Is it possible that the XPRESS c-libraries can be called directly from Python using ctypes?

Hello Michal: The interface example provided by Johannes earlier in this discussion thread does not seem to contain any definition of ‘XPRMfindident’ – would you be willing to share the extension of the code that you are working with?

Besides that, Release 8.6 of Xpress comes with Mosel 5 where we enforce the use of the ‘public’ marker on any entities that you wish to make visible to external programs when using standard compilation of the Mosel model (global, non-public entities will remain visible with debug compilation). I would assume that adding a ‘public’ marker (either onto the whole ‘declarations’ block or for individual entities) will correct the problem that you are reporting.