On 2015年3月14日 22:52:17 -0700 Ethan Furman <[email protected]> wrote:
> I'm not sure exactly how to phrase this inquiry, so please bear with me. > > What exactly does backwards compatibility mean as far as pickle goes? We > have the various protocols, we have the > contents of pickle files created at those protocols, and we have different > versions of Python. > > Should a pickle file created in Python 3.4 with protocol 3 and the contents > of socket.AF_INET be unpicklable with a > Python 3.3 system? Because currently it cannot be as socket.AF_INET became > an IntEnum in 3.4. > > I'm thinking the answer is yes, it should be. I agree with you that this should not break. > So, the final question: Do the contents of a pickle file at a certain > protocol have to be the some between versions, or > is it enough if unpickling them returns the correct object? It's certainly enough if unpickling returns the correct object. Exact serialization is an implementation detail. Regards Antoine. _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com