How to Extract Variables from a URL in a Flask Route?

Get a Variable from the URL in a Flask Route

While working with web applications, it's essential to extract specific information from the URL to manipulate data or perform specific actions within the application. Flask, a web framework for Python, provides several approaches to obtain variables from URLs in a route.

Using Variable URLs

The most straightforward approach involves using variable URLs. Flask allows you to create dynamic URLs by including placeholders, which are later mapped to corresponding arguments in the view function:

@app.route('/landingpage<id>')
def landing_page(id):
    ...

This route will match any URL that starts with '/landingpage' and has a unique identifier after it, such as '/landingpageA', '/landingpageB', and so on. You can then access the variable value as id within the landing_page function.

Using URL Segments

Another common practice is to use URL segments separated by '/'. This allows for more complex patterns and hierarchical structures:

@app.route('/landingpage/<id>')
def landing_page(id):
    ...

In this example, the /landingpage/ route will match URLs like '/landingpage/A', '/landingpage/B', and so on.

Using url_for

Flask provides the url_for helper function to generate URLs for specific routes:

url_for('landing_page',>

Using Query Strings

While less preferable for required parameters, you can also capture values from the query string:

from flask import request

@app.route('/landingpage')
def landing_page():
    id = request.args['id']
    ...

In this case, the ID will be available as the id variable.

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