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[Python-Dev] Unpickling py2 str as py3 bytes (and vice versa)

[Python-Dev] Unpickling py2 str as py3 bytes (and vice versa) - implementation (issue #6784)

Tres Seaver tseaver at palladion.com
Fri Mar 16 05:48:18 CET 2012 
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On 03/13/2012 06:49 PM, Nick Coghlan wrote:
> On Wed, Mar 14, 2012 at 8:08 AM, Guido van Rossum <guido at python.org>
> wrote:
>> If you can solve your problem with a suitably hacked Unpickler 
>> subclass that's fine with me, but I would personally use this 
>> opportunity to change the app to some other serialization format
>> that is perhaps less general but more robust than pickle. I've been
>> bitten by too many pickle-related problems to recommend pickle to
>> anyone...
> 
> It's fine for in-memory storage of (almost) arbitrary objects (I use 
> it to stash things in a memory backed sqlite DB via SQLAlchemy) and 
> for IPC, but yeah, for long-term cross-version persistent storage,
> I'd be looking to something like JSON rather than pickle.

Note the Zope ecosystem (including Plone) is an *enoromous* installed
base[1] using pickle for storage of data over many years and multiple
versions of Python:  until this point, it has always been possible to
arrange for old pickles to work (e.g., by providing aliases for missing
module names, etc.).

]1] tens of thousands of Zope-based sites in production, including very
    high-profile ones:  http://plone.org/support/sites




Tres.
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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