Hacker News Reader

In Python 4.0 (the one after 3.9), and in Python 3.7 now with "from __future__ import annotations", annotations are parsed but their interpolation is delayed. So you can literally have "var: 0 < var < 3" (annotation is not a string!) in your code and make it work as you wish.

View on HN

FYI, the Python version after 3.9 will be 3.10.

Who told you that? ;)

This post: https://www.curiousefficiency.org/posts/2014/08/python-4000....

That's outdated info.

Relevant link: "PEP 563: Postponed Evaluation of Annotations" https://docs.python.org/3/whatsnew/3.7.html#pep-563-postpone...

If your macro isn't changing execution semantics, it probably doesn't need to be a macro.

This is why (if needs to be a special form if your language is eager, but you want to have short circuit conditionals. If you language is lazy, lots of things DON'T need to be macros.

Reply on news.ycombinator.com