class_docstr: WSGI error stream as defined in PEP 3333
code: def flush(self) -> object:
      ...
  
imports: from collections.abc import Callable, Iterable, Iterator
  from types import TracebackType
  from typing import Any, Protocol, TypeAlias
label_desc: Use image node_id 1 for calling the ErrorStream obj's underlying member method code with example usage: obj.flush() without return types