class_docstr: We use AttrDict to wrap up dictionary values from secrets
  to provide dot access to nested secrets
class_docstr_tok: ["We","use","AttrDict","to","wrap","up","dictionary","values","from","secrets","to","provide","dot","access","to","nested","secrets"]
code: def __iter__(self) -> Iterator[str]:
      return iter(self.__nested_secrets__)
  
imports: import os
  import threading
  from copy import deepcopy
  from typing import Any, Dict, ItemsView, Iterator, KeysView, List, Mapping, NoReturn, Optional, ValuesView
  import toml
  from blinker import Signal
  from typing_extensions import Final
  import streamlit
  import streamlit.watcher.path_watcher
  from streamlit import file_util, runtime
  from streamlit.logger import get_logger
label_desc: Use image node_id 4 for calling the AttrDict obj's underlying member method code with example usage: obj.__iter__() and returns: iter