How to use the pymemcache.client.MemcacheError function in pymemcache

except pymemcache_client.MemcacheUnexpectedCloseError as e:
        utils.raise_with_cause(coordination.ToozConnectionError,
                               encodeutils.exception_to_unicode(e),
                               cause=e)
    except (socket.timeout, socket.error,
            socket.gaierror, socket.herror) as e:
        # TODO(harlowja): get upstream pymemcache to produce a better
        # exception for these, using socket (vs. a memcache specific
        # error) seems sorta not right and/or the best approach...
        msg = encodeutils.exception_to_unicode(e)
        if e.errno is not None:
            msg += " (with errno %s [%s])" % (errno.errorcode[e.errno],
                                              e.errno)
        utils.raise_with_cause(coordination.ToozConnectionError,
                               msg, cause=e)
    except pymemcache_client.MemcacheError as e:
        utils.raise_with_cause(tooz.ToozError,
                               encodeutils.exception_to_unicode(e),
                               cause=e)