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Fri Mar 6 12:45:38 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/086836.html

Michael Haggerty <mhagger <at> alum.mit.edu> writes:
> 
> It is easy to optimize the pickling of instances by giving them
> __getstate__() and __setstate__() methods.  But the pickler still
> records the type of each object (essentially, the name of its class) in
> each record.  The space for these strings constituted a large fraction
> of the database size.

If these strings are not interned, then perhaps they should be.
There is a similar optimization proposal (w/ patch) for attribute names:
http://bugs.python.org/issue5084

Regards

Antoine.

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[Python-Dev] Pickler/Unpickler API clarification