在2D列表中查找最高平均值

def find_highest_average(list_2d):
    highest_average = float('-inf')  # 保存最高平均值
    highest_average_index = -1  # 保存最高平均值对应的列表索引

    for i, sublist in enumerate(list_2d):
        sublist_sum = sum(sublist)  # 计算列表中所有元素的总和
        sublist_average = sublist_sum / len(sublist)  # 计算平均值

        if sublist_average > highest_average:
            highest_average = sublist_average
            highest_average_index = i

    return list_2d[highest_average_index]

# 示例用法
my_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
result = find_highest_average(my_list)
print("最高平均值的列表是：", result)