I am happy to announce that I have accepted PEP 643: Metadata for Package Source Distributions, which has the potential to dramatically simplify Python package metadata resolution in the future. https://python.org/dev/peps/pep-0643/
Soon you may be able to build reliable dependency graphs!
With the right implementation in setuptools, 90% of packages will start cutting releases with reliable dependency metadata without any action needed by their maintainers.
You can ensure that your package will have properly annotated reliable metadata by either:
Specifying install_requires in setup.cfg or by using literals in your http://setup.py. If you have conditional dependencies, use environment markers:
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