python - How to get something to appear on every page in Django?

Question

I'm curious as to the best-practise way to handle having something appear on every page, or on a number of pages without having to assign the data manually to every page like so:

# views.py

def page0(request):
    return render_to_response(
        "core/index.html",
        {
            "locality": getCityForm(request.user),
        },
        context_instance=RequestContext(request)
    )

def page1(request):
    return render_to_response(
        "core/index.html",
        {
            "locality": getCityForm(request.user),
        },
        context_instance=RequestContext(request)
    )
...
def page9(request):
    return render_to_response(
        "core/index.html",
        {
            "locality": getCityForm(request.user),
        },
        context_instance=RequestContext(request)
    )

Now I can think of a few ways to do this, including writing my own Context or maybe some middleware, and of course, copy/pasting this locality assignment on every page... I'm just not sure of the best way to do this. I'm pretty sure that it's not that last one though.

Answer 1

You want a context processor. The data they generate is included in every context created as a RequestContext. They are perfect for this.

Combined with base templates that show common things, you can get rid of lots of need for copying and pasting code.