class Solution(object):
    def findNumsAppearOnce(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        eor = 0
        for x in nums:
            eor ^= x
        # 比如00001000
        rightOne = eor & (~eor + 1)
        eor2 = 0
        for x in nums:
            #说明有1
            if x & rightOne != 0:
                eor2 ^= x
        return (eor2, eor ^ eor2)