code: def _set(self, remote_or_db, section, opt):
      with self.config.edit(self.args.level) as conf:
          if remote_or_db:
              conf = conf[remote_or_db]
          if self.args.unset:
              self._check(conf, remote_or_db, section, opt)
              del conf[section][opt]
          else:
              conf.update(set_in(conf, [section, opt], self.args.value))
  
      if self.args.name == "cache.type":
          logger.warning(
              "You have changed the 'cache.type' option. This doesn't update"
              " any existing workspace file links, but it can be done with:"
              "\n             dvc checkout --relink"
          )
  
      return 0
  
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 5 for calling the CmdConfig obj's underlying member method code with example usage: obj._set(remote_or_db, section, opt) and returns: int