[Python-Dev] Pickle format machine independence (original) (raw)
Guido van Rossum guido at python.org
Mon Apr 14 19:59:51 CEST 2008
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On Mon, Apr 14, 2008 at 6:56 AM, Hrvoje Nikšić <hrvoje.niksic at avl.com> wrote:
Are pickle files intended to be readable across different machine architectures? The documentation states unequivocally that they are compatible across Python versions, but compatibility across machine architectures (wrt to differences in size and layout of primitive C types) is not explicitly addressed.
They're supposed to be compatible across all architectures.
One example where I stumbled upon the incompatibility is the pickling of arrays. While pickle is normally very careful to write out numbers in a platform-independent way, arrays are written out in "tostring" format. This is filed under http://bugs.python.org/issue2389.
I can work around this issue in my application, but if this is considered a bug, I'd prefer to fix it in Python instead.
It may not be easy to fix this in a backwards-compatible way, but I agree that there's something fishy there. If you can think of a fix, please do submit a patch!
-- --Guido van Rossum (home page: http://www.python.org/~guido/)
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