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-rw-r--r--mailman/interfaces/messages.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/mailman/interfaces/messages.py b/mailman/interfaces/messages.py
index 0da595d0b..72efe960f 100644
--- a/mailman/interfaces/messages.py
+++ b/mailman/interfaces/messages.py
@@ -17,6 +17,15 @@
"""The message storage service."""
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+ 'IMessage',
+ 'IMessageStore',
+ ]
+
+
from zope.interface import Interface, Attribute