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Bug#1001484: sfepy: (autopkgtest) needs update for python3.10: Sequence' from 'collections' is removed

Source: sfepy
Version: 2020.4-2
Severity: serious
X-Debbugs-CC: debian-ci@lists.debian.org
Tags: sid bookworm
User: debian-ci@lists.debian.org
Usertags: needs-update
User: debian-python@lists.debian.org
Usertags: python3.10
Control: affects -1 src:python3-defaults

Dear maintainer(s),

We are in the transition of adding python3.10 to the supported Python versions [0]. With a recent upload of python3-defaults the autopkgtest of sfepy fails in testing when that autopkgtest is run with the binary packages of python3-defaults from unstable. It passes when run with only packages from testing. In tabular form:

                       pass            fail
python3-defaults       from testing    3.9.8-1
sfepy                  from testing    2020.4-2
all others             from testing    from testing

I copied some of the output at the bottom of this report.

Currently this regression is blocking the migration of python3-defaults to testing [1]. https://docs.python.org/3/whatsnew/3.10.html lists what's new in Python3.10, it may help to identify what needs to be updated. https://docs.python.org/3.9/library/collections.html says:
Deprecated since version 3.3, will be removed in version 3.10: Moved Collections Abstract Base Classes to the collections.abc module. For backwards compatibility, they continue to be visible in this module through Python 3.9.
Time to move on.

More information about this bug and the reason for filing it can be found on


[0] https://bugs.debian.org/996584
[1] https://qa.debian.org/excuses.php?package=python3-defaults


run: python3.10
Traceback (most recent call last):
File "/tmp/autopkgtest-lxc.r9o8n8_b/downtmp/autopkgtest_tmp/laplace_shifted_periodic.py", line 140, in <module>
sfepy: dimensions: [1. 1.]
sfepy: centre:     [0. 0.]
sfepy: shape:      [11 11]
sfepy: generating 121 vertices...
sfepy: ...done
sfepy: generating 100 cells...
sfepy: ...done
sfepy: updating variables...
sfepy: ...done
sfepy: setting up dof connectivities...
sfepy: ...done in 0.00 s
sfepy: lcbc: sper
sfepy: dofs: total 99, free 90, constrained 9, new 0
sfepy:  -> active 90
sfepy: matrix shape: (99, 99)
sfepy: assembling matrix graph...
sfepy: ...done in 0.00 s
sfepy: matrix structural nonzeros: 775 (7.91e-02% fill)
File "/tmp/autopkgtest-lxc.r9o8n8_b/downtmp/autopkgtest_tmp/laplace_shifted_periodic.py", line 125, in main
    pb, state = run(fe_domain, 1)
File "/tmp/autopkgtest-lxc.r9o8n8_b/downtmp/autopkgtest_tmp/laplace_shifted_periodic.py", line 82, in run
    state = pb.solve()
File "/usr/lib/python3/dist-packages/sfepy/discrete/problem.py", line 1425, in solve
    init_fun, prestep_fun, poststep_fun = self.get_tss_functions(
File "/usr/lib/python3/dist-packages/sfepy/discrete/problem.py", line 1234, in get_tss_functions
    is_save = make_is_save(self.conf.options)
File "/usr/lib/python3/dist-packages/sfepy/discrete/problem.py", line 73, in make_is_save
    is_save = IsSave(save_times)
File "/usr/lib/python3/dist-packages/sfepy/discrete/problem.py", line 42, in __init__
    if is_sequence(save_times):
File "/usr/lib/python3/dist-packages/sfepy/base/base.py", line 1049, in is_sequence
    from collections import Sequence
ImportError: cannot import name 'Sequence' from 'collections' (/usr/lib/python3.10/collections/__init__.py)
autopkgtest [14:19:44]: test build1

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