code: def __init__(
      self,
      config: dict,
      root_dir: Optional[_Path] = None,
      ignore_option_errors: bool = False,
      dist: Optional["Distribution"] = None,
  ):
      self.config = config
      self.root_dir = root_dir or os.getcwd()
      self.project_cfg = config.get("project", {})
      self.dynamic = self.project_cfg.get("dynamic", [])
      self.setuptools_cfg = config.get("tool", {}).get("setuptools", {})
      self.dynamic_cfg = self.setuptools_cfg.get("dynamic", {})
      self.ignore_option_errors = ignore_option_errors
      self._dist = dist
      self._referenced_files: Set[str] = set()
  
imports: import logging
  import os
  from contextlib import contextmanager
  from functools import partial
  from typing import TYPE_CHECKING, Callable, Dict, Mapping, Optional, Set, Union
  from ..errors import FileError, InvalidConfigError
  from ..warnings import SetuptoolsWarning
  from .None import expand
  from ._apply_pyprojecttoml import _PREVIOUSLY_DEFINED, _MissingDynamic
  from ._apply_pyprojecttoml import apply
label_desc: Use image node_id 1 to create a new _ConfigExpander object  with example: obj = _ConfigExpander(config, root_dir, ignore_option_errors, dist)