[Python-Dev] PEP 405 (pyvenv) and system Python upgrades

[Chris Angelico]

On Sat, May 5, 2012 at 6:49 AM, Carl Meyer <carl at oddbird.net> wrote:
> 2) In addition to the above, introduce a versioning marker in the standard
> library (is there one already?) and have some code somewhere (insert
> hand-waving here) check sys.version_info against the stdlib version, and
> fail fast with an unambiguous error if there is a mismatch. This makes the
> failure more explicit, but at the significant cost of making it more common:
> at every mismatch, not just in the apparently-rare case of a breaking
> change.

Variant: Could the versioning marker give a minimum and/or maximum?
It'd then only cause the explicit failure in the actual case of a
breaking change, and the rest of the time it could happily use any
X.Y.* release.

ChrisA