Two TwoSum implementations

two_sum.py

# x + y = target
def twoSum(array, targetSum):
    seen = {}
    for index, x in enumerate(array):
        y = targetSum - x
        if y in seen:
            return [x, y]
        else:
            seen[x] = index
    return []

# worse
def twoNumberSum_2(array, targetSum):
    for (index_1, item_1) in enumerate(array):
        for (_, item_2) in enumerate(array[index_1 + 1:]):
            if item_1 + item_2 == targetSum:
                return [item_1, item_2]
    return []