Conditional dependency to module 'enum34': Ony for python_version < "3.4.0" #16
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The current master of rtrlib/python-binding may cause pip installations to fail on Python versions 3.6 - 3.8 because of the dependency to module enum34. This dependency is not needed for Python 3.4 and above.
This is a known issue with pip and seems to be fixed only recently (2020-12).
Since e.g. default Python version on Ubuntu 20.04 LTS is 3.8, where the issue will still be present, I think this project should guard against pip installation fails by adding a version contition to the dependency.