twoSum = py

class Solution:

    def __init__(self):
        self.flag = True

    def two_sum(self, nums: List[int], target: int) -> List[int]:
        result = []
        ndx = {}
        for i in range(len(nums)):
            x = target - nums[i]
            n = ndx.get(x)
            if n != None:
                result = [n, i]
                break
            ndx[nums[i]] = i
        return result