diff -r 6b3523f81f42 -r 26744ad37953 cubicweb/dataimport/massive_store.py
--- a/cubicweb/dataimport/massive_store.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/dataimport/massive_store.py	Fri Apr 05 17:58:19 2019 +0200
@@ -22,9 +22,6 @@
 import logging
 from uuid import uuid4
 
-from six import text_type
-from six.moves import range
-
 from cubicweb.dataimport import stores, pgstore
 from cubicweb.server.schema2sql import eschema_sql_def
 
@@ -70,7 +67,7 @@
         """
         super(MassiveObjectStore, self).__init__(cnx)
 
-        self.uuid = text_type(uuid4()).replace('-', '')
+        self.uuid = str(uuid4()).replace('-', '')
         self.slave_mode = slave_mode
         if metagen is None:
             metagen = stores.MetadataGenerator(cnx)