[jira] [Updated] (AIRFLOW-3779) Installing airflow with dependency enum34 on Python 3.6 breaks built-in "re" module

["Hugh Cole-Baker (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AIRFLOW-3779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hugh Cole-Baker updated AIRFLOW-3779:
-------------------------------------
    Affects Version/s: 1.10.2
          Environment: Mac OS 10.13.6, Python 3.6.4_4 installed from Homebrew, Airflow 1.10.2.  (was: Mac OS 10.13.6, Python 3.6.4_4 installed from Homebrew.)

> 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
>            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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