Move initialization of root link to __init__.

diff --git a/Lib/collections.py b/Lib/collections.py
index 2c2355ee1e8b9580cbdc918c7572273c0fa6ba83..f0f1fbbe29030e5b2ad352d8b6e6f58ccceedaf8 100644 (file)
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -41,11 +41,12 @@ class OrderedDict(dict, MutableMapping):
         try:
             self.__root
         except AttributeError:
+            self.__root = _Link()       # sentinel node for the doubly linked list
             self.clear()
         self.update(*args, **kwds)
 
     def clear(self):
-        self.__root = root = _Link()    # sentinel node for the doubly linked list
+        root = self.__root
         root.prev = root.next = root
         self.__map = {}
         dict.clear(self)