reuse NoneType

diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index 1a7e90644ad336b9f4518fe27f01cc51d6d2ca98..692e63347bb2f15879c102798868624376164c72 100644 (file)
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -1022,6 +1022,6 @@ type_map = {
     dt.datetime : DateTime,
     dt.time : Time,
     dt.timedelta : Interval,
-    type(None): NullType
+    NoneType: NullType
 }