将两个列表中的值相乘并将它们打印出来python

Question

我正在努力做到这一点，以便我可以将每个成本乘以相应的销售产品数量。例如，1.99 * 10、1.49 * 5 等等。另外，我似乎无法弄清楚如何根据列表中的成本打印出最昂贵或最便宜产品的产品名称。我尝试将 product_cost 中的 i 与 product_sold 的相应 i 相乘，但答案似乎很遥远。有谁知道如何解决这个问题？谢谢

但是，使用下面的代码，

# product lists
product_names = ["prime numbers", "multiplication tables", "mortgage calculator"]
product_costs = [1.99, 1.49, 2.49]
product_sold = [10, 5, 15]

def report_product():
    total = 0
    print("Most expensive product:", max(product_costs))
    print("Least expensive product:", min(product_costs))
    for i in range(len(product_costs)):
        total += i * product_sold[i]
    print("Total value of all products:", total)

selection = ""

while selection != "q":
    selection = input("(s)earch, (l)ist, (a)dd, (r)emove, (u)pdate, r(e)port or (q)uit: ")

    if selection == 'q':
        break
    elif selection == 's':
        search_product()
    elif selection == "l":
        list_products()
    elif selection == "a":
        add_products()
    elif selection == "r":
        remove_products()
    elif selection == "u":
        update_products()
    elif selection == "e":
        report_product()
    else:
        print("Invalid option, try again")

print("Thanks for looking at my programs!")

Answer 1

虽然不一定是最佳的，但您可以使用zip() 用最少的代码得到答案：

def report_product():

    print('Most expensive product:', max(zip(product_costs, product_names))[1])

    print('Least expensive product:', min(zip(product_costs, product_names))[1])

    total_earned = sum(cost * sold for cost, sold in zip(product_costs, product_sold))

    print('Total earned from all products sold: ${:.2f}'.format(total_earned))

输出

Most expensive product: mortgage calculator
Least expensive product: multiplication tables
Total earned from all products sold: $64.70

Answer 2

>>> prod_m = [a*b for a,b in zip(product_costs, product_sold)]
>>> prod_m
[19.9, 7.45, 37.35]
>>> product_names[product_costs.index(max(product_costs))]
'mortgage calculator'
>>> product_names[product_costs.index(min(product_costs))]
'multiplication tables'

您还可以使用 numpy 将两个列表相乘。

>>> import numpy
>>> list(numpy.array(product_costs)*numpy.array(product_sold))
[19.899999999999999, 7.4500000000000002, 37.350000000000001]

Answer 3

要得到一个新的对应索引相乘的数组，

product_costs = [1.99, 1.49, 2.49]
product_sold = [10, 5, 15]
product_mult = list(map(lambda x,y: x*y, product_costs,product_sold))

要找出最贵的产品名称，

index = product_costs.index(max(product_costs))
most_expensive = product_names[index]