jcorpac Flask Foundations
Flask is a micro-framework, but professional applications require structure to remain maintainable.
Application Factory Pattern
Avoid global app objects. Instead, use a function to create the application instance.
- Benefits: Easier testing (multiple app instances), better configuration management, and avoidance of circular imports.
- Pattern:
def create_app(config_class=Config): ...
Blueprints
Organize your application into distinct components (e.g., auth, api, main).
- Registration:
app.register_blueprint(auth_bp, url_prefix='/auth') - Utility: Keeps codebases modular and allows for shared middleware/filters per component.
Best Practices
- Environment Config: Use a
Configclass andpython-dotenvfor sensitive keys. - Lifecycle: Understand
before_request,after_request, andteardown_appcontext.