> I'm working on a patch to remove the major version of sys.platform

As expected by Marc-Andre: we need this information and so it has to be available somewhere else. I created #12794 to add platform.major(). I prefer to get the major version at runtime, not the major version used to build Python. I need the major version for Python tests: the tests checks features of the running system (kernel), not of the system used to build Python.

@Marc-Andre Lemburg: If you still think that we need all information about the system used to build Python, please open another issue (or comment maybe #12794).