Gurobi status code

Answered

Grégoire Boussac

• June 27, 2019 09:52
• Edited

Hi everyone,

I would like to know if there is a proper way to convert the integer status codes into strings ?
I'm using a handmade dictionary (in Python), but would like to know if there is a pre-built feature to do this.

Thank you!

1

• Official comment

  

  Kostja Siefen

  Gurobi Staff

  • June 28, 2019 08:54

  The full list of status codes is documented at https://www.gurobi.com/documentation/current/refman/optimization_status_codes.html. There is nothing wrong with writing your own dictionary to convert the code values to strings. The status codes are normally hardcoded during compilation and the values (e.g, OPTIMAL=2) will not be changed in the future. However, we have occasionally extended the list in the past with additional values for new major releases.

  The Gurobi Python API provides class constants that can also be used (GRB.OPTIMAL, etc.) so your dictionary definition could look like this:

  status = { "LOADED" : GRB.LOADED, "OPTIMAL" : GRB.OPTIMAL, .... }
• Official comment

  

  Simranjit Kaur

  Gurobi Staff

  • December 06, 2024 00:55

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
• 

  Irvin Lustig

  • July 23, 2020 21:20
  • Edited

  

  

  You can hack this using the Python

  __dict__

  method:

  sc = gurobipy.StatusConstClass
  d = {sc.__dict__[k]: k for k in sc.__dict__.keys() if k[0] >= 'A' and k[0] <= 'Z'}

  Then the dictionary `d` is now:

  {1: 'LOADED',
   2: 'OPTIMAL',
   3: 'INFEASIBLE',
   4: 'INF_OR_UNBD',
   5: 'UNBOUNDED',
   6: 'CUTOFF',
   7: 'ITERATION_LIMIT',
   8: 'NODE_LIMIT',
   9: 'TIME_LIMIT',
   10: 'SOLUTION_LIMIT',
   11: 'INTERRUPTED',
   12: 'NUMERIC',
   13: 'SUBOPTIMAL',
   14: 'INPROGRESS',
   15: 'USER_OBJ_LIMIT'}

  2
• 

  Francis Viallet

  • November 29, 2024 20:50

  

  

  Hi,

  Seems that we're getting an attibute error in the latest version:

  module 'gurobipy' has no attibute 'StatusConstClass'

  Importing the class directly fixed it.

  from gurobipy._statusconst import StatusConstClass
  
  status_dict = {value: name for name, value in StatusConstClass.__dict__.items() if not name.startswith('__') and not callable(value)}
  status_dict.get(code, "UNKNOWN STATUS CODE")

   

  0
• 

  Maliheh Aramon

  Gurobi Staff

  • November 29, 2024 21:10

  Hi, 

  The gurobipy module was restructured a bit for version 12.0. This should do the trick in version 12.0:

  from gurobipy import GRB
  d = {getattr(GRB.Status, k): k for k in GRB.Status.__dir__() if "A" <= k[0] <= "Z"}
  

  Best regards,

  Maliheh

  1
• 

  Francis Viallet

  • December 02, 2024 14:08

  

  

  Hi, thanks, working well :)

  0

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