Function _is_tuple_of_integers

numpy/core/src/multiarray/descriptor.c:756–770

}

static int
_is_tuple_of_integers(PyObject *obj)
{
    int i;

    if (!PyTuple_Check(obj)) {
        return 0;
    }
    for (i = 0; i < PyTuple_GET_SIZE(obj); i++) {
        if (!PyArray_IsIntegerScalar(PyTuple_GET_ITEM(obj, i))) {
            return 0;
        }
    }
    return 1;
}

/*
 * helper function for _try_convert_from_inherit_tuple to disallow dtypes of the form