code: def __iadd__(
      self, line_or_lines: typing.Union[str, typing.List[str]]
  ) -> "IndentedLines":
      if isinstance(line_or_lines, list):
          self.add_lines(line_or_lines)
      else:
          self.add_line(line_or_lines)
      return self
  
imports: import os
  import re
  import typing
  from dataclasses import dataclass, field
  from shutil import copy, rmtree
  import swagger_parser
  from typing_extensions import Literal, assert_never
label_desc: Use image node_id 8 for calling the IndentedLines obj's underlying member method code with example usage: obj.__iadd__(line_or_lines) and returns: self