[issue14673] add sys.implementation

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

*version* is a version tuple, in the format of :data:`sys.version_info`,
   which represents the version of the Python implementation, **not** the
   version of the Python specification it implements.

If that version number is specific to each VM, then I’m not sure we should mandate a specific format.

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nosy: +eric.araujo

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