How does the below code work for sum of integers?

Question

I have the question where i need to find the sum of elements in the given numArray for .

But i am unable to get the desired output i want.

numArray = map(int, input().split()) 

sum_integer = 0
#write your logic to add these 4 numbers here

print(sum_integer) # Print the sum

My solution for that is

for i in range(len(numArray):
   sum_integer=sum_integer+numArray[i]

What is wrong with my solution? And i cannot change the way the input is taken.

Not sure why you got downvoted. This is a legitimate question. The only thing that is missing is the error and traceback. — Mad Physicist, Jul 14 '19 at 15:39
Do you get a SyntaxError or a TypeError? Your code as shown will not work at all. — MisterMiyagi, Jul 14 '19 at 15:44
"TypeError: 'map' object is not subscriptable " This the error i am getting — Sathwik, Jul 14 '19 at 15:47
Note that whoever wrote that exercise is misleading you. ``numArray`` is not an array/list - it is an iterator. — MisterMiyagi, Jul 14 '19 at 15:47
Can you tell me what should i do then? and if you can also possibly tell me what is an iterator.I am new to programming — Sathwik, Jul 14 '19 at 15:50
@Sathwik iterator, as opposed to a list, does not hold all the data in memory at any given moment. Rather it lets you *iterate* over it, fetching each element one by one and only occupying "one slot" in memory each time. This feature gives a lot of power for different scenarios. read more [here](https://stackoverflow.com/questions/4703390/how-to-extract-a-floating-number-from-a-string) — Tomerikoo, Jul 14 '19 at 16:18

score 3 · Answer 1 · edited Jul 14 '19 at 15:38

Your problem is that map(int, input().split()) returns a map object which is an iterator, not a list. To illustrate, your code would work if you converted it to a list.

numArray = list(map(int, input().split()))

As the comments have point out, there are other, better ways to go about it. Changing the for loop to

for i in numArray:
    sum_integer += i

is a better solution, and doesn't force you to enter exactly 4 numbers. The other suggestion in the comments, to simply use

print(sum(map(int, input().split())))

which does all the steps in one line is far more concise.

How does the below code work for sum of integers?

1 Answers1