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https://issues.apache.org/jira/browse/AIRFLOW-3779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756460#comment-16756460
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ASF GitHub Bot commented on AIRFLOW-3779:
-----------------------------------------
feng-tao commented on pull request #4620: [AIRFLOW-3779] Don't install enum34
backport when not needed
URL: https://github.com/apache/airflow/pull/4620
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> Installing airflow with dependency enum34 on Python 3.6 breaks built-in "re"
> module
> -----------------------------------------------------------------------------------
>
> Key: AIRFLOW-3779
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3779
> Project: Apache Airflow
> Issue Type: Bug
> Affects Versions: 1.10.2
> Environment: Mac OS 10.13.6, Python 3.6.4_4 installed from Homebrew,
> Airflow 1.10.2.
> Reporter: Hugh Cole-Baker
> Assignee: Ash Berlin-Taylor
> Priority: Major
>
> Installing airflow in a Python 3.6 virtualenv brings in the enum34 package as
> a dependency.
> Having enum34 installed seems like it is not compatible with the standard
> library in Python 3.6, as I've found that it breaks the built-in "re" module
> when subsequently running "pip install .", with this exception:
> {code:java}
> $ pip install .
> Processing /Users/hugh/Source/fd_af_datapipe
> Installing build dependencies ... error
> Complete output from command
> /Users/hugh/.virtualenvs/fd_af_datapipe/bin/python3.6
> /Users/hugh/.virtualenvs/fd_af_datapipe/lib/python3.6/site-packages/pip
> install --ignore-installed --no-user --prefix
> /private/var/folders/tx/9dc1l9sx4pvcst982rwbjwtw0000gn/T/pip-build-env-tnyffy_z/overlay
> --no-warn-script-location --no-binary :none: --only-binary :none: -i
> https://pypi.org/simple -- setuptools>=40.2.0 wheel:
> Traceback (most recent call last):
> File
> "/usr/local/Cellar/python/3.6.4_4/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py",
> line 193, in _run_module_as_main
> "__main__", mod_spec)
> File
> "/usr/local/Cellar/python/3.6.4_4/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py",
> line 85, in _run_code
> exec(code, run_globals)
> File
> "/Users/hugh/.virtualenvs/fd_af_datapipe/lib/python3.6/site-packages/pip/__main__.py",
> line 16, in <module>
> from pip._internal import main as _main # isort:skip # noqa
> File
> "/Users/hugh/.virtualenvs/fd_af_datapipe/lib/python3.6/site-packages/pip/_internal/__init__.py",
> line 4, in <module>
> import locale
> File "/Users/hugh/.virtualenvs/fd_af_datapipe/lib/python3.6/locale.py",
> line 16, in <module>
> import re
> File "/Users/hugh/.virtualenvs/fd_af_datapipe/lib/python3.6/re.py", line
> 142, in <module>
> class RegexFlag(enum.IntFlag):
> AttributeError: module 'enum' has no attribute 'IntFlag'
> {code}
> As a workaround, uninstalling enum34 with "pip uninstall enum34" stops this
> error from occurring.
> As far as I know, enum34 is not required on Python 3.4 upwards, so I'd
> suggest not including it in the dependencies of Airflow if Airflow is being
> installed on Python >= 3.4.
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