--- python/samba/ms_schema.py.orig  2018-03-15 15:23:25.000000000 +0300
+++ python/samba/ms_schema.py 2018-03-15 15:23:31.000000000 +0300
@@ -277,7 +277,7 @@
 
     header.append(["objectGUID", str(uuid.uuid4()), False])
 
-    entry = header + [x for x in entry if x[0].lower() not in {'dn', 'changetype', 'objectcategory'}]
+    entry = header + [x for x in entry if x[0].lower() not in ['dn', 'changetype', 'objectcategory']]
 
     return entry