Error in Reading Model: Python Jupyter

回答済み

Syed Saad Ali

2021年06月21日 02:02

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Hi,

I am unable to read a model file with "afiro.mps" following example 1 of the Python I Webinar even though this .mps file is already in the data folder. Below is the complete error message. could you please help me out?

Unable to open file 'afiro.mps' for input

---------------------------------------------------------------------------
GurobiError                               Traceback (most recent call last)
<ipython-input-15-56eb22f5bc96> in <module>
----> 1 model = read("afiro.mps")

src\gurobipy\gurobi.pxi in gurobipy.read()

src\gurobipy\gurobi.pxi in gurobipy.gurobi.read()

GurobiError: Unable to read model

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:52 編集済み

  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?.
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  Jaromił Najman

  • Gurobi Staff

  2021年06月21日 07:51

  Hi,

  Could you please provide more information? In particular, could you show the code you are using to read the \(\texttt{afiro}\) model? Are you sure that you are in the correct folder? Could you try to provide the full path to the \(\texttt{afiro}\) model? On a Mac, this would be

  /Library/gurobi912/mac64/examples/data/afiro.mps

  Best regards,
  Jaromił

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  Syed Saad Ali

  2021年06月21日 08:38

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  I have entered this code to read the file, but its not working

  model = read("C:\gurobi912\win64\examples\data\afiro.mps")

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  Jaromił Najman

  • Gurobi Staff

  2021年06月21日 09:14

  Could you please post your whole code snippet? Can you please double check that the path is correct and the file \(\texttt{afiro.mps}\) is indeed in the desired location?

  From the command line, can you execute

  gurobi_cl C:\gurobi912\win64\examples\data\afiro.mps

  Are you using the \(\texttt{gurobi.bat}\) shell?

  Are you able to execute the following Python code?

  import gurobipy as gp
  
  model = gp.Model("test")

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  Syed Saad Ali

  2021年06月21日 17:29

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  Syed Saad Ali

  2021年06月21日 17:31

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  and yes, I am also able to execute the code from the command line as you asked in the above comment 

  gurobi_cl C:\gurobi912\win64\examples\data\afiro.mps

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  Jaromił Najman

  • Gurobi Staff

  2021年06月22日 07:27 編集済み

  \(\texttt{\a}\) is the escape sequence for the ASCII bell. In your code you should use \(\texttt{\\\\}\) instead of \(\texttt{\\}\) when specifying paths.

  model = read("C:\\gurobi912\\win64\\examples\\data\\afiro.mps")

  Best regards,
  Jaromił

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  Syed Saad Ali

  2021年06月21日 21:29

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  Yeah, that was the problem. Now it works. 

  Thanks a lot for your quick responses, Jaromil :)

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