process = subprocess.run(command, stdout=sys.stdout, stderr=sys.stderr)
+        # print(command)
+        process = subprocess.Popen(command, stdout=None, stderr=None)
 
         # HiGHS return code semantics (see: https://github.com/ERGO-Code/HiGHS/issues/527#issuecomment-946575028)
         # - -1: error
         # -  0: success
         # -  1: warning
-        if process.returncode == -1:
-            raise PulpSolverError("Error while executing HiGHS")
+        # process = subprocess.run(command, stdout=sys.stdout, stderr=sys.stderr)
+        if process.wait() == -1:
+            raise PulpSolverError(
+                "Pulp: Error while executing HiGHS, use msg=True for more details"
+                + self.path
+            )
 
         with open(highs_log_file, "r") as log_file:
             lines = log_file.readlines()

pulp/pulp.py

@@ -104,12 +104,7 @@
 from . import constants as const
 from . import mps_lp as mpslp
 
-try:
-    from collections.abc import Iterable
-except ImportError:
-    # python 2.7 compatible
-    from collections.abc import Iterable
-
+from collections.abc import Iterable
 import logging
 
 log = logging.getLogger(__name__)

pulp/tests/run_tests.py

@@ -4,6 +4,10 @@
 
 
 def pulpTestAll(test_docs=False):
+    all_solvers = pulp.listSolvers(onlyAvailable=False)
+    available = pulp.listSolvers(onlyAvailable=True)
+    print(f"Available solvers: {available}")
+    print(f"Unavailable solvers: {set(all_solvers) - set(available)}")
     runner = unittest.TextTestRunner()
     suite_all = get_test_suite(test_docs)
     # we run all tests at the same time