Originally posted by: SystemAdmin

Hi everybody,

I will really appreciate you to help me in advances. I write an algorithm with python. In each iteration of my algorithm, CPLEX solver is used to solve the model. But, some times the problem is not feasible and CPLEX get the "No solution exists CPLEX.CpxException: CPLEX Error 1217". So, this solution should be ignored and the heuristic continuing. However, at this stage the CPLEX is finished! How can I return the value of this error that is 1217 in the solution. I tried to use the CPLEX.CpxException that didn't work for me.

I want a command such as:
if CPLEX error != 1217 :
do the following commands
in the IBM site mention to the following commands that doesn't for me!

except CplexSolverError as exc:

if exc.args[2] == cplex.exceptions.error_codes.CPXERR_NO_SOLN:
...

Could you please guide me how to return the code of this error in the solution?

Regards
Alan Kurd
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Hello Alan,

The code that you wrote should be the correct way to handle a specific error from the CPLEX callable library through the Python API. One possibility is that you might not have imported CplexSolverError into your current scope. Do you have the line

from cplex.exceptions import CplexSolverError

at the top of your script?

If this doesn't resolve your issue, can you tell me what happens when you try the following in your code?

except cplex.exceptions.CplexSolverError as exc:
    print exc
    print exc.args

Philip Starhill
CPLEX Research Engineer
#CPLEXOptimizers
#DecisionOptimization