code: def update(self, score_vals):
          '''Update the :class:`zset` with an iterable over pairs of
  scores and values.'''
          add = self.add
          for score, value in score_vals:
              add(score, valuef update(self, score_vals):
          '''Update the :class:`zset` with an iterable over pairs of
  scores and values.'''
          add = self.add
          for score, value in score_vals:
              add(score, value)
docs: Update the :class:`zset` with an iterable over pairs of
  scores and values.