boost::python::numpy causing python crash when numpy not installed

報告されている BOOST_PYTHON_MODULE エントリポイントと np::initialize() の呼び出しから始め、numpy が存在しない状態でインポートを再現します。拡張機能のインポート中に、Boost.Python NumPy の初期化が ModuleNotFoundError または ImportError をどのように伝播させるかを調べます。Python で失敗を捕捉でき、インタープリターが終了しなければ完了です。

The following code causes python to exit (crash?) upon import when numpy is not installed. It looks like a ModuleNotFoundError does get thrown but it's not catchable and python simply exits. It's hard to tell if this is exit() being called or an actual crash. I would expect a catchable ModuleNotFoundError or ImportError to be thrown and python not to exit.

#define BOOST_PYTHON_STATIC_LIB
#define BOOST_NUMPY_STATIC_LIB
#include <boost/python.hpp>

#include <boost/python.hpp>
#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
#include <boost/python/numpy.hpp>

namespace py = boost::python;
namespace np = boost::python::numpy;

template<class T>
np::ndarray to_numpy(const std::vector<T> &vec)
{
	Py_intptr_t shape[1] = { static_cast<Py_intptr_t>(vec.size()) };
	np::ndarray result = np::zeros(1, shape, np::dtype::get_builtin<T>());
	std::copy(vec.begin(), vec.end(), reinterpret_cast<T*>(result.get_data()));
	return result;
}

BOOST_PYTHON_MODULE(HelloBoostPython)
{
	np::initialize();

	py::class_<std::vector<double>>("DoubleVector")
		.def(py::init<size_t>())
		.def(py::init<size_t, const double&>())
		.def(py::vector_indexing_suite<std::vector<double>>())
		.def("to_numpy", to_numpy<double>)
		;
}

prompt:

(base) C:\Development\HelloBoostPython\Debug>python
Python 3.7.4 (default, Aug  9 2019, 18:22:51) [MSC v.1915 32 bit (Intel)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import HelloBoostPython
ModuleNotFoundError: No module named 'numpy'
ImportError: numpy.core._multiarray_umath failed to import

(base) C:\Development\HelloBoostPython\Debug>

If it matters, this is with boost 1.70 using visual studio 2017 to build.