code: def atlas_rank_peers_by_health( peer_list=None, peer_table=None, with_zero_requests=False, with_rank=False ):
      
  
      with AtlasPeerTableLocked(peer_table) as ptbl:
          if peer_list is None:
              peer_list = ptbl.keys()[:]
  
          peer_health_ranking = []    # (health score, peer hostport)
          for peer_hostport in peer_list:
              reqcount = atlas_peer_get_request_count( peer_hostport, peer_table=ptbl )
              if reqcount == 0 and not with_zero_requests:
                  continue
  
              health_score = atlas_peer_get_health( peer_hostport, peer_table=ptbl)
              peer_health_ranking.append( (health_score, peer_hostport) )
      
      # sort on health
      peer_health_ranking.sort()
      peer_health_ranking.reverse()
  
      if not with_rank:
          return [peer_hp for _, peer_hp in peer_health_ranking]
      else:
          # include the score.
          return peer_health_ranking
docs: Get a ranking of peers to contact for a zonefile.
      Peers are ranked by health (i.e. response ratio).
  
      Optionally include peers we haven't talked to yet (@with_zero_requests)
      Optionally return [(health, peer)] list instead of just [peer] list (@with_rank)