How Do I Properly Use Template Variables within Jinja2 Expressions in Flask Routes?

Utilizing Template Variables within Jinja2 Expressions

In a Flask application's routing mechanism, variables within templates can play a crucial role. Consider this scenario where a route is defined as "/magic/". To utilize the variable "" within a Jinja2 template expression, certain syntax rules must be followed.

The expression within the {{ ... }} brackets is akin to a Python expression. Hence, to reference template variables, you don't need to enclose them within additional brackets.

For the route "/magic/" and a template variable "{{ name }}", the correct expression would be:

<a href="{{ url_for('moremagic', filename=name) }}">Click to see magic happen</a>

Note the absence of additional brackets around "{{ name }}".

The target of url_for() is the name of the endpoint, not the full URL path. In this example, the endpoint name "moremagic" is the default, which corresponds to the name of the route-handling function.

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