Error with reading lp/mps model in python

Answered

Yasaman Khodadadegan

• February 07, 2022 20:45
• Edited

Hi,

I have the following codes that do not work. I want to read a model file that is in .lp or .mps format. 

import gurobipy as gp

model = read("C:\\gurobi810\\win64\\examples\\data\\afiro.mps")

I get the following error,

 

---------------------------------------------------------------------------

NameError

Traceback (most recent call last)

c:\Users\...\ReadModel.py in <module>

1 import gurobipy as gp

----> 2 model = read("C:\\gurobi810\\win64\\examples\\data\\afiro.mps") NameError: name 'read' is not defined

0

• 

  Yasaman Khodadadegan

  • February 07, 2022 21:00

  

  

  

  I can read the same file in Gurobi Interactive Shell and optimize it. I just don't know why I can't read it in VS code using python. thanks!

  0
• 

  Simon Bowly

  Gurobi Staff

  • February 08, 2022 01:34

  Hi Yasaman,

  In the interactive shell a different import command is run so that Gurobi's "read" command can be called directly. For normal python code, you'll need to give the "gp" package name for the "read" command, so you should change your python script to the following:

  import gurobipy as gp
  
  model = gp.read("C\\gurobi810\\win64\\examples\\data\\afiro.mps")

  Best regards,
  Simon

  0
• 

  Yasaman Khodadadegan

  • February 08, 2022 07:04

  

  

  

  Thanks for your response!

  I tried the following,

  import gurobipy as gp
  
  model = gp.read("C\\gurobi810\\win64\\examples\\data\\afiro.mps")

   

  I get the following error,

  ---------------------------------------------------------------------------

  GurobiError Traceback (most recent call last) c:\Users\A126289\OneDrive - PROGRESSIVE CORPORATION\Yasaman_folder_All Files\Optimization_Analysis\OMB\OMB Schedule Models\Python Code\ReadModel.py in <module>

  1 import gurobipy as gp

  ----> 2 model = gp.read("C\\gurobi810\\win64\\examples\\data\\afiro.mps") src\gurobipy\gurobi.pxi in gurobipy.read()

  src\gurobipy\gurobi.pxi in gurobipy.gurobi.read() src\gurobipy\gurobi.pxi in gurobipy.gurobi._getdefaultenv() src\gurobipy\env.pxi in gurobipy.Env.__init__() GurobiError: No compatible runtime available for version 9.1.2

  0

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