py3: cluster_algebra_quiver pickle depends on Python version

[jdemeyer]

The pickle cluster_algebra_quiver/mutation_classes_%s.dig6 currently depends on the Python version: pickles created with Python 3 cannot be opened with Python 2.

There are multiple solutions to this, such as ensuring that a pickle is always stored in a compatible version. But since these pickles are optional, a simpler solution is simply ignoring unpickling errors.

CC: @fchapoton @embray

Component: python3

Author: Jeroen Demeyer

Branch/Commit: a16ae1f

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/27545

[jdemeyer]

Branch: u/jdemeyer/py3__cluster_algebra_quiver_pickle_depends_on_python_version

[jdemeyer]

New commits:

a16ae1f

Ignore all errors while unpickling cluster_algebra_quiver pickle

[jdemeyer]

Commit: a16ae1f

[embray]

comment:3

This has been a frequent source of annoyance for me as well. Personally I would prefer to have different versions of the file depending on the Python version. But at the same time most users won't be using Python 2 Sage and Python 3 Sage together on the same system, and even if we did do that, ignoring unpickle errors here would still be desirable. This is just a cache and regenerating the cache if needed is no big deal since it does not take so long.

[fchapoton]

comment:4

ok, thx

[fchapoton]

Reviewer: Frédéric Chapoton

[vbraun]

Changed branch from u/jdemeyer/py3__cluster_algebra_quiver_pickle_depends_on_python_version to a16ae1f