Use multi-line import
diff --git a/Lib/weakref.py b/Lib/weakref.py
index 77a41b1..c0669b0 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -11,14 +11,14 @@
 
 import UserDict
 
-from _weakref import \
-     getweakrefcount, \
-     getweakrefs, \
-     ref, \
-     proxy, \
-     CallableProxyType, \
-     ProxyType, \
-     ReferenceType
+from _weakref import (
+     getweakrefcount,
+     getweakrefs,
+     ref,
+     proxy,
+     CallableProxyType,
+     ProxyType,
+     ReferenceType)
 
 from exceptions import ReferenceError