docs: def _configobj_factory(self,
                             infile,
                             raise_errors=True,
                             list_values=True,
                             file_error=True,
                             interpolation=False,
                             configspec=None,
                             stringify=True,
                             _inspec=False
                             ):
          """
          Factory Method.
          Create Configobj instance and register it to self.config.
          This method also is used to create configspec instance.
          Because configspec instance also is ConfigObj instance.
          """
  
          return configobj.ConfigObj(infile=infile,
                                     raise_errors=raise_errors,
                                     list_values=list_values,
                                     file_error=file_error,
                                     interpolation=interpolation,
                                     configspec=configspec,
                                     stringify=stringify,
                                     _inspec=_inspec
                                     )