Shouldn't those change be ported to 3.10 and maybe even earlier version? They are great, but hard to find if you read the current version manual.

I'm just surprised by the term "dotted lookup". The remaining of the documentation mention "attribute access". So I assumed that there was a reason to use "dotted lookup" instead of "attribute access". If there is such a reason, it's not clear right now. Otherwise, if they are equivalent, I'd suggest remaining consistent in the term used.

I must note that "dotted lookup" is also used in the howto about descriptor, but it does not explain the difference with "attribute access".

One last note, I find it a little bit strange that `a` was supposed to be the value on which the access is done, and suddenly it becomes a part of the value.