cython

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PYTHON setup.py build_ext -i
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PYTHON main.py
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############# setup.py ############
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from distutils.core import setup
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from Cython.Build import cythonize
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setup(ext_modules = cythonize('cimport_numpy.pyx'))
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############# numpy.pxd ############
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# A fake Numpy module. This defines a version of _import_array
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# that always fails. The Cython-generated call to _import_array
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# happens quite early (before the stringtab is initialized)
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# and thus the error itself handling could cause a segmentation fault
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# https://github.com/cython/cython/issues/4377
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cdef extern from *:
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    """
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    #define NPY_FEATURE_VERSION
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    static int _import_array(void) {
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        PyErr_SetString(PyExc_ValueError, "Oh no!");
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        return -1;
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    }
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    """
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    int _import_array() except -1
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############# cimport_numpy.pyx ###########
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cimport numpy
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############# main.py ####################
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try:
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    import cimport_numpy
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except ImportError as e:
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    print(e)
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else:
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    assert(False)
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