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-rw-r--r--mailman/interfaces/pipeline.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/mailman/interfaces/pipeline.py b/mailman/interfaces/pipeline.py
index a95fb7628..0268693b7 100644
--- a/mailman/interfaces/pipeline.py
+++ b/mailman/interfaces/pipeline.py
@@ -17,6 +17,14 @@
"""Interface for describing pipelines."""
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+ 'IPipeline',
+ ]
+
+
from zope.interface import Interface, Attribute