- different requirements for [different python versions](https://github.com/pypa/setuptools/issues/3313) - [How to publish several versions of Pypi release for several versions of Python](https://discuss.python.org/t/how-to-publish-several-versions-of-pypi-release-for-several-versions-of-python/53822) - A possible solution is to [test for the Python version](https://stackoverflow.com/questions/13924931/setup-py-restrict-the-allowable-version-of-the-python-interpreter)