How to Retrieve Variables from URLs in Flask Routes?

Retrieving Variables from URLs in Flask Routes

To obtain a unique ID from a URL that follows the pattern "landingpage-", Flask provides a straightforward method. The following responses provide detailed guidance:

Method 1: Variable URLs

Define a variable URL by inserting placeholders within the URL path and accepting the corresponding arguments in the view function.

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

Method 2: Path Variables with Slash

Use a slash separator to specify the variable portion of the URL:

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

URL Generation with url_for

Generate URLs using the url_for function:

url_for('landing_page',>

Query String Approach (Alternative)

Alternatively, you can pass the ID as part of the query string and retrieve it from the request object:

from flask import request

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

Note that this approach is suitable when the ID is not mandatory. For required IDs, it's better to use variable URLs.

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