gh-93963: Officially deprecate abcs and warn about their usage.

[jaraco]

Fixes#93963

• Issue: Officially deprecate and remove abcs in importlib.abc moved to importlib.resources. #93963

Automerge-Triggered-By: GH:jaraco

[hugovk]

Please could you note the deprecations in https://docs.python.org/3.12/library/importlib.html with deprecated-removed?

and list under https://docs.python.org/3.12/whatsnew/3.12.html#pending-removal-in-python-3-13 ?

[hugovk]

According to PEP 387, if these are being deprecated in 3.12, is 3.14 the earliest they can be removed?

[warsaw]

Added some questions.

[bedevere-bot]

When you're done making the requested changes, leave the comment: I have made the requested changes; please review again.

[encukou]

Honestly, I don't think all this is necessary. What would be the harm if they stay importable from both places?

[warsaw]

Honestly, I don't think all this is necessary. What would be the harm if they stay importable from both places?

From a backward compatibility question, none. But we should be crisp in the documentation about where the proper place to import them from is, and add deprecations for the old places.

[jaraco]

According to PEP 387, if these are being deprecated in 3.12, is 3.14 the earliest they can be removed?

Yes, although I contend it would be preferable to deprecate these in 3.11 for removal in 3.13, given that is the prior intention.

[hugovk]

Okay! I thought the 3.11 beta period was too late for new deprecations, but let's check with @pablogsal to see if this can be backported to 3.11.

[pablogsal]

Okay! I thought the 3.11 beta period was too late for new deprecations, but let's check with @pablogsal to see if this can be backported to 3.11.

Indeed, unfortunately is too late to add new deprecations to 3.11, specially given how unstable 3.11 is already. Sadly this needs to be done starting in 3.12 :(

[jaraco]

I have made the requested changes; please review again.

[bedevere-bot]

Thanks for making the requested changes!

@warsaw: please review the changes made to this pull request.