type annotations: Replace Union[a, b] with a | b, Optional[a] with a | None

[rht]

Looks like it is possible to do it even on Python older than 3.10. See projectmesa/mesa-geo#67 (comment).

Update: from implementing #1345, looks like older Pythons don't support type aliases with | yet. For this issue to be completely resolved, we need to wait until 3.10 is the oldest supported version.

[EwoutH]

pyupgrade should be able to do that automatically (by running pyupgrade --py310-plus).

[ayeankit]

Hey @EwoutH, Is this still open?

[Aryan1Mahahjan]

I noticed this issue hasn't been updated in a while. Is it still relevant and open for contributions? Specifically, I'm interested in working on #1341.

[rht]

Still not applicable, because the oldest supported Python is still 3.9:

mesa/pyproject.toml

Line 9 in 665aebc

requires-python = ">=3.9"

.

[EwoutH]

According to SPEC 0 we could drop Python 3.9 support already. But since Python 3.9 is still quite well supported (also by NumPy for example), I would propose keeping it for a bit until Mesa 2.3 is released. Then for 2.4 or 3.0 we can drop 3.9 and require 3.10+.

@Aryan1Mahahjan you could already make an PR, make sure it's passing on the current CI for Python 3.10 and higher. But you might need to update the PR in a few months.

Note that pyupgrade can probably already do a part of the work.

[manvendra5345]

Hi everyone!
I am Manvendra Singh Solanki from Cse Ai-Ml background and i am also interested in working in this project , I know python , java , HTML , CSS . I can adapt very fast and have great learning capacity but these thing are common what i think i have different in me is that i want to learn from thoes who are better than me and catch up to them and even beat them and always keep learning.

I also want to contribute and learn but i am new to this platform please guide me .

Email:- [email protected]