code: def _check_version(self, config):
          
          try:
              self.file_version = config.get(
                  escape_for_ini('keyring-setting'),
                  escape_for_ini('version'),
              )
          except (configparser.NoSectionError, configparser.NoOptionError):
              return False
          return True
docs: check for a valid version
          an existing scheme implies an existing version as well
  
          return True, if version is valid, and False otherwise