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_4 = 0
      for var_5 in var_0 :
          var_4 ^= var_5
      return var_4
  