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-rw-r--r--slixmpp/stanza/roster.py3
1 files changed, 1 insertions, 2 deletions
diff --git a/slixmpp/stanza/roster.py b/slixmpp/stanza/roster.py
index f846d595..11d38cc2 100644
--- a/slixmpp/stanza/roster.py
+++ b/slixmpp/stanza/roster.py
@@ -118,8 +118,7 @@ class RosterItem(ElementBase):
namespace = 'jabber:iq:roster'
name = 'item'
plugin_attrib = 'item'
- interfaces = set(('jid', 'name', 'subscription', 'ask',
- 'approved', 'groups'))
+ interfaces = {'jid', 'name', 'subscription', 'ask', 'approved', 'groups'}
def get_jid(self):
return JID(self._get_attr('jid', ''))