[Python] Django - How to make a variable available to all templates?

I would like to know how to pass a variable to all my templates, without repeating the same code on every method in my views.py file?

In the example below I would like to make categories (an array of category objects) available to all templates in the web app.

Eg: I would like to avoid writing 'categories':categories on every method. Is it possible?


One view method

def front_page(request):
categories = Category.objects.all()
if is_logged_in(request) is False:
return render_to_response('users/signup.html', {'is_logged_in': is_logged_in(request), 'categories':categories}, context_instance=RequestContext(request))
else:
return render_to_response('users/front_page.html', {'is_logged_in': is_logged_in(request), 'categories':categories},context_instance=RequestContext(request))


Another view method

def another_view_method(request):
categories = Category.objects.all()
return render_to_response('eg/front_page.html', {'is_logged_in': is_logged_in(request), 'categories':categories},context_instance=RequestContext(request))

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