🧪 Flask Overview
Lightweight Python microframework for rapid web development
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📘 What is Flask?
Flask is a lightweight Python web framework released in 2010. It is considered a microframework because it provides the essentials for web development without enforcing a specific project structure. Flask is highly flexible, making it ideal for small to medium applications, APIs, and rapid prototyping.
💻 Coding Example
from flask import Flask
app = Flask(__name__)
@app.route("/")
def greet():
return "Hello, World!"
if __name__ == "__main__":
app.run(debug=True)This simple app demonstrates Flask’s minimal setup for routing and response handling.
🖼️ Visual Architecture Diagram
Flask Application Layers
- 🔹 Client (Browser, Mobile App)
- 🔹 Routing (Decorators like @app.route)
- 🔹 Views (Functions returning responses)
- 🔹 Templates (Jinja2 for HTML rendering)
- 🔹 Extensions (Flask-SQLAlchemy, Flask-Login, etc.)
- 🔹 Database (SQLite, PostgreSQL, MySQL)
⚖️ Pros and Cons
✅ Pros
- Lightweight and easy to learn
- Highly flexible and customizable
- Minimal boilerplate code
- Large ecosystem of extensions
- Excellent for APIs and microservices
❌ Cons
- Not as feature-rich as Django
- Requires manual setup for larger projects
- Scaling complex apps can be challenging
- Less opinionated, which can lead to inconsistent structures
- Security features must be added via extensions
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