Setup.py script is not working, Windows 10, Python 3.7.4, Gurobi 8.1.1

Answered

Matt Hall

• October 05, 2019 20:54
• Edited

Edit: I worked around this by installing anaconda's python 3.7. Not sure why this worked, but it did!

So I've been struggling with this a few hours. I have used Gurobi on Linux/Mac before-- but I just got a desktop running Windows and was excited to break it in with some ILPs.

I installed Python 3.7.4, and then installed Gurobi 8.1.1 and activated my license key.

I primarily use the Python interface, so I went ahead and ran the setup.py install script. The output indicates that it worked.

C:\gurobi811\win64>python setup.py install
running install
running build
running build_py
creating build
creating build\lib
creating build\lib\gurobipy
copying python37\lib\gurobipy\__init__.py -> build\lib\gurobipy
copying python37\lib\gurobipy\gurobipy.pyd -> build\lib\gurobipy
running install_lib
running install_egg_info
Removing C:\Users\12096\AppData\Local\Programs\Python\Python37-32\Lib\site-packages\gurobipy-8.1.1-py3.7.egg-info
Writing C:\Users\12096\AppData\Local\Programs\Python\Python37-32\Lib\site-packages\gurobipy-8.1.1-py3.7.egg-info
removing C:\gurobi811\win64\build

However, when I run Python and attempt to import gurobipy, I get an error.

C:\gurobi811\win64>python
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 19:29:22) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import gurobipy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Users\12096\AppData\Local\Programs\Python\Python37-32\lib\site-packages\gurobipy\__init__.py", line 1, in <module>
from .gurobipy import *
ImportError: DLL load failed: %1 is not a valid Win32 application.

Please help. I've looked at similar issues reported. Generally, it seems like if I get this Import Error, then I didn't run the setup.py install script, but I did run the script and I'm still getting the error.

Thank you!!!

0

• 

  Matt Hall

  • October 05, 2019 20:12

  

  

  

  I have also tried running the setup script,

  C:\gurobi811\win64\bin\pysetup

  by passing in my python path, but this didn't resolve my issue either.

  Python installation directory (hit ENTER to use c:\Python27): C:\Users\12096\AppData\Local\Programs\Python\Python37-32
  
  running install
  running build
  running build_py
  creating build
  creating build\lib
  creating build\lib\gurobipy
  copying python37\lib\gurobipy\__init__.py -> build\lib\gurobipy
  copying python37\lib\gurobipy\gurobipy.pyd -> build\lib\gurobipy
  running install_lib
  running install_egg_info
  Removing C:\Users\12096\AppData\Local\Programs\Python\Python37-32\Lib\site-packages\gurobipy-8.1.1-py3.7.egg-info
  Writing C:\Users\12096\AppData\Local\Programs\Python\Python37-32\Lib\site-packages\gurobipy-8.1.1-py3.7.egg-info
  removing C:\gurobi811\win64\build
  
  [Hit ENTER to exit]

  Again, when I run my python shell, I fail to import gurobipy.

  Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 19:29:22) [MSC v.1916 32 bit (Intel)] on win32
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from gurobipy import *
  Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\12096\AppData\Local\Programs\Python\Python37-32\lib\site-packages\gurobipy\__init__.py", line 1, in <module>
  from .gurobipy import *
  ImportError: DLL load failed: %1 is not a valid Win32 application.

  0
• 

  Gwyneth Butera

  Gurobi Staff

  • October 07, 2019 13:56

  Hi Matt - It looks like your default Python is a 32-bit version:

  C:\Users\12096\AppData\Local\Programs\Python\Python37-32\lib

  Gurobi 8.x works only with 64-bit Python installations. Can you try using a different Python?

  Thanks.

  0
• 

  Matt Hall

  • October 07, 2019 14:59

  

  

  

  Thanks Gwyneth!

  0

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