code: def check(cls):
          
          attribs = [
              'app_version',
              'app_name',
              'config_file_path',
              'config_sep_str',
          ]
          for attrib in attribs:
              if getattr(cls, attrib) == 'not_set':
                  raise IncompleteSetupError(f'elib_config setup is incomplete; missing: {attrib}')
docs: Verifies that all necessary values for the package to be used have been provided
  
          :raises: `elib_config._exc.IncompleteSetupError`