[issue40360] Deprecate lib2to3 (and 2to3) for future removal

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Guido: How come the deprecation didn't happen in 3.10? Were people just not interested?

Well, if nobody deprecates it, it's not deprecated. It is simple as it it :-)

IMO it's ok to only deprecate it in Python 3.11, unless Pablo *really* wants to deprecate lib2to3 before just Python 3.10 final.

I dislike adding new warnings between a beta1 release and the final release :-( In my experience, it *does* break projects which care of warnings.

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