Function _convert_from_field_dict

numpy/core/src/multiarray/descriptor.c:1023–1037

* a dictionary specifying a data-type * must have at least two and up to four * keys These must all be sequences of the same length. * * can also have an additional key called "metadata" which can be any dictionary * * "names" --- field names * "formats" --- the data-type descriptors for the field. * * Optional: * * "offsets" --- integers indicating the offset into the * record of the

 * then it will be checked for conformity and used directly.
 */
static PyArray_Descr *
_convert_from_field_dict(PyObject *obj, int align)
{
    PyObject *_numpy_internal;
    PyArray_Descr *res;

    _numpy_internal = PyImport_ImportModule("numpy.core._internal");
    if (_numpy_internal == NULL) {
        return NULL;
    }
    res = (PyArray_Descr *)PyObject_CallMethod(_numpy_internal,
            "_usefields", "Oi", obj, align);
    Py_DECREF(_numpy_internal);
    return res;
}

/*
 * Creates a struct dtype object from a Python dictionary.