Peter Williams added the comment:
I'm experiencing a variation of this problem on a project where I'm trying to
make an application that will work with both 2.7.x and 3.4.x
and am mostly successful. The application uses a number of pickle files
and I want to make it so that it doesn't matter which version created the
pickle files the other can read it. By limiting the 3.4 version to
pickle protocol 2 I've succeeded in having 2.7.x read 3.4.x pickle files
but encountered a problem going the other way with the following
error message:
Traceback (most recent call last):
File "/home/peter/SRC/GITHUB/epygibus.git/epygibus3", line 25, in <module>
sys.exit(ARGS.run_cmd(ARGS))
File
"/home/peter/SRC/GITHUB/epygibus.git/epygibus_pkg/cli/subcmd_restore.py", line
70, in run_cmd
snapshot.restore_subdir(args.archive_name, os.sep, seln_fn=lambda l:
l[-1-args.back])
File "/home/peter/SRC/GITHUB/epygibus.git/epygibus_pkg/snapshot.py", line
699, in restore_subdir
snapshot_fs = get_snapshot_fs(archive_name,
seln_fn).get_subdir(abs_subdir_path)
File "/home/peter/SRC/GITHUB/epygibus.git/epygibus_pkg/snapshot.py", line
595, in get_snapshot_fs
snapshot = read_snapshot(os.path.join(archive.snapshot_dir_path,
snapshot_name))
File "/home/peter/SRC/GITHUB/epygibus.git/epygibus_pkg/snapshot.py", line
236, in read_snapshot
return pickle.load(fobj)
AttributeError: Can't get attribute '_make_stat_result' on <module 'os' from
'/usr/lib64/python3.4/os.py'>
I'm pretty sure that this is a result of that pickle file containing
instances of the output from os.lstat() generated by 2.7.x which 3.4.x
is having trouble instantiating.
The source code for the application with the problem is available on
github as repo "epygibus" for user "pwil3058".
----------
nosy: +Peter Williams
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Python tracker <[email protected]>
<http://bugs.python.org/issue7164>
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