docstr: auto generate default config file, and stage it into the profile.
code: def stage_default_config_file(self):
      """auto generate default config file, and stage it into the profile."""
      s = self.generate_config_file()
      fname = os.path.join(
          self.profile_dir.location, self.config_file_name
      )
      if self.overwrite or not os.path.exists(fname):
          self.log.warning(
              "Generating default config file: %r" % (fname)
          )
          with open(fname, "w") as f:
              f.write(s)
  
imports: import atexit
  from copy import deepcopy
  import glob
  import logging
  import os
  import shutil
  import sys
  from traitlets.config.application import Application, catch_config_error
  from traitlets.config.loader import ConfigFileNotFound, PyFileConfigLoader
  from IPython.core import release, crashhandler
  from IPython.core.profiledir import ProfileDir, ProfileDirError
  from IPython.paths import get_ipython_dir, get_ipython_package_dir
  from IPython.utils.path import ensure_dir_exists
  from IPython.utils import py3compat
  from traitlets import List, Unicode, Type, Bool, Dict, Set, Instance, Undefined, default, observe
label_desc: Use image node_id 17 for calling the BaseIPythonApplication obj's underlying member method code with example usage: obj.stage_default_config_file() without return types