Only install enum34 in python < 3.4

[oakhan3]

Hi guys,

I am running into a problem where installing this sdk in a python version above 3.3 results in the following error:

    ERROR: Command errored out with exit status 1:
     command: /home/********/project/.venv/bin/python /home/********/project/.venv/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-zy0jipsb/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.8.0' wheel
         cwd: None
    Complete output (14 lines):
    Traceback (most recent call last):
      File "/usr/local/lib/python3.7/runpy.py", line 193, in _run_module_as_main
        "__main__", mod_spec)
      File "/usr/local/lib/python3.7/runpy.py", line 85, in _run_code
        exec(code, run_globals)
      File "/home/********/project/.venv/lib/python3.7/site-packages/pip/__main__.py", line 23, in <module>
        from pip._internal.cli.main import main as _main  # isort:skip # noqa
      File "/home/********/project/.venv/lib/python3.7/site-packages/pip/_internal/cli/main.py", line 5, in <module>
        import locale
      File "/home/********/project/.venv/lib/python3.7/locale.py", line 16, in <module>
        import re
      File "/home/********/project/.venv/lib/python3.7/re.py", line 143, in <module>
        class RegexFlag(enum.IntFlag):
    AttributeError: module 'enum' has no attribute 'IntFlag'
    ----------------------------------------
  ERROR: Command errored out with exit status 1: /home/********/project/.venv/bin/python /home/********/project/.venv/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-zy0jipsb/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.8.0' wheel Check the logs for full command output.

This is because facebook-python-business-sdk requires you to install enum34 regardless of your python version.

enum34 is a package that override the enum namespace in the python standard library in python versions 3.4 and above. This package has a slightly different api from the standard library version and if your code or the code in any of your other dependencies calls on enum, it can trigger a traceback like above.

It is a necessary package for python versions below 3.4 since enums did not exist in those versions.

This PR should alleviate this issue.

[facebook-github-bot]

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[facebook-github-bot]

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[oakhan3]

Link to issue: https://developers.facebook.com/support/bugs/2905833072805310/

[facebook-github-bot]

@jingping2015 merged this pull request in facebook/facebook-python-business-sdk@1c04d9e19e81000363e4608874499bce736fd58a.

[litan1106]

@stcheng we still see this issue happen in python3.11

this needs to be fixed in main branch.

requirements.txt enum34; python_version < '3.4'