code: def tail(self, n=5):
          
          if self.empty:
              return self
          else:
              if self._length is not None:
                  length = self._length
              else:
                  length = self._lazy_len().weld_expr
  
              # not computing slice here to use with __getitem__ because we'd need to use len which is eager
              return Index(weld_tail(self.weld_expr, length, n),
                           self.dtype,
                           self.name)
docs: Return Index with the last n values.
  
          Parameters
          ----------
          n : int
              Number of values.
  
          Returns
          -------
          Series
              Index containing the last n values.
  
          Examples
          --------
          >>> ind = bl.Index(np.arange(3, dtype=np.float64))
          >>> print(ind.tail(2).evaluate())
          [1. 2.]