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Bug 1791740 - Zim fails to build with Python 3.9: imports abc from collections
Summary: Zim fails to build with Python 3.9: imports abc from collections
Keywords:
Status: CLOSED DEFERRED
Alias: None
Product: Fedora
Classification: Fedora
Component: Zim
Version: rawhide
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Robin Lee
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: PYTHON39
TreeView+ depends on / blocked
 
Reported: 2020-01-16 12:19 UTC by Miro Hrončok
Modified: 2020-02-28 09:07 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-02-28 09:07:22 UTC
Type: Bug
Embargoed:

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System ID Private Priority Status Summary Last Updated
Github zim-desktop-wiki zim-desktop-wiki issues 1005 0 None None None 2020-01-17 01:41:59 UTC

Description Miro Hrončok 2020-01-16 12:19:46 UTC 
Zim fails to build with Python 3.9.0a2.

+ ./setup.py build
Traceback (most recent call last):
  File "/builddir/build/BUILD/zim-0.72.0/./setup.py", line 25, in <module>
    import makeman # helper script
  File "/builddir/build/BUILD/zim-0.72.0/makeman.py", line 13, in <module>
    from zim.main import HelpCommand
  File "/builddir/build/BUILD/zim-0.72.0/zim/main/__init__.py", line 24, in <module>
    import zim.config
  File "/builddir/build/BUILD/zim-0.72.0/zim/config/__init__.py", line 10, in <module>
    from .dicts import *
  File "/builddir/build/BUILD/zim-0.72.0/zim/config/dicts.py", line 35, in <module>
    from zim.utils import OrderedDict
  File "/builddir/build/BUILD/zim-0.72.0/zim/utils.py", line 191, in <module>
    class OrderedDict(collections.MutableMapping):
AttributeError: module 'collections' has no attribute 'MutableMapping'

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_64/01148317-Zim/

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

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 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 2020-02-11 17:34:02 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 32 development cycle.
Changing version to 32.
Comment 2 Miro Hrončok 2020-02-28 09:07:22 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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