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https://issues.apache.org/jira/browse/ARROW-9326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17151606#comment-17151606
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Wes McKinney commented on ARROW-9326:
-------------------------------------
Since I triaged this, I downgraded the severity of the issue
> [Python] Setuptools 49.1.0 appears to break our Python 3.6 builds
> -----------------------------------------------------------------
>
> Key: ARROW-9326
> URL: https://issues.apache.org/jira/browse/ARROW-9326
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: Wes McKinney
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Not sure who thought it was a good idea to release setuptools on July 3, a
> holiday in the United States, but it appears to be breaking some of our builds
> https://github.com/apache/arrow/pull/7539/checks?check_run_id=835994558
> {code}
> File
> "/opt/conda/envs/arrow/lib/python3.6/site-packages/setuptools/command/egg_info.py",
> line 297, in run
> self.find_sources()
> File
> "/opt/conda/envs/arrow/lib/python3.6/site-packages/setuptools/command/egg_info.py",
> line 304, in find_sources
> mm.run()
> File
> "/opt/conda/envs/arrow/lib/python3.6/site-packages/setuptools/command/egg_info.py",
> line 535, in run
> self.add_defaults()
> File
> "/opt/conda/envs/arrow/lib/python3.6/site-packages/setuptools/command/egg_info.py",
> line 571, in add_defaults
> sdist.add_defaults(self)
> File
> "/opt/conda/envs/arrow/lib/python3.6/site-packages/setuptools/_distutils/command/sdist.py",
> line 228, in add_defaults
> self._add_defaults_ext()
> File
> "/opt/conda/envs/arrow/lib/python3.6/site-packages/setuptools/_distutils/command/sdist.py",
> line 312, in _add_defaults_ext
> self.filelist.extend(build_ext.get_source_files())
> File "/opt/conda/envs/arrow/lib/python3.6/distutils/command/build_ext.py",
> line 420, in get_source_files
> self.check_extensions_list(self.extensions)
> File "/opt/conda/envs/arrow/lib/python3.6/distutils/command/build_ext.py",
> line 362, in check_extensions_list
> "each element of 'ext_modules' option must be an "
> distutils.errors.DistutilsSetupError: each element of 'ext_modules' option
> must be an Extension instance or 2-tuple
> {code}
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