code: def drop_right(self, n):
          
          return self._transform(transformations.CACHE_T, transformations.drop_right_t(n))
docs: Drops the last n elements of the sequence.
  
          >>> seq([1, 2, 3, 4, 5]).drop_right(2)
          [1, 2, 3]
  
          :param n: number of elements to drop
          :return: sequence with last n elements dropped