PYTHON setup.py build_ext -i
PYTHON main.py

############# setup.py ############

from distutils.core import setup
from Cython.Build import cythonize

setup(ext_modules = cythonize('cimport_numpy.pyx'))

############# numpy.pxd ############

# A fake Numpy module. This defines a version of _import_array
# that always fails. The Cython-generated call to _import_array
# happens quite early (before the stringtab is initialized)
# and thus the error itself handling could cause a segmentation fault
# https://github.com/cython/cython/issues/4377

cdef extern from *:
    """
    #define NPY_FEATURE_VERSION
    static int _import_array(void) {
        PyErr_SetString(PyExc_ValueError, "Oh no!");
        return -1;
    }
    """
    int _import_array() except -1
    
############# cimport_numpy.pyx ###########

cimport numpy

############# main.py ####################

try:
    import cimport_numpy
except ImportError as e:
    print(e)
else:
    assert(False)