formatting

diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index 31e7e9141558add42117995aaf1df0f1492888d7..a4587ec50c07d6611a0d9e41ca543241c429e2f9 100644 (file)
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -2131,7 +2131,8 @@ class Mapper(_InspectionAttr):
         while stack:
             item = stack.popleft()
             descendants.append(item)
-            stack.extend(sorted(item._inheriting_mappers, key=lambda m: m.class_.__name__))
+            stack.extend(sorted(item._inheriting_mappers,
+                        key=lambda m: m.class_.__name__))
         return util.WeakSequence(descendants)
 
     def polymorphic_iterator(self):