diff -urN tw2.core-2.2.6.orig/tw2/core/mako_util.py tw2.core-2.2.6/tw2/core/mako_util.py
--- tw2.core-2.2.6.orig/tw2/core/mako_util.py	2019-03-10 21:46:18.000000000 +0100
+++ tw2.core-2.2.6/tw2/core/mako_util.py	2019-08-28 08:46:22.122620780 +0200
@@ -3,7 +3,11 @@
 from copy import copy
 
 from markupsafe import Markup
-from cgi import escape
+try:
+  from cgi import escape
+except ImportError:
+  # python >=3.8
+  from html import escape
 import six
 #from mako.filters import xml_escape