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Expand dtype accessors (#3868)
* Added constructor based on typenum, based on PyArray_DescrFromType Added accessors for typenum, alignment, byteorder and flags fields of PyArray_Descr struct. * Added tests for new py::dtype constructor, and for accessors * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Fixed the comment for alignment method * Update include/pybind11/numpy.h Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com> * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
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@ -562,6 +562,13 @@ public:
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m_ptr = from_args(std::move(args)).release().ptr();
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}
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explicit dtype(int typenum)
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: object(detail::npy_api::get().PyArray_DescrFromType_(typenum), stolen_t{}) {
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if (m_ptr == nullptr) {
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throw error_already_set();
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}
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}
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/// This is essentially the same as calling numpy.dtype(args) in Python.
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static dtype from_args(object args) {
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PyObject *ptr = nullptr;
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@ -596,6 +603,23 @@ public:
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return detail::array_descriptor_proxy(m_ptr)->type;
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}
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/// type number of dtype.
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ssize_t num() const {
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// Note: The signature, `dtype::num` follows the naming of NumPy's public
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// Python API (i.e., ``dtype.num``), rather than its internal
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// C API (``PyArray_Descr::type_num``).
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return detail::array_descriptor_proxy(m_ptr)->type_num;
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}
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/// Single character for byteorder
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char byteorder() const { return detail::array_descriptor_proxy(m_ptr)->byteorder; }
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/// Alignment of the data type
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int alignment() const { return detail::array_descriptor_proxy(m_ptr)->alignment; }
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/// Flags for the array descriptor
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char flags() const { return detail::array_descriptor_proxy(m_ptr)->flags; }
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private:
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static object _dtype_from_pep3118() {
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static PyObject *obj = module_::import("numpy.core._internal")
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@ -291,6 +291,7 @@ py::list test_dtype_ctors() {
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list.append(py::dtype(names, formats, offsets, 20));
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list.append(py::dtype(py::buffer_info((void *) 0, sizeof(unsigned int), "I", 1)));
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list.append(py::dtype(py::buffer_info((void *) 0, 0, "T{i:a:f:b:}", 1)));
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list.append(py::dtype(py::detail::npy_api::NPY_DOUBLE_));
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return list;
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}
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@ -440,6 +441,34 @@ TEST_SUBMODULE(numpy_dtypes, m) {
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}
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return list;
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});
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m.def("test_dtype_num", [dtype_names]() {
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py::list list;
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for (const auto &dt_name : dtype_names) {
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list.append(py::dtype(dt_name).num());
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}
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return list;
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});
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m.def("test_dtype_byteorder", [dtype_names]() {
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py::list list;
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for (const auto &dt_name : dtype_names) {
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list.append(py::dtype(dt_name).byteorder());
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}
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return list;
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});
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m.def("test_dtype_alignment", [dtype_names]() {
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py::list list;
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for (const auto &dt_name : dtype_names) {
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list.append(py::dtype(dt_name).alignment());
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}
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return list;
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});
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m.def("test_dtype_flags", [dtype_names]() {
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py::list list;
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for (const auto &dt_name : dtype_names) {
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list.append(py::dtype(dt_name).flags());
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}
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return list;
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});
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m.def("test_dtype_methods", []() {
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py::list list;
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auto dt1 = py::dtype::of<int32_t>();
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@ -160,6 +160,7 @@ def test_dtype(simple_dtype):
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d1,
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np.dtype("uint32"),
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d2,
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np.dtype("d"),
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]
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assert m.test_dtype_methods() == [
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@ -175,8 +176,13 @@ def test_dtype(simple_dtype):
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np.zeros(1, m.trailing_padding_dtype())
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)
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expected_chars = "bhilqBHILQefdgFDG?MmO"
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assert m.test_dtype_kind() == list("iiiiiuuuuuffffcccbMmO")
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assert m.test_dtype_char_() == list("bhilqBHILQefdgFDG?MmO")
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assert m.test_dtype_char_() == list(expected_chars)
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assert m.test_dtype_num() == [np.dtype(ch).num for ch in expected_chars]
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assert m.test_dtype_byteorder() == [np.dtype(ch).byteorder for ch in expected_chars]
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assert m.test_dtype_alignment() == [np.dtype(ch).alignment for ch in expected_chars]
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assert m.test_dtype_flags() == [chr(np.dtype(ch).flags) for ch in expected_chars]
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def test_recarray(simple_dtype, packed_dtype):
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