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Fix error when xpress is imported before xpress_direct #3410

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merged 1 commit into from
Nov 8, 2024
Merged

Fix error when xpress is imported before xpress_direct #3410

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33 changes: 18 additions & 15 deletions pyomo/solvers/plugins/solvers/xpress_direct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -197,21 +197,6 @@ def __call__(self):
return xpress


_xpress_importer = _xpress_importer_class()
xpress, xpress_available = attempt_import(
'xpress',
error_message=_xpress_importer,
# Other forms of exceptions can be thrown by the xpress python
# import. For example, an xpress.InterfaceError exception is thrown
# if the Xpress license is not valid. Unfortunately, you can't
# import without a license, which means we can't test for that
# explicit exception!
catch_exceptions=(Exception,),
importer=_xpress_importer,
callback=_finalize_xpress_import,
)


@SolverFactory.register('xpress_direct', doc='Direct python interface to XPRESS')
class XpressDirect(DirectSolver):
_name = None
Expand Down Expand Up @@ -1222,3 +1207,21 @@ def load_slacks(self, cons_to_load=None):

"""
self._load_slacks(cons_to_load)


# Note: because _finalize_xpress_import references XpressDirect, we need
# to make sure to not attempt the xpress import until after the
# XpressDirect class is fully declared.
_xpress_importer = _xpress_importer_class()
xpress, xpress_available = attempt_import(
'xpress',
error_message=_xpress_importer,
# Other forms of exceptions can be thrown by the xpress python
# import. For example, an xpress.InterfaceError exception is thrown
# if the Xpress license is not valid. Unfortunately, you can't
# import without a license, which means we can't test for that
# explicit exception!
catch_exceptions=(Exception,),
importer=_xpress_importer,
callback=_finalize_xpress_import,
)
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