Function PyArray_DebugPrint

numpy/core/src/multiarray/arrayobject.c:495–551

NUMPY_API * Prints the raw data of the ndarray in a form useful for debugging * low-level C issues. */

 * low-level C issues.
 */
NPY_NO_EXPORT void
PyArray_DebugPrint(PyArrayObject *obj)
{
    int i;
    PyArrayObject_fields *fobj = (PyArrayObject_fields *)obj;

    printf("-------------------------------------------------------\n");
    printf(" Dump of NumPy ndarray at address %p\n", obj);
    if (obj == NULL) {
        printf(" It's NULL!\n");
        printf("-------------------------------------------------------\n");
        fflush(stdout);
        return;
    }
    printf(" ndim   : %d\n", fobj->nd);
    printf(" shape  :");
    for (i = 0; i < fobj->nd; ++i) {
        printf(" %" NPY_INTP_FMT, fobj->dimensions[i]);
    }
    printf("\n");

    printf(" dtype  : ");
    PyObject_Print((PyObject *)fobj->descr, stdout, 0);
    printf("\n");
    printf(" data   : %p\n", fobj->data);
    printf(" strides:");
    for (i = 0; i < fobj->nd; ++i) {
        printf(" %" NPY_INTP_FMT, fobj->strides[i]);
    }
    printf("\n");

    printf(" base   : %p\n", fobj->base);

    printf(" flags :");
    if (fobj->flags & NPY_ARRAY_C_CONTIGUOUS)
        printf(" NPY_C_CONTIGUOUS");
    if (fobj->flags & NPY_ARRAY_F_CONTIGUOUS)
        printf(" NPY_F_CONTIGUOUS");
    if (fobj->flags & NPY_ARRAY_OWNDATA)
        printf(" NPY_OWNDATA");
    if (fobj->flags & NPY_ARRAY_ALIGNED)
        printf(" NPY_ALIGNED");
    if (fobj->flags & NPY_ARRAY_WRITEABLE)
        printf(" NPY_WRITEABLE");
    if (fobj->flags & NPY_ARRAY_WRITEBACKIFCOPY)
        printf(" NPY_WRITEBACKIFCOPY");
    printf("\n");

    if (fobj->base != NULL && PyArray_Check(fobj->base)) {
        printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
        printf("Dump of array's BASE:\n");
        PyArray_DebugPrint((PyArrayObject *)fobj->base);
        printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
    }
    printf("-------------------------------------------------------\n");
    fflush(stdout);
}