Summarize list in python

Question

I have a list:

[5.130, 9.345, 0.134, -7.234, 4.321, -46.321]

and I try to get this list:

[5.130, 14.475, 14.609, 7.372,  11.693, -34.628]

that is:

5.130+9.345=14.475
14.475+0.134=14.609
14.609+(-7.234)=7.372
7.372+4.321=11.693
11.693+(-46.321)=-34.628

What have you tried to get the results you want? – Cow Jan 03 '23 at 09:02 — Cow, Jan 03 '23 at 09:02

score 0 · Answer 1 · answered Jan 03 '23 at 09:13

result = ['{:0.3f}'.format(sum(lst[:i+1])) for i in range(len(lst))]
print(result)

Output:

['5.130', '14.475', '14.609', '7.375', '11.696', '-34.625']

I'm not getting the same results as you but I think your calculations are wrong (14.609+(-7.234)=7.375).

score 0 · Answer 2 · answered Jan 03 '23 at 09:13

So you need to make a list of cumulative sums. You can do it by using for loop and .append() method

a = [5.130, 9.345, 0.134, -7.234, 4.321, -46.321]

cumulative_sum = []
new_sum = 0
for i in a:
    new_sum += i
    cumulative_sum.append(new_sum)
print(cumulative_sum)

Summarize list in python

2 Answers2