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

[Georg Brandl]

Alexandre Vassalotti schrieb:
> On 11/1/07, Guido van Rossum <guido at python.org> wrote:
>> When 3.0 encounters a 'str' object in a pickle written by 2.x, it has
>> two choices: trying to convert it to a 3.0 (unicode) str object by
>> applying some encoding, or interpreting it as a 3.0 bytes object.
> 
> Currently, pickle decodes old string objects using latin-1. To me,
> these seems to be a reasonable default (IMHO,
> sys.getfilesystemencoding() would be slightly better). However, having
> a default encoding might hide decoding errors. So, it may be a better
> idea to simply return bytes by default and leave it to the application
> to specify the encoding in the unpickling call.

+1 for that. If no encoding is given, return bytes; if encoding (and
possibly an errors argument) is given, return Unicode.

Georg

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