Hi all, do installers like pip and conda consult trove classifiers, or more generally is there a way to "mark" a package published on PyPI as installable only in a Python 3 environment? An user proposed[1] to change the classifiers of a package to get that result, so I tried looking at pip and setuptools sources, but didn't find evidence of that. I see both use python_requires[2] in their setup that seem closer to the goal, but again, is that actually honored by pip and/or other installers? Thanks for any hint, ciao, lele. [1] https://github.com/python-rapidjson/python-rapidjson/pull/47 [2] https://www.python.org/dev/peps/pep-0345/#requires-python -- nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia. lele@metapensiero.it | -- Fortunato Depero, 1929.