code: def getKnownLadders(reset=False):
      
      if not ladderCache or reset:
          jsonFiles = os.path.join(c.LADDER_FOLDER, "*.json")
          for ladderFilepath in glob.glob(jsonFiles):
              filename = os.path.basename(ladderFilepath)
              name = re.search("^ladder_(.*?).json$", filename).groups()[0]
              ladder = Ladder(name)
              ladderCache[ladder.name] = ladder
      return ladderCache
docs: identify all of the currently defined ladders