new_contents: class Solution(object):
      def twoSum(self, nums, target):
          """
          :type nums: List[int]
          :type target: int
          :rtype: List[int]
          """
          lookup = {}
          for i, num in enumerate(nums):
              if (target - num) in lookup:
                  return [lookup[target - num], i]
              lookup[num] = i
          return []
          
  
subject: Create two_sum.py