Whitespace normalization.
diff --git a/Lib/weakref.py b/Lib/weakref.py
index a1fa4e8..6153bd9 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -191,7 +191,7 @@
         except TypeError:
             return 0
         return wr in self.data
-    
+
     def items(self):
         L = []
         for key, value in self.data.items():