链接：136. 只出现一次的数字 - 力扣（LeetCode）

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 1 class Solution(object):
 2     def singleNumber(self, nums):
 3         """
 4         :type nums: List[int]
 5         :rtype: int
 6         """
 7         length = len(nums)
 8         i = 0
 9         res = 0
10         while i < length:
11             res = res ^ nums[i]
12             i += 1
13         return res