Install SCIP for Python on Windows does not work anymore

Question

I had a working SCIP installation on Python using the following thread: SCIP Python Installation Issue Windows with pip

Now I have a new laptop and tried to re-install SCIP again but it does not work (I tried on several machines with the identical result). The software versions have changed so I refer to the new versions below.

Installation (Environment):

OS: Windows 10
Anaconda Version 5.0.1| Release Date: October 25, 2017; Python 3.6 (64 bit)
PyCharm, 2017.3 (Community Edition)
Library PySCIPOpt (pip install pyscipopt)
Unpacked the files from SCIPOPTDIR.rar in directory C:\SCIPOPT
Set the environment variables:
- Added the Variable SCIPOPTDIR with the Value of the installation directory (i.e. C:\SCIPOPT)
- Added in the PATH Variable the entry %SCIPOPTDIR%\lib

Error Message:

File "C:/Users/i070009/PycharmProjects/OptimizationModels/RunTestOfSCIPLibrary.py", line 1, in

from pyscipopt import Model, quicksum

ModuleNotFoundError: No module named 'pyscipopt'

If I use a jupyter Notebook (from pyscipopt import Model, quicksum) I get the following error message:

ImportError Traceback (most recent call last) in () ----> 1 from pyscipopt import Model, quicksum

C:\ProgramData\Anaconda3\lib\site-packages\pyscipopt__init__.py in () 1 # export user-relevant objects:

  2 from pyscipopt.Multidict import multidict

----> 3 from pyscipopt.scip import Model

  4 from pyscipopt.scip      import Branchrule

  5 from pyscipopt.scip      import Conshdlr

ImportError: DLL load failed: The specified module could not be found.

My guess is that the module is not found but since I added the PATH variables (and it worked on my old laptop) I’m puzzled why it does not work. It might be a really simple problem. I’m just not seeing it! Thanks for any help on this topic!

Did the command pip install pyscipopt even work correctly? I suppose not, if you ran it before setting up the SCIP Opt Suite installation. — mattmilten
– mattmilten, Commented Dec 12, 2017 at 14:09
Hi Mattmilten Thanks for your answer. Yes, the installation went without any error messages. Actually it worked in this order on the old computer as well. This is why I did not change anything. Would you recommend to first unpick the SCIPOPT and set the env variables before I use "pip install pyscipopt"? — stahldonnerklinge
– stahldonnerklinge, Commented Dec 18, 2017 at 9:27

mattmilten · Accepted Answer · 2017-12-22 11:43:11Z

2

This is already handled here: https://github.com/SCIP-Interfaces/PySCIPOpt/issues/110

One needs to make sure that the bin directory is available in the PATH on Windows so both the binary as well as the dll/lib are found during installation and execution of PySCIPOpt.

answered Dec 22, 2017 at 11:43

mattmilten

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