Modular Code Organization Write modular Python code with files sized for maintainability and AI-assisted development. File Size Guidelines | Lines | Status | Action | |-------|--------|--------| | 150-500 | Optimal | Sweet spot for AI code editors and human comprehension | | 500-1000 | Large | Look for natural split points | | 1000-2000 | Too large | Refactor into focused modules | | 2000+ | Critical | Must split - causes tooling issues and cognitive overload | When to Split Split when ANY of these apply: - File exceeds 500 lines - Multiple unrelated concerns in same file - Scroll fatigue fin…