code: def _get_appropriate_levels(self, levels):
      if levels:
          self._validate_level_for_non_repo_operation(levels)
          return [levels]
      if self.config.dvc_dir is None:
          return self.config.SYSTEM_LEVELS
      return self.config.LEVELS
  
imports: import argparse
  import os
  from funcy import set_in
  from dvc.cli import formatter
  from dvc.cli.command import CmdBaseNoRepo
  from dvc.cli.utils import append_doc_link
  from dvc.log import logger
  from dvc.ui import ui
label_desc: Use image node_id 7 for calling the CmdConfig obj's underlying member method code with example usage: obj._get_appropriate_levels(levels) and returns: self, list, self