[Python-Dev] Re: PEP 649: Deferred Evaluation Of Annotations Using Descriptors, round 2

On Fri, 16 Apr 2021, 3:14 pm Larry Hastings, <larry@hastings.org> wrote:

Anyway I assume it wasn't "fixable". The compiler would presumably already prefer to generate LOAD_GLOBAL vs LOAD_NAME, because LOAD_GLOBAL would be cheaper every time for a global or builtin. The fact that it already doesn't do so implies that it can't.

Metaclass __prepare__ methods can inject names into the class namespace that the compiler doesn't know about, so yeah, it unfortunately has to be conservative and use LOAD_NAME in class level code. Cheers, Nick.