Flask Project Structure: From Small Projects to Large Applications

The article emphasizes the importance of Flask project structure planning, which can avoid code chaos and enhance development and maintenance efficiency. It evolves from simple to complex in stages: a single file is only suitable for quick verification but becomes hard to maintain due to code clutter; medium-sized projects split into templates, static files, but further structural standardization is needed, such as separating configurations (config.py), centralizing route management (routes.py), and isolating data models (models.py); large projects use Blueprints to split functional modules (e.g., main module, user module, blog module), achieving single responsibility and independent reusability. Best practices include: managing dependencies with requirements.txt, storing sensitive configurations in environment variables, enabling debug mode during development and disabling it in production, and adding a test directory. The core principle is "splitting functions and ensuring single responsibility," and developing the habit of standardized structures facilitates future expansion.