ImportError: No module named _iio_swig

[christophjurczyk]

Hi, I am trying to include an IIO device in Gnuradio, but have some issues with the iio package. I installed the package on my Manjaro as follows:

git clone https://github.com/analogdevicesinc/gr-iio.git cd gr-iio cmake -DCMAKE_INSTALL_PREFIX=/usr . make sudo make install cd .. sudo ldconfig

When I try to include iio in python, following error occurs:

-> from gnuradio import iio Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.7/site-packages/gnuradio/iio/init.py", line 35, in from iio_swig import * File "/usr/lib/python2.7/site-packages/gnuradio/iio/iio_swig.py", line 17, in _iio_swig = swig_import_helper() File "/usr/lib/python2.7/site-packages/gnuradio/iio/iio_swig.py", line 16, in swig_import_helper return importlib.import_module('_iio_swig') File "/usr/lib/python2.7/importlib/init.py", line 37, in import_module import(name) ImportError: No module named _iio_swig

When I add the package to the PYTHONPATH, I get following error:

-> import sys -> print sys.path ['', '/usr/lib/python27.zip', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/lib/python2.7/site-packages', '/usr/lib/python2.7/site-packages/gtk-2.0', '/usr/lib/python2.7/site-packages/wx-3.0-gtk3'] -> sys.path.append("/usr/lib/python2.7/site-packages/gnuradio/iio") -> from gnuradio import iio Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.7/site-packages/gnuradio/iio/init.py", line 35, in from iio_swig import * File "/usr/lib/python2.7/site-packages/gnuradio/iio/iio_swig.py", line 17, in _iio_swig = swig_import_helper() File "/usr/lib/python2.7/site-packages/gnuradio/iio/iio_swig.py", line 16, in swig_import_helper return importlib.import_module('_iio_swig') File "/usr/lib/python2.7/importlib/init.py", line 37, in import_module import(name) ImportError: libad9361.so.0: cannot open shared object file: No such file or directory

Does anyone have an idea how to fix this issue? Many thanks in advance. Christoph

[tfcollins]

Make sure the libad9361 libraries are on path as well, or just move them to /usr/lib/. gr-iio should be available in the AUR as well.

[christophjurczyk]

Thanks for your help. I copied the compiled libad9361 library to /usr/lib/libad9361. When I now try in import it to python, my complete python environment crashes. Any ideas?

Python 2.7.16 (default, Mar 11 2019, 18:59:25) [GCC 8.2.1 20181127] on linux2 Type "help", "copyright", "credits" or "license" for more information. -> from gnuradio import iio Segmentation fault (core dumped)

In gnuradio I get still the same error. I installed the gnuradio block with the help of package with an arch linux package manager. But this returns the same error in gnuradio.

[tfcollins]

My guess is that its loading things incorrectly and/or cannot find headers. The only way to really debug it would be to enable debug symbols and run gdb.

[mariobaldini]

Hello,

I am facing a similar issue in a Fedora 30 environment.

(...)
  File "/usr/lib64/python2.7/site-packages/gnuradio/iio/iio_swig.py", line 16, in swig_import_helper
    return importlib.import_module('_iio_swig')
  File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named _iio_swig

Installation steps:

cd ~/code
git clone https://github.com/analogdevicesinc/libiio.git
cd libiio
cmake -DLIB_SUFFIX=64 .
make 
sudo make install
cd ..

cd ~/code
git clone https://github.com/analogdevicesinc/libad9361-iio.git
cd libad9361-iio
cmake -DLIB_SUFFIX=64 .
make 
sudo make install
cd ..

cd ~/code
git clone https://github.com/analogdevicesinc/gr-iio.git
cd gr-iio
# cmake -DCMAKE_INSTALL_PREFIX=/usr .
cmake -DLIB_SUFFIX=64 -DCMAKE_INSTALL_PREFIX=/usr .

make 
sudo make install
cd ..
sudo ldconfig

cp -r /usr/local/lib64/python2.7/site-packages/gnuradio/iio /usr/lib64/python2.7/site-packages/gnuradio

I tried the lib copy indicated in the wiki (cp -r /usr/local/lib/python2.7/dist-packages/gnuradio/iio /usr/lib/python2.7/dist-packages/gnuradio/) just updating the lib64 and site-packages fields, as they seemed to be different in this evironment.

Although I still can not fix and not sure what is wrong.

Could someone please advise what should I do?

echo $PATH
/home/mario/.local/bin:/home/mario/bin:/usr/share/Modules/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin

/usr contents: https://www.dropbox.com/s/wnbqbui47e5hcdf/list-usr.txt?dl=0 Installed packages: https://www.dropbox.com/s/gd79h6wnrv6t8ek/list-installed-packages.txt?dl=0

Thank you Mario

[tfcollins]

For Fedora you will likely have to add the python blocks to your PYTHONPATH. Try explicitly add the gnuradio/iio folder

[mariobaldini]

@tfcollins Indeed, I needed to add it to the PYTHONPATH: echo "export PYTHONPATH=/usr/lib64/python2.7/site-packages/gnuradio/iio" >> ~/.bashrc

and also copy libad9361 to the proper path, to fix another error after that: sudo cp /usr/local/lib/libad9361.so* /usr/local/lib64 (although it was built with the proper sufix cmake -DLIB_SUFFIX=64 ., this copy was also necessary).

[christophjurczyk]

I solved my ImportError. First of all I switched to the current version of Ubuntu and followed the installation guide. In addition I had to execute following commands:

cp /usr/include/gnuradio/swig/*.i swig/ cp /usr/include/gnuradio/swig/gnuradio_swig_bug_workaround.h swig/

Thanks for your advises.

[mariobaldini]

PS: On Fedora I also needed to copy the libad9361 to the following location: sudo cp /usr/local/lib64/libad9361* /usr/lib64/

Not sure that is the exactly single place for it in Fedora x64, but it works now.