diff -r 6b3523f81f42 -r 26744ad37953 cubicweb/cwvreg.py
--- a/cubicweb/cwvreg.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/cwvreg.py	Fri Apr 05 17:58:19 2019 +0200
@@ -24,8 +24,6 @@
 from datetime import datetime, date, time, timedelta
 from functools import reduce
 
-from six import text_type, binary_type
-
 from logilab.common.decorators import cached, clear_cache
 from logilab.common.deprecation import class_deprecated
 from logilab.common.modutils import clean_sys_modules
@@ -218,9 +216,9 @@
         """
         obj = self.select(oid, req, rset=rset, **kwargs)
         res = obj.render(**kwargs)
-        if isinstance(res, text_type):
+        if isinstance(res, str):
             return res.encode(req.encoding)
-        assert isinstance(res, binary_type)
+        assert isinstance(res, bytes)
         return res
 
     def possible_views(self, req, rset=None, **kwargs):