cache.py 文件源码

def update_keys(self, keys):
        """ Add new IDs to cache.

            :param list keys: list of new IDs to be added to cache
            :return: self
            :rtype: ObjectCache
        """
        if not self:
            # for large amounts of data, this may be faster (no need for set
            # and difference calls)
            self.update({cid: {'id': cid} for cid in keys})
        else:
            self.update({cid: {'id': cid}
                         for cid in set(keys).difference(six.viewkeys(self))})
        return self