1 files changed, 7 insertions, 8 deletions
diff --git a/slixmpp/stanza/presence.py b/slixmpp/stanza/presence.py
index 517e73c1..614cd331 100644
--- a/slixmpp/stanza/presence.py
+++ b/slixmpp/stanza/presence.py
@@ -56,14 +56,13 @@ class Presence(RootStanza):
     name = 'presence'
     namespace = 'jabber:client'
     plugin_attrib = name
-    interfaces = set(['type', 'to', 'from', 'id', 'show',
-                      'status', 'priority'])
-    sub_interfaces = set(['show', 'status', 'priority'])
-    lang_interfaces = set(['status'])
-
-    types = set(['available', 'unavailable', 'error', 'probe', 'subscribe',
-                 'subscribed', 'unsubscribe', 'unsubscribed'])
-    showtypes = set(['dnd', 'chat', 'xa', 'away'])
+    interfaces = {'type', 'to', 'from', 'id', 'show', 'status', 'priority'}
+    sub_interfaces = {'show', 'status', 'priority'}
+    lang_interfaces = {'status'}
+
+    types = {'available', 'unavailable', 'error', 'probe', 'subscribe',
+             'subscribed', 'unsubscribe', 'unsubscribed'}
+    showtypes = {'dnd', 'chat', 'xa', 'away'}
 
     def __init__(self, *args, **kwargs):
         """