def twoSum(self, nums, target):
    hash_map = dict()
    for (i, x) in enumerate(nums):
        if ((target - x) in hash_map):
            return [i, hash_map[(target - x)]]
        hash_map[x] = i
def twoSum(self, nums, target):
    hash_map = dict()
    for (i, x) in enumerate(nums):
        if ((target - x) in hash_map):
            return [i, hash_map[(target - x)]]
        hash_map[x] = i