Add SAS API interface (#729)

* Add SAS API interface

* Update the version

* Remove unused comments

* Add an empty line to the end of the file

* Update SAS API interface

* Update documentation

* Update SAS API

* Update SAS API interface (need more changes)

* Various improvements to the SAS interfaces

* allow SAS solver classes without valid connection

* disable printing and fix comment

---------

Co-authored-by: Franco Peschiera <pchtsp@gmail.com>
Co-authored-by: phchri <Philipp.Christophel@sas.com>
Co-authored-by: Philipp Christophel <70648198+phchri@users.noreply.github.com>

.github/workflows/pythonpackage.yml

@@ -60,5 +60,11 @@ jobs:
       - name: Install coptpy
         run: |
           pip install coptpy
+      - name: Install saspy
+        run: |
+          pip install saspy
+      - name: Install swat
+        run: |
+          pip install swat
       - name: Test with pulptest
         run: pulptest

pulp/apis/__init__.py

@@ -9,6 +9,7 @@
 from .xpress_api import *
 from .highs_api import *
 from .copt_api import *
+from .sas_api import *
 from .core import *
 
 _all_solvers = [
@@ -35,6 +36,8 @@
     COPT,
     COPT_DLL,
     COPT_CMD,
+    SAS94,
+    SASCAS,
 ]
 
 import json