🍶 Flask

Flask Application Structure

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# Application Factory Pattern
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_cors import CORS

db = SQLAlchemy()

def create_app(config_name='development'):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    
    # Initialize extensions
    db.init_app(app)
    CORS(app)
    
    # Register blueprints
    from .api import api_bp
    app.register_blueprint(api_bp, url_prefix='/api/v1')
    
    # Error handlers
    @app.errorhandler(404)
    def not_found(error):
        return {'error': 'Not found'}, 404
    
    return app

# Blueprint-based API
from flask import Blueprint, request, jsonify
from flask_restful import Api, Resource

api_bp = Blueprint('api', __name__)
api = Api(api_bp)

class DocumentResource(Resource):
    def get(self, doc_id):
        document = Document.query.get_or_404(doc_id)
        return document.to_dict()
    
    def put(self, doc_id):
        document = Document.query.get_or_404(doc_id)
        data = request.get_json()
        document.update(data)
        db.session.commit()
        return document.to_dict()

api.add_resource(DocumentResource, '/documents/<int:doc_id>')

Flask Extension Stack

Frequently Asked Questions

What is Flask development?

Flask is a lightweight Python web framework known for its simplicity and flexibility. Flask development involves building web applications, REST APIs, and microservices with minimal boilerplate. Flask gives you control over your architecture without imposing structure.

How much does Flask development cost?

Flask development typically costs $90-130 per hour. A simple API starts around $5,000-10,000, while more complex applications range from $20,000-60,000+. Flask is often faster to develop for simple projects but may require more work for complex applications compared to Django.

Flask vs Django vs FastAPI: which should I choose?

Choose Flask for: simple APIs, microservices, or when you want maximum flexibility. Choose Django for: full-featured web apps with admin panels and ORM. Choose FastAPI for: high-performance async APIs, automatic docs, or AI/ML backends. Flask is the middle ground.

Is Flask suitable for production applications?

Yes, with proper setup. Production Flask needs: WSGI server (Gunicorn), reverse proxy (Nginx), proper configuration management, logging, error handling, and security headers. Flask powers Instagram, Pinterest, LinkedIn, and many production systems.

Can you help migrate from Flask to FastAPI?

Yes. FastAPI offers better performance and automatic documentation. Migration involves: converting routes to FastAPI syntax, adding Pydantic models, implementing async endpoints, and updating tests. I’ve migrated several Flask apps to FastAPI for performance improvements.