How to Access Specific Values from URLs in Flask?

Using Variable URLs to Retrieve Values from Flask Routes

When working with Flask, it can be necessary to access specific values from URLs to process data. To achieve this, variable URLs provide a convenient method.

Variable URLs

To define a variable URL, simply insert placeholders in the URL path. These placeholders represent variables that can be passed as arguments to the corresponding view function.

For example:

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

This URL pattern matches all URLs starting with "/landingpage" followed by a unique identifier (e.g., "/landingpageA"). The id value can then be accessed within the landing_page view function.

Query String Parameters

An alternative approach is to pass values as query string parameters. This involves appending the parameter to the URL as a key-value pair.

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

Here, the id value can be retrieved from the request's query parameters dictionary.

Recommendation

For required parameters, using variable URLs is generally preferred as it provides a cleaner and more concise approach. However, for optional parameters, query string parameters may be more appropriate.

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