Error with reading lp/mps model in python

回答済み

Yasaman Khodadadegan

2022年02月07日 20:45 編集済み

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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

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  Yasaman Khodadadegan

  2022年02月07日 21:00

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  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!

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  Simon Bowly

  • Gurobi Staff

  2022年02月08日 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

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  Yasaman Khodadadegan

  2022年02月08日 07:04

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  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

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