code: def load(cls, file_path):
          
          fp = open(file_path)
          json_doc = fp.read()
          fp.close()
          return cls.from_json(json_doc)
docs: Create and return a new Session Token based on the contents
          of a previously saved JSON-format file.
  
          :type file_path: str
          :param file_path: The fully qualified path to the JSON-format
              file containing the previously saved Session Token information.