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Add what's new entry for r73236.

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Antoine Pitrou 2009-06-06 14:21:44 +00:00
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Doc/whatsnew/3.1.rst
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@ -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
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