Hackforge Academy

Explanation

Flask is a lightweight Python web framework used to build web applications and REST APIs.

Code:

from flask import Flask

app = Flask(__name__)

Explanation

A web framework provides features such as routing, request handling, responses, templates, and application configuration.

Code:

Client
  |
  v
Web Framework
  |
  +-- Routing
  +-- Request Handling
  +-- Business Logic
  +-- Response
  |
  v
Client

Explanation

Flask follows a minimal approach, allowing developers to add only the extensions and components required by the application.

Code:

Flask
 |
 +-- Flask-SQLAlchemy
 +-- Flask-JWT-Extended
 +-- Flask-Migrate
 +-- Marshmallow

Explanation

Flask applications can be used for both server-rendered web applications and REST APIs.

Code:

Browser → Flask → Jinja2 → HTML

Mobile / React → Flask → JSON REST API

Explanation

The Flask development server can be started directly from Python or using the Flask command-line interface.

Code:

flask --app app run --debug

# Default URL
http://127.0.0.1:5000