Routing Basics

Routing is how you map different URLs to different Python functions. Flask uses decorators to define routes. This allows you to build multi‑page applications.

Simple Routes

@app.route('/')
def home():
    return 'Home Page'

@app.route('/about')
def about():
    return 'About Page'

Dynamic Routes (Variable Rules)

You can capture parts of the URL as variables.

@app.route('/user/')
def user(name):
    return f'Hello, {name}!'

@app.route('/post/')
def show_post(post_id):
    return f'Post ID: {post_id}'

Types: `int`, `float`, `path` (accepts slashes).

URL Building with `url_for`

Instead of hard‑coding URLs, use `url_for()` to generate them dynamically.

from flask import url_for

with app.test_request_context():
    print(url_for('user', name='alice'))   # /user/alice

Multiple Routes for One Function

You can add multiple decorators to the same function.

@app.route('/')
@app.route('/index')
def index():
    return 'Welcome!'

Two Minute Drill

Use `@app.route('/path')` to map URLs to functions.
Dynamic routes: `` or ``.
`url_for()` generates URLs by function name.
One function can have multiple routes.

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