Develop Reference

Install SCIP solver on Python3.5 Numberjack (OSX)

I am learning Constraint Programming in Python and, for the solving of the problems, I am supposed to use the SCIP solver. I have installed the Numberjack standard package from Github witch includes Mistral, Mistral2, Toulbar2, MipWrapper, SatWrapper, MiniSat and Walksat solvers.
Running my code I got the following error:
Traceback (most recent call last):
File "/Users/angelocoelho/anaconda3/lib/python3.5/site-packages/Numberjack/__init__.py", line 910, in load
lib = __import__(solverstring, fromlist=[solverspkg])
ImportError: No module named 'Numberjack.solvers.SCIP'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "grafosdefluxos.py", line 42, in <module>
solver = model.load('SCIP')
File "/Users/angelocoelho/anaconda3/lib/python3.5/site-packages/Numberjack/__init__.py", line 915, in load
solvername)
ImportError: ERROR: Failed during import, wrong module name? (SCIP)
I already ran make in 'scipoptsuite-3.1.0' and in 'scip-3.2.1', installed Numberjack-master's 'setup.py' and tried this:
python setup.py -solver SCIP
witch returned the error
Error: the solver 'SCIP' is not known, please use one of: Mistral, SatWrapper, Toulbar2, Walksat, MipWrapper, MiniSat, Mistral2
I have the SCIP folders alongside and inside the Numberjack folders.
I read and ran all the commands in the README and INSTALL files on how I could get this solver configured but I couldn't get it right.
How can I get SCIP available to solve the problems in Numberjack?

After talking to the assistant teacher I got the answer for this problem.
The folder where Numberjack/SCIP was being installed was not the one it was supposed to be, therefore it was not really included in the solver list. After completing the python setup.py build and python setup.py install installation I ran python setup.py build -solver SCIP and the terminal feedback stated
Successfully built solver interfaces for MipWrapper, SCIP
But the jupyter notebook didn't recognize the solver.
What solution should work having Anaconda (python3.5) already installed:
Download Numberjack (file "Numberjack-master.zip") and unpack it.
Download SCIP and copy the downloaded file, scipoptsuite-3.1.0.tgz. Paste it inside Numberjack-master unpacked directory. The path of it should be ~/Downloads/Numberjack-master/scipoptsuite-3.1.0.tgz.
In terminal run cd ~/Downloads/Numberjack-master (or your Numberjack-master directory path).
Then run python3.5 setup.py install --user.
In my case Jupyter was looking for the solvers in
~/anaconda3/lib/python3.5/site-packages/Numberjack/ and they were
not being installed there so, instead of using python, I used python3.5 since my Anaconda was the Python 3.5 package.

Why is there a scip-3.2.1 directory? The SCIP Opt Suite 3.1.0 contains SCIP 3.1.0. You need to make sure to run all setup and make commands exactly as stated on the Numberjack install page.

How to alter setup.py for CyIPOPT

I want to install the python package CyIpopt (https://github.com/matthias-k/cyipopt) on windows 10 and python version 3.5.2. For the binary I am using http://www.coin-or.org/Binaries/Ipopt/Ipopt-3.10.1-Win32-Win64-dll.7z (which I unpacked). The github page gives install instructions. At one point it says:
Download the source files of cyipopt and update setup.py to point to the header files and binaries of the Ipopt package, if LD_LIBRARY_PATH and pkg_config are not setup to find ipopt on their own.
I downloaded the source files from github and edited the setup.py file by altering lines 33-36 to :
IPOPT_ICLUDE_DIRS=['D:\...\Ipopt-3.10.1-Win32-Win64-dll\include\coin', np.get_include()]
IPOPT_LIBS=['IpOptFSS','IpOpt-vc10','IpOpt-vc8']
IPOPT_LIB_DIRS=['D:\...\Ipopt-3.10.1-Win32-Win64-dll\lib\\x64\Release MKL']
IPOPT_DLL=['IpOptFSS.dll','IpOpt-vc10.dll','IpOpt-vc8.dll']
The dots represent the path to these folders on my computer. Now when I run python setup.py install, it run succesfuly. However when I then run python and import ipopt I get the following error:
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\Linthorst\Miniconda3\lib\site-packages\ipopt-0.1.6-py3.5-win-amd64.egg\ipopt__init__.py", line 40, in
from cyipopt import *
ImportError: No module named 'cyipopt'
I suspect I altered the setup.py file incorrectly (since I made an educated guess). I am confused that it installed but doesn't work. Can anybody help me solve this error? Many thanks in advance

Error installing pyflycapture2 on Windows

I am attempting to install this https://github.com/jordens/pyflycapture2 python binding on my Windows machine. The readme only has instructions on how to do it for Linux systems, but I imagine the library should still work.
I am able to run "python setup.py install" and it seems to successfully complete, but when I try to run "python test_flycapture2.py" I get this error:
C:\Users\clinic\Desktop\pyflycapture2>python test_flycapture2.py Traceback (most recent call last):
File "test_flycapture2.py", line 20, in <module>
import flycapture2 as fc2
File "build\bdist.win-amd64\egg\flycapture2.py", line 7, in <module>
File "build\bdist.win-amd64\egg\flycapture2.py", line 6, in __bootstrap__
ImportError: DLL load failed: The specified module could not be found.
This seems to imply that flycapture2 wasn't installed correctly. When I instead just open a python session and do "import flycapture2" I get the following error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "build\bdist.win-amd64\egg\flycapture2.py", line 7, in <module>
File "build\bdist.win-amd64\egg\flycapture2.py", line 6, in __bootstrap__
ImportError: DLL load failed: The specified module could not be found.
Have I done something wrong with the installation process or does pyflycapture2 just not work with Windows?

A dumb solution that's worth a try. There are chances that the DLL are searched directly from where you're starting the python script. So if you have the dll somewhere on your computer, copy it along where you have your test_flycapture2.py.
But given the fact that the setup.py file has a whole bunch of absolute paths in there, I would not place my hopes too high. You can also try to install FlyCapture 2 at the exact same path, run python setup.py bdist_wheel (you will need to install wheel first with pip) in the pyflycapture2 folder, and see if that succeeds.
If it does, try installing the generated wheel (that will be in dist/ subfolder) by doing pip install dist/pyfly....wheel and test again.
Hope this helps

I'm answering this mostly because I found another post where the same question had been posted but the original problem was never answered.
How do I run an installed Python module on Windows?
In the comments, the original poster says that it suddenly started working. I found that the solution was simply to restart my computer. I have now attempted this on two computers and this worked for both of them.

Unable to import git in python

I am facing these issues. Can you help me with the same ?
Why am I seeing this error ? Do I have to add anything in the requirements.txt file ?
>>> import git
Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
import git
File "git\__init__.py", line 29, in <module>
_init_externals()
File "git\__init__.py", line 23, in _init_externals
raise ImportError("'gitdb' could not be found in your PYTHONPATH")
ImportError: 'gitdb' could not be found in your PYTHONPATH
>>> from git import Repo
Traceback (most recent call last):
File "<pyshell#8>", line 1, in <module>
from git import Repo
File "git\__init__.py", line 29, in <module>
_init_externals()
File "git\__init__.py", line 23, in _init_externals
raise ImportError("'gitdb' could not be found in your PYTHONPATH")
ImportError: 'gitdb' could not be found in your PYTHONPATH

I already had gitdb and smmap installed so I had to reinstall them.
You can reinstall them by running the following command in your terminal:
pip3 install --upgrade --force-reinstall gitdb; pip3 install --upgrade --force-reinstall smmap

I also got the message ImportError: 'gitdb' could not be found in your PYTHONPATH (when trying to use GitPython).BUT I had gitdb already installed!
Thanks to this hint I figured out that gitdb silently failed because it was missing smmap.
So I installed this and it worked.

You need to install gitdb package.
$ sudo easy_install gitdb

I had the same problem. However, gitdb and smmap were already installed by pip. As I used brew to install python and its dependencies on my mac, when I checked brew doctor command, it said that my /usr/local/sbin directory is not in my PATH. So I added it to my PATH (though it didn't have anything to do with the python) and everything worked out eventually.

MS Windows Versions of this problem can occur because of the order of Python versions in your system PATH, as it did for me. I did not realize that when I installed another program, it installed a newer version of Python for its own usage, and it appended my system PATH with the address to the newer version. I noticed it when I looked at the PATH variable and found two versions of Python being called. Windows uses the first it finds, and if the first doesn't match what your program expects, it gets confused and can't find the right path to the module. This is what I did to resolve it:
To check: an easy way to test if this is your problem is to see if the paths separated by semicolons are in the right order. That can be seen in the System Variables of Windows or by printing your PATH variable in your CMD shell like in this example:
C:> path
PATH=C:\Program Files (x86)\Python37-32\Scripts;C:\Program Files (x86)\Python37-32;C:\Program Files\Python38\Scripts;C:\WINDOWS
Temporary solution:
To see if it is going to fix your computer, change it in your CMD window. Your variable change will be discarded when the window is closed. One way to do this test is to copy the paths, move the Python references to the order they are needed, and write it back:
C:> set path = C:\WINDOWS;C:\Program Files (x86)\Python37-32;C:\Program Files\Python38\Scripts;C:\Program Files (x86)\Python37-32\Scripts\
Then run the Python program to see if this was your problem. Note that this is only an example; do not copy & paste it. Your path is customized for the programs on your computer.
Permanent solution: If the above test resolves your problem, you must change your System Variables to make the change permanent. For me that usually requires a reboot afterwards in order to make the variables appear in all new windows.

Difficulties installing SOAPpy module

I am very new to python and have been figuring out how to install modules.I have been trying to install the SOAPpy module and have only had success with the required modules fpconst, wstools, and setuptools(not mentioned as required, but still ended up being required).
I am getting an error when I try and install the SOAPpy module.
Traceback <most recent call last>:
File "...\setup.py", line 43, in module <module>
__version__ = load_version()
File "...\setup.py", line 35 in load_version
execfile(filename, d.__dict__)
IOError: [Errno 2] Unable to load the version number (no such file or directory):
'...\\src\\SOAPpy\\version.py'
Not sure what i should do to fix this.
Any help is greatly appreciated!

Looking at SOAPpy's setup.py file, it tries to import SOAPpy.version. This doesn't work if you're calling it from somewhere else. Try running it directly in the SOAPpy directory because Python adds your current working directory to sys.path. For example:
cd C:\Users\eclaird\Download\SOAPpy\ # The folder with setup.py
python.exe setup.py install

Thanks for the help.
I eventually found what the issue was. I had to get some other required modules for the install to work, also the tar file I got was missing directories, so I found the completed version on Github.