Linker error: C/C++ Extensions for python

Question

As my title kind of says, I'm trying to develop a C extension for Python. I followed this tutorial here and I ran the setup.py script. How ever when I run the python interpreter and try to import my newly created module, I get a linker error undefined symbol: py_BuildValue. I also tryed to compile it my self and I got the same errors plus an error saying Py_InitModule3 is undefined. I have installed both python3.2-dev and python3-dev. Here is my test.c code:

#include <python3.2/Python.h>
static PyObject* Test(PyObject* self){
    return py_BuildValue("s","This is a test and my first trip into the world of python bindings!!");
}

static PyMethodDef test_funcs[] ={{"testExtensions",(PyCFunction)Test, METH_NOARGS,"This is my First Extension!!"},{NULL}};

 void initTest(void){
    Py_InitModule3("Test", test_funcs, "Extension module example!");
}

And my setup.py code:

from distutils.core import setup, Extension
setup(name='Test', version='1.0',  \
    ext_modules=[Extension('Test', ['test.c'])])

Dolda2000 · Accepted Answer · 2014-09-03 01:53:43Z

2

That's because the function is called Py_BuildValue rather than py_BuildValue. C is case sensitive. If you check further up in your compile messages, you probably also have a warning there about the function being implicitly declared.

answered Sep 3, 2014 at 1:53

Dolda2000

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4 Comments

rady Over a year ago

Oh hmm. I was following a tutorial. Infact the cody is copied and pasted. But I guess that could be it Thanks.

rady Over a year ago

I followed up on this. I have been known do stupid things like that but it would appear that's not the issue.

Dolda2000 Over a year ago

@rady: Are you sure it's the same error? When I try to compile your code but correct the Py_BuildValue capitalization, the error moves to build about Py_InitModule3 instead, which is understandable since that's a Python 2 function, while at appears you're trying to compile for Python 3.

rady Over a year ago

it is the second error. How would I adapt this for python3

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