[Python-checkins] r73254 - python/branches/py3k/Doc/whatsnew/3.1.rst

[antoine.pitrou]

Author: antoine.pitrou
Date: Sat Jun  6 16:21:44 2009
New Revision: 73254

Log:
Add what's new entry for r73236.



Modified:
   python/branches/py3k/Doc/whatsnew/3.1.rst

Modified: python/branches/py3k/Doc/whatsnew/3.1.rst
==============================================================================
--- python/branches/py3k/Doc/whatsnew/3.1.rst	(original)
+++ python/branches/py3k/Doc/whatsnew/3.1.rst	Sat Jun  6 16:21:44 2009
@@ -384,6 +384,24 @@
 
   (Contributed by Brett Cannon.)
 
+* :mod:`pickle` is now more compatible with Python 2.x when using a
+  2.x-compatible protocol (that is, protocol 2 or lower), through translation
+  of some standard library module names to or from their Python 2.x
+  equivalents.
+
+  This means that more (protocol 2 or lower) pickles produced by Python 3.1
+  will be reusable by Python 2.x, and vice-versa. Standard set objects are
+  an example of this improvement.
+
+  This has the (unfortunate but unavoidable) side effect that some
+  protocol 2 pickles produced by Python 3.1 won't be readable with
+  Python 3.0. The latest pickle protocol, protocol 3, should be used when
+  migrating data between Python 3.x implementations, as it doesn't attempt
+  to remain compatible with Python 2.x.
+
+  (Contributed by Alexandre Vassalotti and Antoine Pitrou, :issue:`6137`.)
+
+
 Optimizations
 =============