docs: def load(cls, path):
          """
          load DictTree from json files.
          """
          try:
              with open(path, "rb") as f:
                  return cls(__data__=json.loads(f.read().decode("utf-8")))
          except:
              pass
  
          with open(path, "rb") as f:
              return cls(__data__=pickle.load(f))