如何从嵌套列表中的每个子列表中提取倒数第二个元素？

nested_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
result = [sublist[-2] for sublist in nested_list]
print(result)

def extract_last_two(nested_list):
    result = []
    for item in nested_list:
        if isinstance(item, list):
            if len(item) >= 2:
                result.append(item[-2])
            else:
                result.extend(extract_last_two(item))
    return result

nested_list = [[1, 2, 3], [4, 5, [6, 7]], [[8, 9, 10], [11, 12, 13, [14, 15]]]]
result = extract_last_two(nested_list)
print(result)