[Django]-Extending a template thats already extended in Django

The typical way to solve this is by using the include template tag, not by extending with a new template.

Here is the Django doc describing this.

You can even use a variable to define a dynamic template name that will be included based on logic in your view.

Little more clarification here:

You can also have the URL route direct to the same view and have the "tab" optionally passed in as a second parameter as so:

url(r'^my-template/(?P<id>[0-9]+)/(?P<tab_name>\w+)/$', views.my_template_view, name='my-template')
url(r'^my-template/(?P<id>[0-9]+)/$', views.my_template_view, name='my-template')

And your view would look something like:

def my_template_view(request, id, tab_name=None):
    if not tab_name:
        tab_name = "tab1"
    if tab_name == "tab1":
        partial = "tab1.django.html"
    elif tab_name == "tab2":
        partial = "tab2.django.html"
    return render("my-template.html", { 'partial': partial })

And on your template you would have:

{% include partial %}

Because the included template will have the same context, you will have access to any variables that were available in the original context as well.

EDIT 2020/09/04: As noted in a comment below, the above page no longer exists. I’ve updated the above link to the latest in the 1.11 branch, but for the latest version of Django (3.1 as of this edit) you can refer to the same doc here.