comefrom: <doocs>0136.Single Number_1.py
code: def singleNumber( nums: List[int]) -> int:
      res = 0
      for num in nums:
          res ^= num
      return res
masked: def sample_funcname ( var_0 : List [ int ] ) -> int :
      var_1 = 0
      for var_2 in var_0 :
          var_1 ^= var_2
      return var_1
  