[Distutils] PEP 508, environment markers & the possibility of Python 3.10

[Nick Coghlan]

Hi folks,

In https://github.com/python/peps/issues/560, a user pointed out that
the current definition of python_version in PEP 508 assumes
single-digit major and minor version numbers:

   platform.python_version()[:3]

There's a reasonable chance we'll see 3.10 rather than 4.0 in a few
years time, at which point that definition would break.

The suggested fix is to amend that definition to be:

    ".".join(platform.python_version_tuple()[:2])

This seems like a good suggestion to me, so my inclination is to
handle this in a similar way to
https://www.python.org/dev/peps/pep-0440/#summary-of-changes-to-pep-440:
fix it in place, and add a section at the end of the PEP listing the
post-publication changes.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia