[ITK-users] ITK 4.6.0 Python Wrapping (swig?) problem

[Sami Koho]

Thank you Michka! The solution was in the ldconfig file creation:

> ITK will install by default in /usr/local/lib. Now, you have to tell the system that the files have been installed here.
> cd /etc/ld.so.conf.d/
> add a file called itk-46.conf, which should contain only one line: /usr/local/lib
> ldconfig # tells the system to read the files in ld.so.conf.d

On Ubuntu 14 the Python directory configuration is a bit different than in the Fedora guide:

> /Path to a program.
> PYTHON_EXECUTABLE:FILEPATH=/usr/bin/python
> 
> //Path to a file.
> PYTHON_INCLUDE_DIR:PATH=/usr/include/python2.7
> 
> //Path to a file.
> PYTHON_INCLUDE_DIR2:PATH=/usr/include/x86_64-linux-gnu/python2.7
> 
> //Path to a library.
> PYTHON_LIBRARY:FILEPATH=/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
> 
> //Path to a library.
> PYTHON_LIBRARY_DEBUG:FILEPATH=PYTHON_LIBRARY_DEBUG-NOTFOUND
> 
> //Directory where the arrayobject.h header file can be found. This
> // file is part of the numarray package
> PYTHON_NUMARRAY_INCLUDE_DIR:PATH=/usr/lib/python2.7/dist-packages/numpy/core/include/numpy
> 
> //Python site-packages directory to install a .pth file pointing
> // at WrapITK Python modules.
> PY_SITE_PACKAGES_PATH:PATH=/usr/lib/python2.7/dist-packages


Best,

Sami

On Sep 30, 2014, at 14:03, Michka Popoff <michkapopoff at gmail.com> wrote:

> Hi
> 
> once ITK is compiled, there is no more need for Swig at runtime.
> 
> For the syntax, you should use the new wrapping syntax.
> Look at how it is done in this example, at the end there is python code [1]
> 
> I would recommend you not to use system swig, this is mostly an option for people wanting to play around with external versions of swig.
> If you want to be sure it works, just set ITK_USE_SYSTEM_SWIG=OFF. ITK will download, compile and use an internal swig.
> You can find a detailed tutorial for the installation here : http://www.itk.org/Wiki/ITK/WrapITKInstallFedora
> 
> The tutorial should work for Ubuntu 14, I never tried but one user reported being able to install ITK wrappings with this tutorial.
> 
> [1] http://itk.org/ITKExamples/src/Filtering/AnisotropicSmoothing/ComputeCurvatureAnisotropicDiffusion/Documentation.html
> 
> Michka
> 
> On 30 sept. 2014, at 12:51, Sami Koho <sakoho at utu.fi> wrote:
> 
>> Hello,
>> 
>> this week I tried to upgrade my ITK installation on my Ubuntu 14.04 (64 bit) to the 4.6.0 release version, as it promised much improved Python wrapping. I had previously been using some pre-4.6 build from GIT. The library compiles fine, but now the Python wrapping does not work on my computer.
>> 
>> I am able to load itk in Python, but every time I try to execute anything, the following error appears:
>> 
>>> <ipython-input-12-8e289c4078ab> in <module>()
>>> ----> 1 reader = itk.ImageFileReader.IUC3.New()
>>> 
>>> /usr/local/lib/ITK-4.6/Python/itkLazy.py in __getattribute__(self, attr)
>>>    40             module = self.__lazy_attributes[attr]
>>>    41             namespace = {}
>>> ---> 42             itkBase.LoadModule(module, namespace)
>>>    43             # Load into 'namespace' first, then self.__dict__ (via setattr) to
>>>    44             # prevent the warnings about overwriting the 'NotLoaded' values
>>> 
>>> /usr/local/lib/ITK-4.6/Python/itkBase.py in LoadModule(name, namespace)
>>>    51         if namespace is not None:
>>>    52             swig = namespace.setdefault('swig', imp.new_module('swig'))
>>> ---> 53 swig.__dict__.update(this_module.swig.__dict__)
>>>    54
>>>    55             # don't worry about overwriting the symbols in namespace -- any
>>> 
>>> AttributeError: 'module' object has no attribute 'swig'
>> 
>> I have had this problem before, but previously on Ubuntu I solved it by selecting USE SYSTEM SWIG in CMAKE before compiling. Now, as the version 4.6.0 requires a newer version of swig, this does not work. As a further detail, if I try to manually insert a command, for example in iPython,  tab-completion works until the module names e.g. itk.ImageFileReader, but then stops. It seems that the swig can not be found or is not working properly.
>> 
>> Should I manually set a path to swig? Or is something else wrong instead?
>> 
>> I have installed ITK in the default path /usr/local/lib, as can be seen from the example.
>> 
>> Best,
>> 
>> Sami
> 
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