1.4.7

* fix: except AttributeError when setting tolerance on cloned Configuration
Enable cloning models between solver interfaces that do not support the same set of tolerance parameters.

src/optlang/cplex_interface.py

@@ -403,7 +403,10 @@ def __init__(self, lp_method='primal', presolve="auto", verbosity=0, timeout=Non
         self.qp_method = qp_method
         if "tolerances" in kwargs:
             for key, val in six.iteritems(kwargs["tolerances"]):
-                setattr(self.tolerances, key, val)
+                try:
+                    setattr(self.tolerances, key, val)
+                except AttributeError:
+                    pass
 
     @property
     def lp_method(self):

src/optlang/glpk_interface.py

@@ -391,7 +391,10 @@ def __init__(self, presolve="auto", verbosity=0, timeout=None, *args, **kwargs):
         self.timeout = timeout
         if "tolerances" in kwargs:
             for key, val in six.iteritems(kwargs["tolerances"]):
-                setattr(self.tolerances, key, val)
+                try:
+                    setattr(self.tolerances, key, val)
+                except AttributeError:
+                    pass
 
     def __getstate__(self):
         return {'presolve': self.presolve,

src/optlang/gurobi_interface.py

@@ -407,6 +407,12 @@ def __init__(self, lp_method='primal', qp_method='primal', presolve=False,
         self.qp_method = qp_method
         self.presolve = presolve
         self.timeout = timeout
+        if "tolerances" in kwargs:
+            for key, val in six.iteritems(kwargs["tolerances"]):
+                try:
+                    setattr(self.tolerances, key, val)
+                except AttributeError:
+                    pass
 
     @property
     def lp_method(self):

src/optlang/tests/test_change_solver.py

@@ -74,7 +74,8 @@ def test_clone_to_cplex(self):
                 self.assertIs(constraint.__class__, cplex.Constraint)
 
         def test_clone_to_glpk(self):
-            glpk_model = glpk.Model.clone(self.model)
+            cplex_model = cplex.Model.clone(self.model)
+            glpk_model = glpk.Model.clone(cplex_model)
             self.assertEqual(glpk_model.__class__, glpk.Model)
             for variable in glpk_model.variables.values():
                 self.assertIs(variable.__class__, glpk.Variable)