cc. @vstinner

Enough nitpicking, you can always enhance the code later ;-) I merged your PR, thanks. I guess that the next step is to modify existing tests to use it.

Backport to 3.10? I guess not.

Backport to 3.10? I guess not.

It seems like more changes are coming. Once they all landed into main, maybe write a backport to 3.10 PR including all of them at once (git cherry-pick -x all commits in the right order). Or we can leave 3.10 as it is: it's more up to you.

Lets leave 3.10 as it is.

@pablogsal, should we backport this? grep -r disallow_insta Lib/test | wc -l gives me 14 hits on the 3.10 branch, including the recently backported sqlite3 test.

@pablogsal, should we backport this? grep -r disallow_insta Lib/test | wc -l gives me 14 hits on the 3.10 branch, including the recently backported sqlite3 test.

I would prefer to backport it, yep

Once they all landed into main, maybe write a backport to 3.10 PR including all of them at once (git cherry-pick -x all commits in the right order)

@vstinner: I've opened GH-26885 which is a backport of this PR, GH-26394 (docs for this PR), and GH-26392 (apply this PR to Lib/test).