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

[Guido van Rossum]

On Thu, Mar 15, 2012 at 9:48 PM, Tres Seaver <tseaver at palladion.com> wrote:
> 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

Don't I know it. :-)

So do you need any help porting to Python 3 or not? The OP didn't mention Zope.

-- 
--Guido van Rossum (python.org/~guido)