Is there a way to pass a variable to an 'extended' template in Django?
I suspect that block
is what you are looking for in the first place.
Form your block inside the base template like this:
{% block sidebar_wrapper %}
{% if sidebar %}
<div class="width{{sidebar_width}}">
{% block sidebar %}{% endblock %}
</div>
{% endif %}
{% endblock sidebar_wrapper%}
And on your child template:
{% extends 'layout.html' %}
{% block sidebar_wrapper %}
{% with sidebar=True sidebar_width=4 %}
{{ block.super }}
{% endwith%}
{% endblock sidebar_wrapper%}
What you need is an include template tag. You can include a template in another template and render that with specific context.
{% include 'layout.html' with sidebar=True sidebar_width=4 %}
Check docs here: https://docs.djangoproject.com/en/2.2/ref/templates/builtins/#include