Failed to "import gurobipy" even after running setup.py or pysetup.bat

A BC

• February 09, 2020 11:32
• Edited

After typing "import gurobipy", this would show up:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Users\1\AppData\Local\Programs\Python\Python38\lib\site-packages\gurobipy\__init__.py", line 1, in <module>
from .gurobipy import *
ImportError: DLL load failed while importing gurobipy: 找不到指定的模块。(EN:The specified module could not be found)

I've tried uninstalling and reinstalling python and gurobi, and made sure both are the 64 bits version.

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• 

  Matthias Miltenberger

  Gurobi Staff

  • February 10, 2020 08:57

  How did you install Gurobi? Could you please share the commands you used and the resulting output?

  Cheers,
  Matthias

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  A BC

  • February 10, 2020 11:21

  

  

  

  I first run the .msi file, keeping every setting as default. Then, from the installation path, I ran python setup.py install, which returns:

  running install
  running build
  running build_py
  creating build
  creating build\lib
  creating build\lib\gurobipy
  copying python38\lib\gurobipy\__init__.py -> build\lib\gurobipy
  copying python38\lib\gurobipy\gurobipy.pyd -> build\lib\gurobipy
  running install_lib
  byte-compiling C:\Users\1\AppData\Local\Programs\Python\Python38\Lib\site-packages\gurobipy\__init__.py to __init__.cpython-38.pyc
  running install_egg_info
  Removing C:\Users\1\AppData\Local\Programs\Python\Python38\Lib\site-packages\gurobipy-9.0.1-py3.8.egg-info
  Writing C:\Users\1\AppData\Local\Programs\Python\Python38\Lib\site-packages\gurobipy-9.0.1-py3.8.egg-info
  removing C:\gurobi901\win64\build

   

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  Matthias Miltenberger

  Gurobi Staff

  • February 10, 2020 14:59

  Could you please try using the Anaconda Python 3.8 distribution? This works fine with Gurobi. Apparently, there is some issue with the "official" Python 3.8 and Gurobi.

  Cheers,
  Matthias

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  A BC

  • February 11, 2020 03:36

  

  

  

  I downgraded python to 3.7.5 and it works too. Thanks.

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• 

  Sonali Suryawanshi

  • July 13, 2020 20:15

  

  

  I have installed gurobi 902 and python 3.8.3. 

  I had earlier used gurobi 811 and python 2.7.

   

  In both the above cases I uesd to get the DLL error.

   

  Solution:

  1. Open Anaconda promt as administrator

  2. go to gurobi/win directory, for example, cd gurobi902/win64

  3. type python setup.py install

   

  and you are free to use gurobi any where in your system.

   

  The only problem with this solution is you have to do it evrytime you start your system.

   

   

   

   

    

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