How do I add together integers in a list in python? [closed]

问题

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Closed 6 years ago.

If I had a list like

x = [2, 4, 7, 12, 3]

What function/process would I use to add all of the numbers together?

Is there any way other than using sum ()?

回答1:

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.

回答2:

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)

回答3:

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

回答4:

you can try :

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

来源：https://stackoverflow.com/questions/13909052/how-do-i-add-together-integers-in-a-list-in-python