code

class Solution(object):
def twoSum(self, nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: List[int]
"""
required = {}
for i in range(len(nums)):
if target - nums[i] in required:
return [required[target - nums[i]],i]
else:
required[nums[i]]=i
input_list = [2,8,12,15]
ob1 = Solution()
print(ob1.twoSum(input_list, 20))