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Bug 1926611 - python-music21 fails to build with Python 3.10: AttributeError: module 'collections' has no attribute 'Sequence'
Summary: python-music21 fails to build with Python 3.10: AttributeError: module 'colle...
Alias: None
Product: Fedora
Classification: Fedora
Component: python-music21
Version: rawhide
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Zbigniew Jędrzejewski-Szmek
QA Contact: Fedora Extras Quality Assurance
: 1969041 (view as bug list)
Depends On: 1697091
Blocks: PYTHON3.10 F35FTBFS, RAWHIDEFTBFS F35FailsToInstall, RAWHIDEFailsToInstall
TreeView+ depends on / blocked
Reported: 2021-02-09 08:17 UTC by Tomáš Hrnčiar
Modified: 2021-07-02 08:49 UTC (History)
3 users (show)

Fixed In Version: python-music21-6.7.1-1.fc35
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2021-07-02 08:31:56 UTC
Type: Bug

Attachments (Terms of Use)

Description Tomáš Hrnčiar 2021-02-09 08:17:04 UTC
python-music21 fails to build with Python 3.10.0a5.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/builddir/build/BUILD/music21-2.2.1/music21/", line 164, in <module>
    from music21 import * # @UnresolvedImport # pylint: disable=wildcard-import
  File "/builddir/build/BUILD/music21-2.2.1/music21/abcFormat/", line 45, in <module>
    from music21.abcFormat import translate
  File "/builddir/build/BUILD/music21-2.2.1/music21/abcFormat/", line 32, in <module>
    from music21 import stream
  File "/builddir/build/BUILD/music21-2.2.1/music21/stream/", line 52, in <module>
    from music21 import timespans
  File "/builddir/build/BUILD/music21-2.2.1/music21/timespans/", line 37, in <module>
    from music21.timespans import analysis 
  File "/builddir/build/BUILD/music21-2.2.1/music21/timespans/", line 34, in <module>
    class Horizontality(collections.Sequence):
AttributeError: module 'collections' has no attribute 'Sequence'

The deprecated aliases to Collections Abstract Base Classes were removed from the collections module.

For the build logs, see:

For all our attempts to build python-music21 with Python 3.10, see:

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 3.10:

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
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 Ben Cotton 2021-02-09 16:08:34 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle.
Changing version to 34.

Comment 2 Miro Hrončok 2021-06-04 20:14:22 UTC
This is a mass-posted update. Sorry if it is not 100% accurate to this bugzilla.

The Python 3.10 rebuild is in progress in a Koji side tag. If you manage to fix the problem, please commit the fix in the rawhide branch, but don't build the package in regular rawhide.

You can either build the package in the side tag, with:

    $ fedpkg build --target=f35-python

Or you can the build and we will eventually build it for you.

Note that the rebuild is still in progress, so not all (build) dependencies of this package might be available right away.


See also

If you have general questions about the rebuild, please use this mailing list thread:

Comment 3 Miro Hrončok 2021-06-07 22:59:01 UTC
The f35-python side tag has been merged to Rawhide. From now on, build as you would normally build.

Comment 4 Miro Hrončok 2021-06-08 11:29:01 UTC
*** Bug 1969041 has been marked as a duplicate of this bug. ***

Comment 5 Miro Hrončok 2021-06-15 20:25:19 UTC

This is the first reminder (step 3 from

If you know about this problem and are planning on fixing it, please acknowledge so by setting the bug status to ASSIGNED. If you don't have time to maintain this package, consider orphaning it, so maintainers of dependent packages realize the problem.

Comment 6 Miro Hrončok 2021-07-01 15:21:59 UTC
The failing code is not even there in more recent versions, but this commit appears to fix similar issues, included since 5.3.0.

Comment 7 Zbigniew Jędrzejewski-Szmek 2021-07-02 08:31:56 UTC
Built in rawhide.

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