如何检查3d数组的元素是否为空？

def check_empty_elements(arr):
    for i in range(len(arr)):
        for j in range(len(arr[i])):
            for k in range(len(arr[i][j])):
                if arr[i][j][k] is None:
                    print(f"Element at index ({i}, {j}, {k}) is empty")
                else:
                    print(f"Element at index ({i}, {j}, {k}) is not empty")