Can't import numpy from C

Question

I am failing to open numpy with the Python C API. I have the following code

#include<Python.h>
int main()
{
    Py_Initialize();
    PyRun_SimpleString("import numpy");
    PyObject* numpy = PyImport_ImportModule("numpy");
    Py_Finalize();
    return 0;
}

The line PyRun_SimpleString("import numpy") prints to console:

Traceback (most recent call last): File "", line 1, in File "C:\Users\matt.heath\AppData\Local\Continuum\Anaconda3\lib\site-packages\numpy__init__.py", line 180, in from . import add_newdocs File "C:\Users\matt.heath\AppData\Local\Continuum\Anaconda3\lib\site-packages\numpy\add_newdocs.py", line 13, in from numpy.lib import add_newdoc File "C:\Users\matt.heath\AppData\Local\Continuum\Anaconda3\lib\site-packages\numpy\lib__init__.py", line 8, in from .type_check import * File "C:\Users\matt.heath\AppData\Local\Continuum\Anaconda3\lib\site-packages\numpy\lib\type_check.py", line 11, in import numpy.core.numeric as _nx File "C:\Users\matt.heath\AppData\Local\Continuum\Anaconda3\lib\site-packages\numpy\core__init__.py", line 14, in from . import multiarray ImportError: cannot import name 'multiarray'

and PyImport_ImportModule("numpy") returns NULL.

I can open other modules OK (e.g. PyRun_SimpleString("import chunk"); is fine) and import numpyworks just fine from Python in a console.

I am using Windows 10 and Python 3.5.

What can I do?

Answer 1

Actually, this is only a problem in a debug build. I built python35_d.dll myself while the release dll was already compiled so maybe I had some weird setting in the make file or something. Anyway, I can live without debug, I guess.