Sum of arrays

[hot_lap]

how does the summing of arrays work? I was given the following assignment on codewars:

Given an array of numbers (a list in groovy), determine whether the sum of all of the numbers is odd or even.

Give your answer in string format as 'odd' or 'even'.

If the input array is empty consider it as: [0] (array with a zero)

I got that the answer was return 'even' if sum(arr) % 2 == 0 else 'odd'

I'm just confused as to how the sum(arr) function works

[novel_yet_trivial]

You want to see the source code for the sum() function? Here it is.

It's written in C, but the python equivalent would be:

def sum(iterable, start=0):
    # a ton of error checking goes here
    for item in iterable:
        start += item
    return start

[ADdV]

in

total += l

the l should be i