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

[Carl Meyer]

Carl Meyer <carl at oddbird.net> added the comment:

Right, although I think it still makes sense to link both LibCST and parso since they provide different levels of abstraction that would be suitable for different types of tools (e.g. I would rather write an auto-formatter on top of parso, because LibCST's careful parsing and assignment of whitespace would mostly just get in the way, but I'd rather write any kind of refactoring tooling on top of LibCST.)

Another tool that escaped my mind when writing the PR that should probably be linked also is Baron/RedBaron (https://github.com/PyCQA/redbaron); 457 stars makes it slightly more popular than LibCST (but it's also been around a lot longer.)

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