Proposal: Remove Python 2 Support and Refactor Scripts to Modern Python 3 Syntax

[chen-qingyu]

Dear maintainers,

I'd like to propose updating our Python scripts to use modern Python 3 syntax exclusively. Currently, maintaining compatibility with Python 2 requires extra complexity that may inadvertently hinder students' learning experience.

Key reasons for this change:

1. Educational value:
   Students may analyze and modify these scripts as part of their learning journey. Legacy Python 2 syntax creates unnecessary cognitive load when they should be focusing on OS concepts.

2. Readability matters:
   As the Zen of Python reminds us:

   • "Readability counts" (compatibility checks clutter core logic)
   • "There should be one obvious way to do it" (dual implementations violate this)
     Modern Python 3 features like f-strings (f"PID: {pid}") would make algorithms more transparent.

3. Relevance:
   Python 2 reached end-of-life in 2020, and students now learn Python 3 first. Our scripts might better serve students through cleaner code.

Proposed approach:

• Remove all Python 2 compatibility layers (e.g. __future__)
• Migrate to Python 3.10+ LTS (or newer) with modern syntax
• Maintain exact functionality through careful testing

If this proposal aligns with the project's educational goals, I'd be grateful for the opportunity to contribute initial refactoring for a few scripts as proof of concept.

Thank you kindly for your consideration.