如何将python列表中的整数相加？
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How do I add together integers in a list in python?
提问by MaxwellBrahms
If I had a list like
如果我有一个像
x = [2, 4, 7, 12, 3]
What function/process would I use to add all of the numbers together?
我将使用什么函数/过程将所有数字相加？
Is there any way other than using sum ()?
除了使用sum()还有什么办法吗？
采纳答案by The Recruit
x = [2, 4, 7, 12, 3]
sum_of_all_numbers= sum(x)
or you can try this:
或者你可以试试这个：
x = [2, 4, 7, 12, 3]
sum_of_all_numbers= reduce(lambda q,p: p+q, x)
Reduce is a way to perform a function cumulatively on every element of a list. It can perform any function, so if you define your own modulus function, it will repeatedly perform that function on each element of the list. In order to avoid defining an entire function for performing p+q, you can instead use a lambda function.
Reduce 是一种在列表的每个元素上累积执行函数的方法。它可以执行任何功能，因此如果您定义自己的模数函数，它将对列表的每个元素重复执行该功能。为了避免定义用于执行 p+q 的整个函数，您可以改用 lambda 函数。
回答by Hymancogdill
This:
这个：
sum([2, 4, 7, 12, 3])
You use sum()to add all the elements in a list.
您用于sum()添加列表中的所有元素。
So also:
所以也是：
x = [2, 4, 7, 12, 3]
sum(x)
回答by Yuanhang Guo
you can try :
你可以试试 ：
x = [2, 4, 7, 12, 3]
total = sum(x)
回答by RandomPhobia
First Way:
第一种方式：
my_list = [1,2,3,4,5]
list_sum = sum(list)
Second Way(less efficient):
第二种方式（效率较低）：
my_list = [1,2,3,4,5]
list_sum = 0
for x in my_list:
list_sum += x
