[refactor] Use Path instead of os

[jurgenwigg]

• Change os to Path use.
• Refactor of the collect_python_source_files function to be simpler

[nocomplexity]

Thank you again for taking the time to submit this PR. It’s much appreciated!

Could you please remove the .gitignore from this branch? I try to keep commits atomic (focused on one specific task), and keeping the environment hygiene separate from functional code helps avoid friction during merges.

On the technical side, switching to pathlib.Path instead of os is a great shout—it definitely makes the read_in_source_file function more robust.

I need to review the logic in depth and potentially write a few more test scripts. Since this function is used for almost all the core functionality, the current test coverage isn't quite high enough to merge this blindly.

I’ll aim to get this merged (without the .gitignore change) this coming week. Unfortunately, I won't be able to get to it this weekend due to other work priorities.

Regards!

[jurgenwigg]

Ok, I'll remove that file :) if you prefer, I can write tests for that function.

[Update]
File removed.