1 files changed, 7 insertions, 6 deletions
diff --git a/slixmpp/features/feature_mechanisms/stanza/failure.py b/slixmpp/features/feature_mechanisms/stanza/failure.py
index cc0ac877..adc686b7 100644
--- a/slixmpp/features/feature_mechanisms/stanza/failure.py
+++ b/slixmpp/features/feature_mechanisms/stanza/failure.py
@@ -16,13 +16,14 @@ class Failure(StanzaBase):
 
     name = 'failure'
     namespace = 'urn:ietf:params:xml:ns:xmpp-sasl'
-    interfaces = set(('condition', 'text'))
+    interfaces = {'condition', 'text'}
     plugin_attrib = name
-    sub_interfaces = set(('text',))
-    conditions = set(('aborted', 'account-disabled', 'credentials-expired',
-        'encryption-required', 'incorrect-encoding', 'invalid-authzid',
-        'invalid-mechanism', 'malformed-request', 'mechansism-too-weak',
-        'not-authorized', 'temporary-auth-failure'))
+    sub_interfaces = {'text'}
+    conditions = {'aborted', 'account-disabled', 'credentials-expired',
+                  'encryption-required', 'incorrect-encoding',
+                  'invalid-authzid', 'invalid-mechanism', 'malformed-request',
+                  'mechansism-too-weak', 'not-authorized',
+                  'temporary-auth-failure'}
 
     def setup(self, xml=None):
         """