I have a Jinja2 base template, base.html, which looks like

...
{% block styles %}
<link rel="stylesheet" href="{{ PATH_TO_STYLES }}/style.css">
{% endblock %}
...

and I’d like my including templates to be able to specify that PATH_TO_STYLES variable. As I understand it, block scoped ought to do this, but it doesn’t seem to work. In article.html, I have:

{% extends "base.html" %}
{% set PATH_TO_STYLES = "../.." %}
{% block styles scoped %}{{ super() }}{% endblock %}

but this does not work; the value of PATH_TO_STYLES specified in article.html is not substituted when the article.html template is rendered. How am I meant to do this?