Error when loading python module (noob)

[Jose Antonio Medrano Garcia]

Hello, I downloaded the ortools module for python from pypi and I executed the file, everything was OK, no errors or warnings.  When I try the examples I get the following error:

>>> from ortools.linear_solver import pywraplp

Traceback (most recent call last):

  File "<pyshell#0>", line 1, in <module>

    from ortools.linear_solver import pywraplp

  File "C:\Python27\lib\site-packages\ortools\linear_solver\pywraplp.py", line 28, in <module>

    _pywraplp = swig_import_helper()

  File "C:\Python27\lib\site-packages\ortools\linear_solver\pywraplp.py", line 20, in swig_import_helper

    import _pywraplp

ImportError: No module named _pywraplp

Am I missing something?

[Laurent Perron]

is this a 32 bit python?  Did you download the 32 bit module?

Thanks

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[Jose Antonio Medrano Garcia]

I am using Python(x,y) on a Windows XP virtual machine within Virtualbox and yes, I downloaded the 32 bit module

[Laurent Perron]

can you check you have _pywraplp.pyd in C:\Python27\lib\site-packages\ortools\linear_solver\ ?

Thanks

[Jose Antonio Medrano Garcia]

There are 3 files with the name pywraplp but none of them has the .pyd extension, also none of them has the leading underscore in the name...

[Laurent Perron]

It should be an old archive.
Please try to download the python examples archives (3070) and run python setup.py install inside it.

Thanks

[Jose Antonio Medrano Garcia]

Thanks, but where do I download those files from?

[Laurent Perron]

https://drive.google.com/folderview?id=0B2yUSpEp04BNdEU4QW5US1hvTzg&usp=sharing

Thanks

[Jose Antonio Medrano Garcia]

Thanks, did that, got the following error:

[Jose Antonio Medrano Garcia]

I downloaded the .egg file from pypi, reinstalled in a different machine, not in the virtualbox virtual machine and still keep getting the same error, is there a problem with the installation module for python?

Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win32

Type "copyright", "credits" or "license()" for more information.

>>> from constraint_solver import pywrapcp

Traceback (most recent call last):

  File "<pyshell#0>", line 1, in <module>

    from constraint_solver import pywrapcp

ImportError: No module named constraint_solver

>>> 

>>> from ortools.constraint_solver import pywrapcp

Traceback (most recent call last):

  File "<pyshell#2>", line 1, in <module>

    from ortools.constraint_solver import pywrapcp

  File "C:\Python27\lib\site-packages\ortools-1.3107-py2.7-win32.egg\ortools\constraint_solver\pywrapcp.py", line 28, in <module>

    _pywrapcp = swig_import_helper()

  File "C:\Python27\lib\site-packages\ortools-1.3107-py2.7-win32.egg\ortools\constraint_solver\pywrapcp.py", line 24, in swig_import_helper

    _mod = imp.load_module('_pywrapcp', fp, pathname, description)

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

[Laurent Perron]

It works flawlessly on my machine.
I tried python setup.py install and python setup.py install --user. Both works fine.

Normally, it you run setup.py install inside the examples archive, it will pull the python binary egg module and install it.

Can you try this?

Thanks

[Jose Antonio Medrano Garcia]

I have tried all your suggestions, I have installed the module from the exe file, from the egg file, from the ortools_example file, I have done it in 3 different machines and I always get the same error message about the module not found. I even reinstalled it from easy_install, with 2 different python installations (enthought and pythonxy). On the other hand, I installed it in Ubuntu with easy_install and it worked perfectly, so I´m about to give up on the windows installation. Any other suggestions?

[Laurent Perron]

Hello, 

Can you make sure you have the C++ redistributable libraries for visual studio 2012 installed?

Maybe this is what makes the loading of modules fail.

--Laurent

[Jose Antonio Medrano Garcia]

I have the VS C++ redistributables installed for 2005, 2008 and 2010 but not 2012.

[Jose Antonio Medrano Garcia]

In one of the windows machines I do have the VS C++ redistributables for 2012 and still it does not work. I don't know what else to do,  I guess I will have to give up on windows and move to ubuntu.

[Laurent Perron]

Hi again, 

can you try adding -v -m to the python command line flags.

It should log the module loading process.

Thanks

[Jose Antonio Medrano Garcia]

thanks, how and where exactly do I do that?  

[Jose Antonio Medrano Garcia]

I have been reading through the posts and it is not an isolated issue, I found other people having the same problem.  There seems to be a bug in the setup.py file which we are supposed to change manually (change the dll for pyd and add other stuff) but I can´t seem to find the setup.py file to make those changes since I installed the module through easy_install or via the egg file.  I really want to give this thing a try for my OR classes and use it for discrete optimization but I have not been able to get it running.

[Laurent Perron]

No, 

I fixed the bug with pyd a while ago. And I tested these modules on my computer and they were fine.

Therefore it is harder to debug.

[Laurent Perron]

so please run c:\python27\python.exe -v -m <path to one example>

Can you try pyflow_example.py ? It has less dependencies than the pywraplp module.

Thanks

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[Jose Antonio Medrano Garcia]

OK, I did that but the output is very long and I don´t know how to copy it from the command window, and also when I scroll up the first part of the output is no longer available.   Here's what I typed at the command line

c:>python -v -m pyflow_example.py

(I am in the examples directory so I don't have to specify the path)

and attached is the last part of the output as an image, since I can't copy it

El jueves, 13 de febrero de 2014 16:49:06 UTC-6, Laurent Perron escribió:

so please run c:\python27\python.exe -v -m <path to one examp

[Laurent Perron]

Hello,

I have rebuilt the packages with different options.

The version number is now 3149.

Can you retry?

Thanks

[Jose Antonio Medrano Garcia]

thanks, sorry to tell you that I deleted all files in  the site-packages ortools folder, reinstalled the new package and still the problem persists...

[Laurent Perron]

Maybe it is the manual install.

Here is what I did:

download Google.OrTools.python.examples.3124.zip from https://drive.google.com/folderview?id=0B2yUSpEp04BNdEU4QW5US1hvTzg&usp=sharing#list

unzip it somewhere

go into directory ortools_examples and type:

  c:\python27\python.exe setup.py install

this pulls ortools 1369 along other dependencies. then type:

  c:\python27\python.exe examples\pyflow_example.py

and it works.

Can you try that?

Thanks

[Jose Antonio Medrano Garcia]

sorry man, no go, erased everything, did exactly as you suggested and still the same error...I appreciate all your help, but I have tried this in 2 different machines, one with xp and one with win7 with the same results...

[Fabien Valthier]

Hi,

I believe I have the same type of error.

I just installed or-tools and when I tried to run an example,

I get the following error:

>python.exe examples\golomb8.py

raceback (most recent call last):

 File "examples\golomb8.py", line 28, in <module>

   from ortools.constraint_solver import pywrapcp

 File "c:\python27\lib\site-packages\ortools-1.3750-py2.7-win32.egg\or

traint_solver\pywrapcp.py", line 27, in <module>

   _pywrapcp = swig_import_helper()

 File "c:\python27\lib\site-packages\ortools-1.3750-py2.7-win32.egg\or

traint_solver\pywrapcp.py", line 23, in swig_import_helper

   _mod = imp.load_module('_pywrapcp', fp, pathname, description)

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

However, the *.pyd is in the constraint_solver directory.

I tried several things but did not work. 

Anyone has an idea on the issue ?

(I am on Win7 x64 (but for some reasons ortools win32 was installed,

Python 2.7)

Thank you very much !

[Laurent Perron]

First part of the answer, the library that you are using is linked to the python version (32 or 64 bit)

I will install a module and try it.

--Laurent

For more options, visit https://groups.google.com/d/optout.

[Vivek Vikram Singh]

Hi,

I had the exact same problem with " pywrapcp ", but I played stupid myself. So felt kind of giving up. Then tried these steps mentioned here

https://developers.google.com/optimization/installing#source_windows

Windows7 ,64 bit, Python 2.7

1) installed Visual Studio 2012 ultimate

2) I already had JDK 1.7

3) Downloaded and installed CMake 2.8

Opened Command Prompt as given in this link : http://blog.meidianto.com/2010/06/24/where-the-heck-is-visual-studio-command-prompt/

4) Downloaded and installed " setuptools " ( did not install GLPK )

5) Downloaded and install " google-apputils " 

6 ) Downloaded and installed Or-tools from here : https://drive.google.com/folderview?id=0B2yUSpEp04BNdEU4QW5US1hvTzg&usp=sharing

Run example (tsp.py) in or-tools/example directory, it worked fine.

I suggest you to erase everything relared to this process and start once more. It might work. Worked for me after 14 hours continuos work.

[Shuo Li]

I had this problem on my new Win10 x86-64 machine as well

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

After exploring the _pywrapcp.pyd file using dependency walker, I found the VC++ packages are missing.

Install Visual C++ Redistributable Packages for Visual Studio 2013 and problem solved.

在 2015年4月17日星期五 UTC+2上午4:01:07，Vivek Vikram Singh写道：

[Lei Feng]

Installing Visuall C++ Redistributable Packages works for me too. Thanks for sharing!