Sage version 9.1 still supports python2. Compile it from source using
"./configure --with-python=2" and check whether the resulting sage can read
your file.
On Friday, July 24, 2020 at 3:03:07 PM UTC-7, Udo Baumgartner wrote:
>
> I have lots of precomputed data computed by sage8.9 and before that I rely
> on. The reason I save that data is that it took a lot of computation time
> to obtain it. The data is saved as .sobj-files.
>
> Suddenly I get "invalid pickle data"-errors when trying to load some of
> that data with the new version of sage. I am therefore unable to do
> computations on top of the precomputed data.
>
> I strongly suspect that this issue is due to basing sage9.x on Python3.
>
> How do I convert the data so that I can use it in the new version of sage?
>
> I'm using *sage-9.1-OSX_10.15.4-x86_64.app* now on a late 2013 MacBookPro
> running MacOSCatalina 10.15.6. A toy example of a sobj-file that now
> produces the error is attached. The error messages are reproduced below.
>
>
> Help is greatly appreciated.
>
>
> Now, said error messages:
>
> ---------------------------------------------------------------------------RuntimeError
> Traceback (most recent call
> last)<ipython-input-1-90aa9dc4a056> in <module>()----> 1 DiGraph =
> load('A3VuDiGraph')
> /Applications/SageMath-9.1.app/Contents/Resources/sage/local/lib/python3.7/site-packages/sage/misc/persist.pyx
> in sage.misc.persist.load (build/cythonized/sage/misc/persist.c:2900)()
> 156 157 ## Load file by absolute filename--> 158 with
> open(filename, 'rb') as fobj: 159 X = loads(fobj.read(),
> compress=compress, **kwargs) 160 try:
> /Applications/SageMath-9.1.app/Contents/Resources/sage/local/lib/python3.7/site-packages/sage/misc/persist.pyx
> in sage.misc.persist.load (build/cythonized/sage/misc/persist.c:2850)()
> 157 ## Load file by absolute filename 158 with open(filename,
> 'rb') as fobj:--> 159 X = loads(fobj.read(), compress=compress,
> **kwargs) 160 try: 161 X._default_filename =
> os.path.abspath(filename)
> /Applications/SageMath-9.1.app/Contents/Resources/sage/local/lib/python3.7/site-packages/sage/misc/persist.pyx
> in sage.misc.persist.loads (build/cythonized/sage/misc/persist.c:7424)()
> 1042 1043 unpickler = SageUnpickler(io.BytesIO(s), **kwargs)-> 1044
> return unpickler.load() 1045 1046
> /Applications/SageMath-9.1.app/Contents/Resources/sage/local/lib/python3.7/site-packages/sage/matrix/matrix0.pyx
> in sage.matrix.matrix0.unpickle
> (build/cythonized/sage/matrix/matrix0.c:39715)() 5874 A._cache = cache
> 5875 if version >= 0:-> 5876 A._unpickle(data, version) 5877
> else: 5878 A._unpickle_generic(data, version)
> /Applications/SageMath-9.1.app/Contents/Resources/sage/local/lib/python3.7/site-packages/sage/matrix/matrix_integer_dense.pyx
> in sage.matrix.matrix_integer_dense.Matrix_integer_dense._unpickle
> (build/cythonized/sage/matrix/matrix_integer_dense.c:8217)() 540
> self._unpickle_matrix_2x2_version0(data) 541 else:-->
> 542 raise RuntimeError("invalid pickle data") 543
> else: 544 raise RuntimeError("unknown matrix version
> (=%s)"%version)
> RuntimeError: invalid pickle data
>
>
>
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