diff -r deb421baf671 Lib/urllib/error.py
--- a/Lib/urllib/error.py	Sat Jul 28 21:59:05 2012 +0200
+++ b/Lib/urllib/error.py	Sat Jul 28 22:49:13 2012 -0400
@@ -27,8 +27,12 @@
     # subclasses, but args doesn't have the typical format with errno in
     # slot 0 and strerror in slot 1.  This may be better than nothing.
     def __init__(self, reason, filename=None):
-        self.args = reason,
+        self.args = (reason,)
         self.reason = reason
+        if hasattr(reason, "errno"):
+            self.errno = reason.errno
+        if hasattr(reason, "strerror"):
+            self.strerror = reason.strerror
         if filename is not None:
             self.filename = filename