[Python-3000] pickle compatibility between 2.x and 3.0

Facundo Batista facundobatista at gmail.com
Thu Nov 1 17:50:57 CET 2007

2007/11/1, Guido van Rossum <guido at python.org>:

> I could leave this all up to the 3.0 application, which would have to
> "fix up" any bytes in the pickle it receives explicitly if it wants
> to. Alternatively, I could add an encoding option to the pickle
> loading APIs (and for full flexibility an errors option as well) so
> that at least simple text-based applications might have a chance of
> reading the data that they themselves wrote before they were ported to
> 3.0 with minimal changes (only the unpickling calls would have to be
> modified).

I think that to make possible to the unpickling appl to specify which
encoding to use is the best option here, so to avoid:

- Need to change the appl that created the pickle (that can be not accesible).

- Have to make the work by hand of dealing with that "fix up" everywhere.

- Requests from developers to add a "magic guess" to discover
automatically which encoding use.


.    Facundo

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