#6_kyu_Equal_Sides_Of_An_Array.py

Description:

"""
You are going to be given an array of integers. Your job is to take that array and find an index N where the sum of the integers to the left of N is equal to the sum of the integers to the right of N. If there is no index that would make this happen, return -1.
For example:
Let's say you are given the array {1,2,3,4,3,2,1}:Your function will return the index 3, because at the 3rd position of the array, the sum of left side of the index ({1,2,3}) and the sum of the right side of the index ({3,2,1}) both equal 6.
Let's look at another one.You are given the array {1,100,50,-51,1,1}:Your function will return the index 1, because at the 1st position of the array, the sum of left side of the index ({1}) and the sum of the right side of the index ({50,-51,1,1}) both equal 1.
Last one:You are given the array {20,10,-80,10,10,15,35}At index 0 the left side is {}The right side is {10,-80,10,10,15,35}They both are equal to 0 when added. (Empty arrays are equal to 0 in this problem)Index 0 is the place where the left side and right side are equal.  
Note: Please remember that in most programming/scripting languages the index of an array starts at 0.
Input:An integer array of length 0 < arr < 1000. The numbers in the array can be any integer positive or negative.
Output:The lowest index N where the side to the left of N is equal to the side to the right of N. If you do not find an index that fits these rules, then you will return -1.
Note:If you are given an array with multiple answers, return the lowest correct index.An empty array should be treated like a 0 in this problem.  

"""

My codes:

def find_even_index(arr):
    for i in range(len(arr)):
        if sum(arr[:i]) == sum(arr[i+1:]):
            return i
    return -1


Others codes:

def find_even_index(arr):
    for i in range(len(arr)):
        if sum(arr[:i]) == sum(arr[i+1:]):
            return i
    return -1


def find_even_index(arr):
    for i in range(len(arr)):
        if sum(arr[:i]) == sum(arr[i+1:]):
            return i
    return -1