code: def reset(self):
      
      # Populate loaded_values with values from --config-file, if it was given.
      self._loaded_values = {}
      if self._flags.config_file is not None:
        self.load_from_file(self._flags.config_file, _allow_undeclared=True)
docs: Reset the loaded state of the configuration to what it was at import.
  
      Note that this does *not* reset values set by commandline flags or loaded
      from --config-file (in fact, any values loaded from --config-file that have
      been overridden are reset to their value from --config-file).