not_so_naive.py

class Solution:
    def twoSum(self, nums, target):
        """
        :type nums: List[int]
        :type target: int
        :rtype: List[int]
        """
        value_to_index = {}
        idx = 0
        for num in nums:
            value_to_index[num] = idx
            idx += 1
        for num in nums:
            try:
                complement_idx = value_to_index[target - num]
                current_idx = value_to_index[num]
                if complement_idx != current_idx:
                    return [current_idx, complement_idx]
            except:
                pass