code: def _obtain_classifiers(self, dist: "Distribution"):
      if "classifiers" in self.dynamic:
          value = self._obtain(dist, "classifiers", {})
          if value:
              return value.splitlines()
      return None
  
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 16 for calling the _ConfigExpander obj's underlying member method code with example usage: obj._obtain_classifiers(dist) and returns: None, value