diff -r 677a9326b4d4 Lib/os.py
--- a/Lib/os.py	Mon Jul 09 18:16:11 2012 -0700
+++ b/Lib/os.py	Mon Jul 16 22:09:10 2012 +0300
@@ -695,6 +695,9 @@
     def copy(self):
         return dict(self)
 
+    def __copy__(self):
+        return self.copy()
+
     def setdefault(self, key, value):
         if key not in self:
             self[key] = value