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

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

Hugh Cole-Baker created AIRFLOW-3779:
----------------------------------------

             Summary: 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
         Environment: Mac OS 10.13.6, Python 3.6.4_4 installed from Homebrew.
            Reporter: Hugh Cole-Baker


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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