试分析以下代码，并给每句代码加上注释：import random n = 10 a = [random.randint(0, 100) for _ in range(n)] b = [random.randint(0, 100) for _ in range(n)] print(a,b) def swap(a, b): sum_a = sum(a) sum_b = sum(b) diff = sum_a - sum_b print("列表a的和为：",sum_a,"列表b的和为：",sum_b,"两列表差值为：",diff) while True: best_i, best_j, best_change = 0, 0, 0 for i in range(len(a)): #对所有的元素进行比较 for j in range(len(b)): change = a[i] - b[j] if abs(diff-2*change) < abs(diff-2*best_change): best_change = change best_i = i best_j = j if best_change == 0: #差为0已经是最小，不能再减小了 return False a[best_i], b[best_j] = b[best_j], a[best_i] sum_a -= best_change sum_b += best_change diff = sum_a - sum_b swap(a, b) print("数据交换后列表a为：",a,"数据交换后列表b为：",b,"\n","两列表差值最小为：",sum(a)-sum(b))

这段代码的功能是随机生成两个长度为n的列表a和b，然后通过交换列表中的元素，使得两个列表的元素和之差最小。代码注释如下：

import random   # 导入random模块

n = 10   # 列表长度为10
a = [random.randint(0, 100) for _ in range(n)]   # 生成长度为n的随机列表a
b = [random.randint(0, 100) for _ in range(n)]   # 生成长度为n的随机列表b
print(a,b)   # 输出列表a和b的内容

def swap(a, b):   # 定义一个交换函数
    sum_a = sum(a)   # 列表a的元素和
    sum_b = sum(b)   # 列表b的元素和
    diff = sum_a - sum_b   # 两个列表元素和之差
    print("列表a的和为：",sum_a,"列表b的和为：",sum_b,"两列表差值为：",diff)   # 输出两个列表的元素和和差值

    while True:   # 无限循环
        best_i, best_j, best_change = 0, 0, 0   # 初始化变量
        for i in range(len(a)):   # 对a列表中的所有元素进行比较
            for j in range(len(b)):   # 对b列表中的所有元素进行比较
                change = a[i] - b[j]   # 计算交换后的差值
                if abs(diff-2*change) < abs(diff-2*best_change):   # 如果交换后的差值比之前的更小
                    best_change = change   # 更新最小差值
                    best_i = i   # 记录a列表的索引
                    best_j = j   # 记录b列表的索引
        if best_change == 0:   # 如果差为0已经是最小，不能再减小了
            return False   # 返回False
        a[best_i], b[best_j] = b[best_j], a[best_i]   # 交换两个列表中的元素
        sum_a -= best_change   # 更新列表a的元素和
        sum_b += best_change   # 更新列表b的元素和
        diff = sum_a - sum_b   # 更新两个列表元素和之差

swap(a, b)   # 调用函数
print("数据交换后列表a为：",a,"数据交换后列表b为：",b,"\n","两列表差值最小为：",sum(a)-sum(b))   # 输出交换后的两个列表以及最小差值