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

[Miro Hrončok]

Miro Hrončok <miro at hroncok.cz> added the comment:

I don't understand why there is a PendingDeprecationWarning and not a DeprecationWarning.


See https://discuss.python.org/t/pendingdeprecationwarning-is-really-useful/1038/4 and issue36404

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