Gurobi doesn't work

Answered

Vanja Zomer

November 16, 2020 14:57

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Hi,

I tried to get access to Gurobi for python. I already have installed the license and the package. However, when importing Gurobi in my python script by:

import gurobipy as gp
from gurobipy import GRB

I get the following error message:

import gurobipy as gp
Traceback (most recent call last):

File "<ipython-input-2-e445dff78528>", line 1, in <module>
import gurobipy as gp

File "C:\Users\Vanja\anaconda3\lib\site-packages\gurobipy\__init__.py", line 3, in <module>
os.add_dll_directory(os.path.join(os.getenv('GUROBI_HOME'),'bin'))

File "C:\Users\Vanja\anaconda3\lib\ntpath.py", line 78, in join
path = os.fspath(path)

TypeError: expected str, bytes or os.PathLike object, not NoneType

Can anybody help me out?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 03:04 Edited

  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

  November 16, 2020 16:10

  Hi,

  The same issue is discussed in the community post Failed to import gurobipy.

  Best regards,
  Jaromił

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  Vanja Zomer

  November 16, 2020 19:50

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  Hi Jaromil,

  Thank you for your response! I see that Chien has exactly the same question :) You answered that GUROBI_HOME has no value, which I understand. However, I still don't have a clue how to solve that...

  Can you help me out?

  Kind regards,

  Vanja

   

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  Jaromił Najman

  • Gurobi Staff

  November 16, 2020 20:08

  Hi Vanja,

  Let us please continue in the community post linked above to avoid duplicates.

  Best regards,
  Jaromił

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