[Numpy-discussion] Re: Dumping record arrays

Travis Oliphant oliphant.travis at ieee.org
Sat Apr 22 10:19:00 CDT 2006


Jordi Bofill wrote:
> Pierre GM wrote:
>
>   
>> Folks,
>> I'd like to dump/pickle some record arrays. The pickling works, the
>> unpickling raises a ValueError (on my version of numpy 0.9.6). (cf below).
>> Is this already corrected in the svn version ?
>> Thx
>>
>>
>>
>>     
> ###########################################################################
>   
>> #
>>
>> x1 = array([21,32,14])
>> x2 = array(['my','first','name'])
>> x3 = array([3.1, 4.5, 6.2])
>> r = rec.fromarrays([x1,x2,x3], names='id, word, number')
>>
>>     
This is fixed in SVN (but you have to get more than just the SVN 
records.py script).   The needed change is in the __reduce__ method of 
the array object (which is in C).  A re-compile is needed. 

NumPy 0.9.8 should be out in a few weeks.

Best,

-Travis


>> r.dump('dumper')
>> rb=load('dumper')
>> ---------------------------------------------------------------------------
>> exceptions.ValueError                                Traceback (most
>> recent call last)
>>
>> /home/backtopop/Work/workspace-python/pyflows/src/<ipython console>
>>
>> /usr/lib64/python2.4/site-packages/numpy/core/numeric.py in load(file)
>>     331     if isinstance(file, type("")):
>>     332         file = _file(file,"rb")
>> --> 333     return _cload(file)
>>     334
>>     335 # These are all essentially abbreviations
>>
>> /usr/lib64/python2.4/site-packages/numpy/core/_internal.py in
>> _reconstruct(subtype, shape, dtype)
>>     251
>>     252 def _reconstruct(subtype, shape, dtype):
>> --> 253     return ndarray.__new__(subtype, shape, dtype)
>>     254
>>     255
>>
>> ValueError: ('data-type with unspecified variable length', <function
>> _reconstruct at 0x2aaaafcf1578>, (<class 'numpy.core.records.recarray'>,
>> (0,), 'V'))
>>
>>
>>
>>
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>>     
>
> I'm newbie moving from numarray and I also get this error. I tried svn
> records.py with the same result. Any hope in getting it fixed?
> The error can be reproduce from the source example:
>
> import  numpy.core.records as rec
> r=rec.fromrecords([(456,'dbe',1.2),(2,'de',1.3)],names='col1,col2,col3')
> import cPickle
> print cPickle.loads(cPickle.dumps(r))
> ---------------------------------------------------------------------------
> exceptions.ValueError                                Traceback (most recent
> call last)
>
> /home/jordi/temp/<ipython console>
>
> /usr/lib/python2.4/site-packages/numpy/core/_internal.py in
> _reconstruct(subtype, shape, dt ype)
>     251
>     252 def _reconstruct(subtype, shape, dtype):
> --> 253     return ndarray.__new__(subtype, shape, dtype)
>     254
>     255
>
> ValueError: ('data-type with unspecified variable length', <function
> _reconstruct at 0xb78f ce64>, (<class 'numpy.core.records.recarray'>,
> (0,), 'V'))
>
>
>
>
>
>
>
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