I'm working with PuLP 1.6 and had the FICO XPRESS solver installed already before installing PuLP.
When I run pulp.pulpTestAll() it doesn't show the XPRESS solver as unavailable but instead the test fails with the message:
The system cannot find the path specified.
pulp.constants.PulpError: Tests Failed
How can I configure a PuLP solver, specifically the path? The XPRESS bin folder is in my path currently.
Edit: I have found the pulp.cfg.winand tried enter my path in some different ways (e.g. XpressPath = C:\xpressmp\bin\optimizer.exe, but it didn't change the error.
I could not find a solution on how to get the XPRESS interface working in PuLP (I also posted an issue to GitHub, but we couldn't find a solution either (https://github.com/coin-or/pulp/issues/143)).
However, I realized that XPRESS itself offers a Python package within their newer versions. I was not aware of this in the beginning and ended up using the their package, which works just fine and is similar to PuLP. Maybe this can help someone.