Python Project Structure

Helps you organize Python codebases with clear module boundaries and explicit public APIs. Covers directory layout decisions, when to use `__all__` for interface definition, flat vs nested structures, and test file placement strategies. Good for starting new projects or refactoring messy ones where imports are confusing and module responsibilities are blurred. The layered vs domain-driven organization patterns are solid, and the guidance on keeping files focused while avoiding deep nesting will save you from the typical "where does this code belong" paralysis that kills productivity.