1 files changed, 4 insertions, 6 deletions

diff --git a/src/mailman/model/listmanager.py b/src/mailman/model/listmanager.py
index 074b6b600..0ad29880f 100644
--- a/src/mailman/model/listmanager.py
+++ b/src/mailman/model/listmanager.py
@@ -17,6 +17,7 @@
 
 """A mailing list manager."""
 
+from mailman import public
 from mailman.database.transaction import dbconnection
 from mailman.interfaces.address import InvalidEmailAddressError
 from mailman.interfaces.listmanager import (
@@ -31,11 +32,8 @@ from mailman.utilities.datetime import now
 from zope.event import notify
 from zope.interface import implementer
 
-__all__ = [
-    'ListManager',
-    ]
-
 
+@public
 @implementer(IListManager)
 class ListManager:
     """An implementation of the `IListManager` interface."""
@@ -47,7 +45,7 @@ class ListManager:
         listname, at, hostname = fqdn_listname.partition('@')
         if len(hostname) == 0:
             raise InvalidEmailAddressError(fqdn_listname)
-        list_id = '{0}.{1}'.format(listname, hostname)
+        list_id = '{}.{}'.format(listname, hostname)
         notify(ListCreatingEvent(fqdn_listname))
         mlist = store.query(MailingList).filter_by(_list_id=list_id).first()
         if mlist:
@@ -62,7 +60,7 @@ class ListManager:
     def get(self, store, fqdn_listname):
         """See `IListManager`."""
         listname, at, hostname = fqdn_listname.partition('@')
-        list_id = '{0}.{1}'.format(listname, hostname)
+        list_id = '{}.{}'.format(listname, hostname)
         return store.query(MailingList).filter_by(_list_id=list_id).first()
 
     @dbconnection