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bpo-38388: Document pickle protocol version 5 (GH-16639) 

(cherry picked from commit d0e0f5bf0c)

Co-authored-by: Dima Tisnek <dimaqq@gmail.com>
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Miss Skeleton (bot) 2019-11-03 04:03:16 -08:00 committed by GitHub
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Doc/library/pickle.rst
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@ -136,7 +136,7 @@ The module :mod:`pickletools` contains tools for analyzing data streams
generated by :mod:`pickle`. :mod:`pickletools` source code has extensive
comments about opcodes used by pickle protocols.
There are currently 5 different protocols which can be used for pickling.
There are currently 6 different protocols which can be used for pickling.
The higher the protocol used, the more recent the version of Python needed
to read the pickle produced.
@ -160,6 +160,10 @@ to read the pickle produced.
Refer to :pep:`3154` for information about improvements brought by
protocol 4.
* Protocol version 5 was added in Python 3.8. It adds support for out-of-band
data and speedup for in-band data. Refer to :pep:`574` for information about
improvements brought by protocol 5.
.. note::
Serialization is a more primitive notion than persistence; although
:mod:`pickle` reads and writes file objects, it does not handle the issue of