code: def gen_lines_from_textfiles(
          files: Iterable[TextIO]) -> Generator[str, None, None]:
      
      for file in files:
          for line in file:
              yield line
docs: Generates lines from file-like objects.
  
      Args:
          files: iterable of :class:`TextIO` objects
  
      Yields:
          each line of all the files