Re: [igraph] Python : ImportError: No module named core

[Pascal Jürgens]

Matthew,

python needs to find your igraph  libraries (the c ones) during runtime. By 
installing the python interface, you don't copy the c library itself. The core 
error means that python can't find the installed files, which would normally be 
in a standard location such as /usr/local/lib.

Try pointing your system to the igraph lib directory:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$HOME/system/...(insert your full path 
here)

If you're on linux, you might want to consult the docs on ldconfig for your 
distro.

Hope that helps,

Pascal

On Jul 29, 2010, at 12:17 AM, Matthew Walker wrote:

> Hi,
> 
> I am new to python and thought it would be interesting to try to implement a 
> "radius" measure as a first taste to how igraph and python work together.  
> (I'm assuming "radius" [1] isn't already in igraph... at least I couldn't 
> find it)
> 
> I do not have root access to this computer so I have installed igraph (0.5.3) 
> locally using:
> ./configure --prefix=$HOME/system
> make
> make install
> 
> I then installed python-igraph using:
> python setup.py install --home=$HOME/system
> 
> That all seemed to work without any problems.  But when I try to import 
> igraph into python I get this error:
> 
> $ python
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
> [GCC 4.4.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import igraph
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "igraph/__init__.py", line 30, in <module>
>    from igraph.core import *
> ImportError: No module named core
> 
> I have seen a lot of other emails regarding this error and that there has to 
> be a core.so file in the correct place.  Well, I can't find core.so no matter 
> where I look!  However, neither can I figure out how I should produce core.so.
> 
> I do have libcxcore.so but I suspect that is a completely different story.
> 
> Can someone please tell me what I'm doing wrong? Or at least what to do right 
> ;o)
> 
> Thanks greatly,
> 
> Matthew
> 
> [1] http://mathworld.wolfram.com/GraphRadius.html
> 
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