Bug 1792974 - python-mpd2 fails to build with Python 3.9: imports abc from collections
Summary: python-mpd2 fails to build with Python 3.9: imports abc from collections
Keywords:
Status: CLOSED DEFERRED
Alias: None
Product: Fedora
Classification: Fedora
Component: python-mpd2
Version: rawhide
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Ankur Sinha (FranciscoD)
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: PYTHON39
TreeView+ depends on / blocked
 
Reported: 2020-01-20 13:07 UTC by Miro Hrončok
Modified: 2020-02-28 09:07 UTC (History)
5 users (show)

Fixed In Version:
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Clone Of:
Environment:
Last Closed: 2020-02-28 09:07:48 UTC
Type: Bug
Embargoed:


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Description Miro Hrončok 2020-01-20 13:07:44 UTC
python-mpd2 fails to build with Python 3.9.0a2.

+ /usr/bin/python3 setup.py build '--executable=/usr/bin/python3 -s'
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-mpd2-1.0.0/setup.py", line 6, in <module>
    import mpd
  File "/builddir/build/BUILD/python-mpd2-1.0.0/mpd/__init__.py", line 20, in <module>
    from mpd.base import CommandError
  File "/builddir/build/BUILD/python-mpd2-1.0.0/mpd/base.py", line 20, in <module>
    from collections import Callable
ImportError: cannot import name 'Callable' from 'collections' (/usr/lib64/python3.9/collections/__init__.py)

See https://docs.python.org/3.9/whatsnew/3.9.html#removed

"The abstract base classes in collections.abc no longer are exposed in the regular collections module. This will help create a clearer distinction between the concrete classes and the abstract base classes."


For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01161740-python-mpd2/

For all our attempts to build python-mpd2 with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-mpd2/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.

Comment 1 Karthikeyan Singaravelan 2020-01-22 12:34:55 UTC
Upstream issue : https://github.com/Mic92/python-mpd2/issues/108

Comment 2 Hugo van Kemenade 2020-01-23 15:18:20 UTC
"1.1.0 now includes this fix as well."

https://github.com/Mic92/python-mpd2/issues/108#issuecomment-577259641

Comment 3 Ben Cotton 2020-02-11 17:27:18 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 32 development cycle.
Changing version to 32.

Comment 4 Miro Hrončok 2020-02-28 09:07:48 UTC
In Python 3.9.0a4 we have managed to revert the change that disables importing abstract base classes (collections.abc) directly form the regular collections module. It was reverted to ease transition for projects that did not yet actually dropped support for Python 2.7. The removal is scheduled for Python 3.10 instead.

We are mass closing all the bug reports about build failures that were caused by this. Expect a new Bugzilla report in case this package fails to build with Python 3.9 for a different reason as well.

In case you haven't done this already, we highly recommend to talk to your upstream and get this fixed anyway, because this will return in Python 3.10 and Python upstream is very unlikely to postpone this once more. In case you've already done that, thank you (this message is mass posted to all the relevant Bugzillas).


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