python-project-structurelisted

# Python Project Structure & Module Architecture Design well-organized Python projects with clear module boundaries, explicit public interfaces, and maintainable directory structures. Good organization makes code discoverable and changes predictable. ## Core Concepts ### 1. Module Cohesion Group related code that changes together. A module should have a single, clear purpose. ### 2. Explicit Interfaces Define what's public with `__all__`. Everything not listed is an internal implementation detail. ### 3. Flat Hierarchies Prefer shallow directory structures. Add depth only for genuine sub-domains. ### 4. Consistent Conventions Apply naming and organization patterns uniformly across the project. ## Quick Start ```text myproject/ |-- src/ | `-- myproject/ | |-- __init__.py | |-- services/ | |-- models/ | `-- api/ |-- tests/ |-- pyproject.toml `-- README.md ``` ## Fundamental Patterns ### Pattern 1: One Concept Per File Each file should focus on a single concept or closely related set of functions. Consider splitting when a file: - Handles multiple unrelated responsibilities - Grows beyond 300-500 lines (varies by complexity) - Contains classes that change for different reasons ```python # Good: Focused files # user_service.py - User business logic # user_repository.py - User data access # user_models.py - User data structures # Avoid: Kitchen sink files # user.py - Contains service, repository, models, utilities... ``` ### Pattern 2: