finding sum using for loop in python

Question

when we have to add in python via for loops then we have to type something like this:

>>> list(range(1,10))
[1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> total=0
... for element in range(1,10) :
...     total+=element
>>> print(total)
45

But i tried doing something else, i did not defined total in the benign and later just defined total as (total=element). and when i print total then every time 4 is coming no matter which number sequence i have. Can any one explain the reason that why every time 4 is coming?

Possible duplicate of [for loop in Python](https://stackoverflow.com/questions/4170656/for-loop-in-python) — Ravi Kumar Yadav, Jun 24 '18 at 11:16
This is because print statement is not in that for loop but outside of that which is considering the last iteration of your loop and thus last value of the list `a`. — Vicrobot, Jun 24 '18 at 11:25
@roxaite Please do not post pictures of code and error messages, post the text directly here on SO. — Mr. T, Jun 24 '18 at 11:49

Andrii Chumakov · Answer 1 · 2019-04-28T12:24:58.400

1

Why do you need for loops for that?

print(sum(range(10))

The thing, you've said did not really work, because that's the way for loop works. It replaced total with the element it used right now.

edited Apr 28 '19 at 12:24

answered Jan 13 '19 at 11:23

Andrii Chumakov

279
3
12

score 0 · Answer 2 · answered Jun 24 '18 at 11:16

0

You replaced total += e with total = e. So only the last value is used.

answered Jun 24 '18 at 11:16

Eugene Primako

2,767
9
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score 0 · Answer 3 · answered Jun 24 '18 at 12:09

You have a list a = [1,2,3,4] and total = 0 Then, you are iteration the list

for e in a:
    total = a
print (total)

In every iteration the value of total is replacing with a and at the last iteration the value of a (= 4) is replacing the previous value of total. That's why it's printing 4 every time.

If you want to get the total value just replace

total = a

with

total += a

finding sum using for loop in python

3 Answers3