[issue24916] In sysconfig, don't rely on sys.version format

[Lysandros Nikolaou]

Lysandros Nikolaou <lisandrosnik at gmail.com> added the comment:

I'm working on changing _PY_VERSION to get its value from sys.version_info instead of sys.version, but I am not sure what the best way is to map between a release stage to the corresponding letter(release->rc). Could someone help me a tiny bit with this one?

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nosy: +lys.nikolaou

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<https://bugs.python.org/issue24916>
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