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-rw-r--r--mailman/interfaces/chain.py12
1 files changed, 12 insertions, 0 deletions
diff --git a/mailman/interfaces/chain.py b/mailman/interfaces/chain.py
index 2a18d3dea..2685b7980 100644
--- a/mailman/interfaces/chain.py
+++ b/mailman/interfaces/chain.py
@@ -17,6 +17,18 @@
"""Interfaces describing the basics of chains and links."""
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+ 'IChain',
+ 'IChainIterator',
+ 'IChainLink',
+ 'IMutableChain',
+ 'LinkAction',
+ ]
+
+
from munepy import Enum
from zope.interface import Interface, Attribute