python中多层嵌套列表的平均值

def average_nested_list(nested_list):
    total = 0
    count = 0

    for sublist in nested_list:
        for num in sublist:
            total += num
            count += 1

    if count == 0:
        return 0  # 避免除以0的错误

    average = total / count
    return average

nested_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
average = average_nested_list(nested_list)
print("平均值:", average)

平均值: 5.0