How do I add together integers in a list (sum a list of numbers) in python?

Question

Suppose I have a list of integers like [2, 4, 7, 12, 3]. How can I add all of the numbers together, to get 28?

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Answer 1

This:

sum([2, 4, 7, 12, 3])

You use sum() to add all the elements in a list.

So also:

x = [2, 4, 7, 12, 3]
sum(x)

Answered By: jackcogdill

Answer 2

you can try :

x = [2, 4, 7, 12, 3]    
total = sum(x)

Answered By: Yuanhang Guo

Answer 3

x = [2, 4, 7, 12, 3]
sum_of_all_numbers= sum(x)

or you can try this:

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.

Answered By: The Recruit

Answer 4

First Way:

my_list = [1,2,3,4,5]
list_sum = sum(list)

Second Way(less efficient):

my_list = [1,2,3,4,5]

list_sum = 0
for x in my_list:
   list_sum += x

Answered By: RandomPhobia

How do I add together integers in a list (sum a list of numbers) in python?

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