comefrom: <qiyuangong>136_Single_Number_1.py
code: def singleNumber( nums):
      dic = {}
      for num in nums:
          try:
              dic[num] += 1
          except KeyError:
              dic[num] = 1
      for num in nums:
          if dic[num] == 1:
              return num
masked: def sample_funcname ( var_0 ) :
      var_1 = { }
      for var_2 in var_0 :
          try :
              var_1 [ var_2 ] += 1
          except KeyError :
              var_1 [ var_2 ] = 1
      for var_2 in var_0 :
          if var_1 [ var_2 ] == 1 :
              return var_2
  