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Bug#940795: fonttools breaks ufolib2 autopkgtest: cannot import name 'PY3' from 'fontTools.misc.py23

Source: fonttools, ufolib2
Control: found -1 fonttools/4.0.0-1
Control: found -1 ufolib2/0.3.2+dfsg1-1
Severity: serious
Tags: sid bullseye
X-Debbugs-CC: debian-ci@lists.debian.org
User: debian-ci@lists.debian.org
Usertags: breaks needs-update

Dear maintainers,

With a recent upload of fonttools the autopkgtest of ufolib2 fails in
testing when that autopkgtest is run with the binary packages of
fonttools from unstable. It passes when run with only packages from
testing. In tabular form:
                       pass            fail
fonttools              from testing    4.0.0-1
ufolib2                from testing    0.3.2+dfsg1-1
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 fonttools to
testing [1]. Due to the nature of this issue, I filed this bug report
against both packages. Can you please investigate the situation and
reassign the bug to the right package? By the way, the version of
ufolib2 in unstable is failing for a different reason.

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


[1] https://qa.debian.org/excuses.php?package=fonttools


Testing with python3.7:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/ufoLib2/__init__.py", line 3, in
    from ufoLib2.objects import Font
  File "/usr/lib/python3/dist-packages/ufoLib2/objects/__init__.py",
line 4, in <module>
    from ufoLib2.objects.font import Font
  File "/usr/lib/python3/dist-packages/ufoLib2/objects/font.py", line 9,
in <module>
    from ufoLib2.objects.info import Info
  File "/usr/lib/python3/dist-packages/ufoLib2/objects/info.py", line 4,
in <module>
    from ufoLib2.types import (
  File "/usr/lib/python3/dist-packages/ufoLib2/types.py", line 2, in
    from fontTools.misc.py23 import PY3
ImportError: cannot import name 'PY3' from 'fontTools.misc.py23'

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