concurrent.py 文件源码

def set_exc_info(self, exc_info):
        """Sets the exception information of a ``Future.``

        Preserves tracebacks on Python 2.

        .. versionadded:: 4.0
        """
        self._exc_info = exc_info
        self._log_traceback = True
        if not _GC_CYCLE_FINALIZERS:
            self._tb_logger = _TracebackLogger(exc_info)

        try:
            self._set_done()
        finally:
            # Activate the logger after all callbacks have had a
            # chance to call result() or exception().
            if self._log_traceback and self._tb_logger is not None:
                self._tb_logger.activate()
        self._exc_info = exc_info