gh-105736: Sync pure python version of OrderedDict with the C version (#108098)

1 files changed, 9 insertions, 7 deletions

diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index 03ca2d7..8652dc8 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -95,17 +95,19 @@ class OrderedDict(dict):
     # Individual links are kept alive by the hard reference in self.__map.
     # Those hard references disappear when a key is deleted from an OrderedDict.
 
+    def __new__(cls, /, *args, **kwds):
+        "Create the ordered dict object and set up the underlying structures."
+        self = dict.__new__(cls)
+        self.__hardroot = _Link()
+        self.__root = root = _proxy(self.__hardroot)
+        root.prev = root.next = root
+        self.__map = {}
+        return self
+
     def __init__(self, other=(), /, **kwds):
         '''Initialize an ordered dictionary.  The signature is the same as
         regular dictionaries.  Keyword argument order is preserved.
         '''
-        try:
-            self.__root
-        except AttributeError:
-            self.__hardroot = _Link()
-            self.__root = root = _proxy(self.__hardroot)
-            root.prev = root.next = root
-            self.__map = {}
         self.__update(other, **kwds)
 
     def __setitem__(self, key, value,