code: def __iter__(self) -> Iterator[str]:
      return iter(self._keys)
  
file_path: DeepPavlov/deeppavlov/configs/__init__.py
imports: from pathlib import Path
  from typing import Iterator, Dict, Union, Iterable
label_desc: Use image node_id 1 for calling the Struct obj's underlying member method code with example usage: obj.__iter__() and returns: iter