code: def unique(self):
          
          return LazyArrayResult(weld_unique(self.values,
                                             self.weld_type),
                                 self.weld_type)
docs: Return unique values in the Series.
  
          Note that because it is hash-based, the result will NOT be in the same order (unlike pandas).
  
          Returns
          -------
          LazyArrayResult
              Unique values in random order.