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Explain how come that pickle and cPickle, while using the same data 

format, can produce different pickle strings for the same object.
This commit is contained in:
Guido van Rossum 1999-01-06 23:34:39 +00:00
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Doc/lib/libpickle.tex
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@ -294,3 +294,9 @@ subclassed. This should not be an issue in most cases.
The format of the pickle data is identical to that produced using the
\module{pickle} module, so it is possible to use \module{pickle} and
\module{cPickle} interchangably with existing pickles.
(Since the pickle data format is actually a tiny stack-oriented
programming language, and there are some freedoms in the encodings of
certain objects, it's possible that the two modules produce different
pickled data for the same input objects; however they will always be
able to read each others pickles back in.)