Python问题使用map,lambda,过滤和减少一个函数

我想编辑这个函数,这样就没有 for 循环:仅使用映射、lambda和reduce。

它将以下列表作为输入:

orders = [[1, ("5464", 4, 9.99), ("8274", 18, 12.99), ("9744", 9, 44.95)], 
          [2, ("5464", 9, 9.99), ("9744", 9, 44.95)],
          [3, ("5464", 9, 9.99), ("88112", 11, 24.99)],
          [4, ("8732", 7, 11.99), ("7733", 11, 18.99), ("88112", 5, 39.95)]]

并返回所需的输出:

['9744', 809.1]

然而,它仍然存在 对于 循环,我怎样才能摆脱它们?

def max_book_product(orders):
    dictionary = {}
    for order in orders:
        for book in order[1]:
            if book[0] in dictionary:
                dictionary[book[0]] += book[1] * book[2]
            else:
                dictionary[book[0]] = book[1] * book[2]
    sorted_items = sorted(dictionary.items(), key=lambda tup: tup[1])
    return list(sorted_items.pop())