class_docstr: A dict like proxy object for accessing information about current user.
code: def __getattr__(self, key: str) -> Optional[str]:
      try:
          return _get_user_info()[key]
      except KeyError:
          raise AttributeError
  
file_path: streamlit/lib/streamlit/user_info.py
imports: from typing import Iterator, Mapping, NoReturn, Optional
  from streamlit.errors import StreamlitAPIException
  from streamlit.runtime.scriptrunner import get_script_run_ctx
  from streamlit.runtime.scriptrunner.script_run_context import UserInfo
label_desc: Use image node_id 2 for calling the UserInfoProxy obj's underlying member method code with example usage: obj.__getattr__(key) and returns: _get_user_info