generator_ctx.py

def view(request, template_name):
    def obj_iterator():
        for obj in Objs.objects.iterator():
            obj.do_something()
            yield obj
    
    ctx = {
        'objs': obj_iterator
    }
    
    return render_to_response(template_name, ctx)

# Later in the Template!

{% for obj in objs %}
    {{ obj }}
{% endif %}