code: def comment_vote(self, comment_id, score):
          
          params = {'score': score}
          return self._get('comments/{0}/votes.json'.format(comment_id), params,
                           method='POST', auth=True)
docs: Lets you vote for a comment (Requires login).
  
          Parameters:
              comment_id (int):
              score (str): Can be: up, down.