Make main.py readable again... Or not?

[insspb]

I want to talk about main.py file and main function in general.
Currently this function include everything it do in one big function, and has very high cognitive complexity. This mean that any developer, who want to make updates need to understand whole function, find all variables definitions and redefinitions that happen during execution etc. This looks completely non-pythonic, not dry, not srp.

So I have two questions:

1. What is the reason for such programming style. Just history behavior or something more serious?
2. Are we open for simplification and refactoring? Can I do it? (I have some scratches)

[cyberw]

I agree, it is a big mess. Its not even plain "spaghetti" code, but a strange mix of styles :)

If you are able to take a stab at it, that would be very welcome! Here are some of my opinions

• I'm generally not a fan of introducing small functions (less than, say, 3-4 lines of code) that are only ever called once. IMO, they usually read worse to everyone but the creator of the function :)
• Feel free to introduce Python 3.10 syntax, now that we've dropped support for 3.9.
• I'd love to see the main_greenlet to be refactored away, I've always found it weird.
• Be careful if you re-order things (e.g. the handling of --processes has to happen pretty much exactly where it is right now)
• If you can move stuff out of the main function into just about any other existing module, then that is great
• Keep your first changes small and make a PR early (mark it draft if you're not ready to merge)