Le 30/08/2019 à 12:54, Simon King a écrit :
Hi Steve,
On Friday, August 30, 2019 at 11:55:45 AM UTC+2, Dima Pasechnik wrote:
On Fri, Aug 30, 2019 at 12:48 PM 'SteveJJ' via sage-support
<sage-s...@googlegroups.com <javascript:>> wrote:
I saved a session when using sage 8.0.
When I try to load that session into sage 8.8, I get errors such as:
RuntimeError: invalid pickle data
ValueError: unknown matrix implementation 'flint' over Symbolic Ring
The full error output is below.
Am I missing some packages or do I need to somehow convert the session
file?
I don't think that sage/load_session is guaranteed w.r.t. any kind of
backward/forward compatibility.
It relies on internals being unchanged, which is certainly not the
case from one Sage version to another.
If I understand correctly, saving/loading individual objects is supposed to
be backwards compatible.
This is not correct. Saving individual object is not supposed to
be backward compatible. See
https://trac.sagemath.org/ticket/28302
Vincent
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