code: def _process_file_continue_ftp_response(self, response: FTPResponse):
          '''Process a restarted content response.'''
          if response.request.restart_value and response.restart_value:
              self.open_file(self._filename, response, mode='ab+')
          else:
              self._raise_cannot_continue_error(f _process_file_continue_ftp_response(self, response: FTPResponse):
          '''Process a restarted content response.'''
          if response.request.restart_value and response.restart_value:
              self.open_file(self._filename, response, mode='ab+')
          else:
              self._raise_cannot_continue_error()
docs: Process a restarted content response.