From 3bbbf18a38ad2af62a090692acb6f1299baf9aba Mon Sep 17 00:00:00 2001 From: Antoine Pitrou Date: Sat, 6 Jun 2009 14:21:44 +0000 Subject: Add what's new entry for r73236. --- Doc/whatsnew/3.1.rst | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Doc/whatsnew/3.1.rst b/Doc/whatsnew/3.1.rst index 1891038..e560bcd 100644 --- a/Doc/whatsnew/3.1.rst +++ b/Doc/whatsnew/3.1.rst @@ -384,6 +384,24 @@ New, Improved, and Deprecated Modules (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 ============= -- cgit v0.12