[Discuss-gnuradio] SWIG - ImportError: dynamic module does not define init function

[sudhindra aithal kota]

Sorry for posting it on the GNURadio group.But I did
not find an answer on google.Can someone please help?

I am learning to use SWIG and while doing to first
example in the manual 
something went wrong.
Here is the example I am referring to:
http://www.swig.org/Doc1.3/Introduction.html#n8
I am trying to build the python wrapper.
I am running gentoo linux with SWIG 1.3.19 and python
2.2.2
I did these command and everything seemed to work:
$ swig -python example.i
$ gcc -c -fpic example.c example_wrap.c
-I/usr/include/python2.2   
#<--location of Python.h in gentoo
$ gcc -shared example.o example_wrap.o -o _example.so

I now have at this point all of these files in my home
directory:
example.i
example.c
example_wrap.c
example.o
example_wrap.o
_example.so

I then start python and try to import example:
 >>> import example
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ImportError: dynamic module does not define init
function (initexample)
 >>>

Now before anybody points me back to the manual, I
realize that the 
manual addresses this:
FROM THE MANUAL:
-----------------------------------------------------------------------------------------------------------------
Another possible error is the following:

 >>> import example
Traceback (most recent call last):
  File "", line 1, in ?
ImportError: dynamic module does not define init
function (init_example)
 >>>                                                  
           

 
This error is almost always caused when a bad name is
given to the 
shared object file. For example, if you created a file
example.so 
instead of _example.so you would get this error.
Alternatively, this 
error could arise if the name of the module is
inconsistent with the 
module name supplied with the %module directive.
Double-check the 
interface to make sure the module name and the shared
object filename 
match. Another possible cause of this error is
forgetting to link the 
SWIG-generated wrapper code with the rest of your
application when 
creating the extension module.
_________________________________________________________________________

 From my above the description, you can see that none
of the problems 
stated in the manual describe my problem.  I have the
correct name 
(_example.so).  The name of the module  directive is
correct (I copied 
it from the manual, and double checked it, the line
reads "%module 
example"). And the wrapper code should be properly
linked because I 
copied the commands directly from the manual.

Also, some other interesting things that I can do:
1. running $python -i example.py
will import the module and allow me to do fact(4)
2. i cam inport _example to link to the object
directly and I can do 
_example.fact(4).

However, I want to be able to do things the way it is
described in the 
manual.

Another interesting thing is that my error in python
says that the 
module does not define "initexample" and the manual
describes the error 
as not defining "init_example".  Note the lack of the
underscore in the 
error I get.  Could this be the problem?  It is
looking for initexample 
when it should be looking for init_example?


                
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