[Python-Dev] Cloning threading.py using proccesses (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Sun Oct 15 14:59:57 CEST 2006

Fredrik Lundh schrieb:

but given that the format has been stable for many years, surely it would make more sense to just codify that fact, rather than developing Yet Another Serialization Format instead?

There have been minor changes over time, e.g. r26146 (gvanrossum) introduced TYPE_TRUE and TYPE_FALSE, r36242 (loewis) introduced TYPE_INTERNED and TYPE_STRINGREF, and r38266 (rhettinger) introduced TYPE_SET and TYPE_FROZENSET.

With these changes, old dumps can load in new versions, but not vice versa.

Furthermore, r27219 (nnorwitz) changed the co_argcount, co_nlocals, co_stacksize, co_flags, and co_firstlineno fields from short to long; unmarshalling from an old version would just crash/read garbage.

So how would you propose to deal with such changes in the future?

Regards, Martin

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