Merge pull request #2125 from bknueven/xpress_warning

Issue warning when using the Xpress LP/MPS interface
Pyomo · Sep 28, 2021 · 6f79c07 · 6f79c07
2 parents c0b92cb + b66daec
commit 6f79c07
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diff --git a/pyomo/environ/tests/standalone_minimal_pyomo_driver.py b/pyomo/environ/tests/standalone_minimal_pyomo_driver.py
@@ -98,6 +98,9 @@ def run_writer_test():
 def run_solverfactory_test():
     skip_solvers = {
         'py',
+        'xpress',
+        '_xpress_shell',
+        '_mock_xpress',
     }
 
     with LoggingIntercept() as LOG, capture_output(capture_fd=True) as OUT:

diff --git a/pyomo/solvers/plugins/solvers/XPRESS.py b/pyomo/solvers/plugins/solvers/XPRESS.py
@@ -75,6 +75,12 @@ class XPRESS_shell(ILMLicensedSystemCallSolver):
     """
 
     def __init__(self, **kwds):
+        logger.warning(
+                "The shell interface for Xpress is broken for recent versions "\
+                "of Xpress. Please use xpress_direct or xpress_persistent, "\
+                "which require the Xpress Python API. Python bindings "\
+                "for recent versions of Xpress can be installed via `pip`: "\
+                "<https://pypi.org/project/xpress/>.")
         #
         # Call base class constructor
         #