Split array (not reorder item) in two equal sum. My stupid moment

split_array.py

from random import randint

def split(nums):
    total = sum(nums)
    if total % 2 != 0:
        return False
    half = total // 2
    sub_sum = 0
    for i, num in enumerate(nums):
        sub_sum += num
        if sub_sum == half:
            return nums[:i+1], nums[i+1:]
    return False


def split2(nums):
    left = -1
    left_sum = 0
    right = len(nums)
    right_sum = 0
    while left < right - 1:
        if left_sum < right_sum:
            left += 1
            left_sum += nums[left]
        else:
            right -= 1
            right_sum += nums[right]
    if left_sum == right_sum:
        return nums[:right], nums[right:]
    return False


test_cases = [
    [1,2,3,4,10],
    [10,1,2,3,4],
    [1,2,3,4,5,5],
    [5,5,1,2,3,4],
    [1,2,3,3,2,1],
    [1,2,3,4,3,2,1],
    [1,2,3,4,4,3,2,1],
    [1,2,3,4,5,4,3,2,1]
]

def gen_test_case():
    n = randint(5, 10)
    return [randint(1, 100) for i in range(n)]

for i in range(1000):
    test_cases.append(gen_test_case())

for case in test_cases:
    a = split(case)
    b = split2(case)
    if a != b:
        print(a, b)
        raise 'Failed'
    else:
        print(case, a)

# Benchmark
%timeit for case in test_cases: split(case)
%timeit for case in test_cases: split2(case)