code: def _canonic_package_data(self, field="package-data"):
      package_data = self.setuptools_cfg.get(field, {})
      return _expand.canonic_package_data(package_data)
  
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 4 for calling the _ConfigExpander obj's underlying member method code with example usage: obj._canonic_package_data(field) and returns: _expand