[issue11286] Some "trivial" python 2.x pickles fails to load in Python 3.2
Alexander Belopolsky
report at bugs.python.org
Wed Feb 23 16:35:25 CET 2011
Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:
On Wed, Feb 23, 2011 at 10:22 AM, Antoine Pitrou <report at bugs.python.org> wrote:
..
> Well, a theoretical argument could be made that some codec could return
> a non-empty string when asked to decode an empty bytestring, but I'm not
> sure it has much practical worth :)
I was thinking about that as well. Note that the opposite is quite
common, for example any encoding that uses BOM will turn empty unicode
string into a non-empty byte string. I don't think a codec that
decodes b'' into non-empty string exists, but it would be reasonable
for a codec that requires BOM or some other metadata to reject raise
an error on b''. If we rely on decode(b'') == '', these errors will
go unnoticed. I am going to prepare a Unpickler_Read() patch with
tests and play with it a little. It is a good idea to separate
performance optimizations from bug fixes anyways. If we want to
bypass decode on empty strings, we can do it independently.
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