260. Single Number III - LeetCode Solution

class Solution:
    def singleNumber(self, nums: List[int]) -> List[int]:
        
        d = {}
        
        for i in nums:
            if i in d:
                d[i]+= 1
            else:
                d[i] = 1
        
        s = []
        
        for i in d:
            if d[i] ==1:
                s.append(i)
        
        return s