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bpo-22005: Document the reality of pickle compatibility. (GH-11054) 

(cherry picked from commit e328753d91)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Miss Islington (bot) 2018-12-09 11:48:35 -08:00 committed by GitHub
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Doc/library/pickle.rst
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@ -71,7 +71,9 @@ The :mod:`pickle` module differs from :mod:`marshal` in several significant ways
:file:`.pyc` files, the Python implementers reserve the right to change the
serialization format in non-backwards compatible ways should the need arise.
The :mod:`pickle` serialization format is guaranteed to be backwards compatible
across Python releases.
across Python releases provided a compatible pickle protocol is chosen and
pickling and unpickling code deals with Python 2 to Python 3 type differences
if your data is crossing that unique breaking change language boundary.
Comparison with ``json``
^^^^^^^^^^^^^^^^^^^^^^^^