将两个字典的值相乘然后求和 [英] Multiplying and then summing values from two dictionaries

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问题描述

我需要乘以每个键的值,然后将所有值添加到一起打印一个数字。我知道这可能超级简单,但我被困住了



在我看来,我会解决这个问题,例如:


$ b $
total = sum(v *(v in stock))
print total

但是这样的事情不会奏效:)

  price = {
banana:4,
apple:2,
orange:1.5,
pear:3}

stock = {
banana:6,
apple:0,
orange:32,
pear b $ b


解决方案

如果您想要个人,可以使用字母理解:

 >>> {k:价格[k] * k价格中的k价格} 
{'orange':48.0,'pear':45,'banana':24,'apple':0}

或直接转到总计:

 >>>总和(价格[k] *股价[k] k价格)
117.0


I need to multiply the values from each key and then add all the values together to print a single number. I know this probably super simple but i'm stuck

In my mind, I'd address this with something like:

for v in prices:
total = sum(v * (v in stock))
print total

But something like that isn't going to work :)

prices = {
"banana": 4,
"apple": 2,
"orange": 1.5,
"pear": 3 }

stock = {
"banana": 6,
"apple": 0,
"orange": 32,
"pear": 15 }

解决方案

You could use a dict comprehension if you wanted the individuals:

>>> {k: prices[k]*stock[k] for k in prices}
{'orange': 48.0, 'pear': 45, 'banana': 24, 'apple': 0}

Or go straight to the total:

>>> sum(prices[k]*stock[k] for k in prices)
117.0

这篇关于将两个字典的值相乘然后求和的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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