[SciPy-user] rescuing old pickled numpy arrays

Cory Davis cdavis at staffmail.ed.ac.uk
Tue Jun 20 05:56:39 CDT 2006

Thanks for the advice David,
here is an example pickle that produces the error below.  I think its 
just a dictionary with some arrays.

David M. Cooke wrote:
> On Mon, Jun 19, 2006 at 02:51:36PM +0100, Cory Davis wrote:
>>Hi All,
>>this relates to a question I raised a few weeks ago about pickled arrays 
>>from older Numpy versions not loading.  Here is what happens when I try 
>>to load my old data ...
>>---> 51     return cPickle.load(infile)
>>AttributeError: 'module' object has no attribute 'dtypedescr'
>>Can anyone suggest an easy way to rescue this data?
> The easy way I suppose would be to inject a 'dtypedescr' into the
> appropiate module.
> Have a look at the pickletools module. pickletools.dis() will
> disassemble the pickle, so you could figure out what it's looking for.
> At worst, you could use pickletools.genops() to pull out the data.
> Can you send me a copy of a pickle? I may be able to cook up an upgrade
> routine.
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