Function _convert_from_dict

numpy/core/src/multiarray/descriptor.c:1042–1359

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

 * Creates a struct dtype object from a Python dictionary.
 */
static PyArray_Descr *
_convert_from_dict(PyObject *obj, int align)
{
    PyObject *fields = PyDict_New();
    if (fields == NULL) {
        return (PyArray_Descr *)PyErr_NoMemory();
    }
    /*
     * Use PyMapping_GetItemString to support dictproxy objects as well.
     */
    PyObject *names = PyMapping_GetItemString(obj, "names");
    if (names == NULL) {
        Py_DECREF(fields);
        /* XXX should check this is a KeyError */
        PyErr_Clear();
        return _convert_from_field_dict(obj, align);
    }
    PyObject *descrs = PyMapping_GetItemString(obj, "formats");
    if (descrs == NULL) {
        Py_DECREF(fields);
        /* XXX should check this is a KeyError */
        PyErr_Clear();
        Py_DECREF(names);
        return _convert_from_field_dict(obj, align);
    }
    int n = PyObject_Length(names);
    PyObject *offsets = PyMapping_GetItemString(obj, "offsets");
    if (!offsets) {
        PyErr_Clear();
    }
    PyObject *titles = PyMapping_GetItemString(obj, "titles");
    if (!titles) {
        PyErr_Clear();
    }

    if ((n > PyObject_Length(descrs))
        || (offsets && (n > PyObject_Length(offsets)))
        || (titles && (n > PyObject_Length(titles)))) {
        PyErr_SetString(PyExc_ValueError,
                "'names', 'formats', 'offsets', and 'titles' dict "
                "entries must have the same length");
        goto fail;
    }

    /*
     * If a property 'aligned' is in the dict, it overrides the align flag
     * to be True if it not already true.
     */
    PyObject *tmp = PyMapping_GetItemString(obj, "aligned");
    if (tmp == NULL) {
        PyErr_Clear();
    } else {
        if (tmp == Py_True) {
            align = 1;
        }
        else if (tmp != Py_False) {
            Py_DECREF(tmp);
            PyErr_SetString(PyExc_ValueError,