workflow.py 文件源码

def last_version_run(self):
        """Return version of last version to run (or ``None``).

        .. versionadded:: 1.9.10

        :returns: :class:`~workflow.update.Version` instance
            or ``None``

        """
        if self._last_version_run is UNSET:

            version = self.settings.get('__workflow_last_version')
            if version:
                from update import Version
                version = Version(version)

            self._last_version_run = version

        self.logger.debug('last run version: %s', self._last_version_run)

        return self._last_version_run