code: def tail(self, n=5):
          
          if self._length is not None:
              length = self._length
          else:
              length = self._lazy_len().weld_expr
  
          return _series_tail(self, self.index.tail(n), length, n)
docs: Return Series with the last n values.
  
          Parameters
          ----------
          n : int
              Number of values.
  
          Returns
          -------
          Series
              Series containing the last n values.
  
          Examples
          --------
          >>> sr = bl.Series(np.arange(3))
          >>> print(sr.tail(2).evaluate())
          <BLANKLINE>
          ---  --
            1   1
            2   2