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-rw-r--r--mailman/interfaces/database.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/mailman/interfaces/database.py b/mailman/interfaces/database.py
index bf4aaa87c..27ab4bf83 100644
--- a/mailman/interfaces/database.py
+++ b/mailman/interfaces/database.py
@@ -23,6 +23,13 @@ setup.py file as an entry point in the 'mailman.database' group with the name
Mailman's back end.
"""
+__metaclass__ = type
+__all__ = [
+ 'DatabaseError',
+ 'IDatabase',
+ 'SchemaVersionMismatchError',
+ ]
+
from zope.interface import Interface, Attribute
from mailman.interfaces.errors import MailmanError
@@ -38,6 +45,7 @@ class SchemaVersionMismatchError(DatabaseError):
"""The database schema version number did not match what was expected."""
def __init__(self, got):
+ super(SchemaVersionMismatchError, self).__init__()
self._got = got
def __str__(self):