Justin's response is right... I recommend you vote for that one, as he was first. His approach is particularly useful if you have multiple views that need this A/B adjustment.
Note, however, that you don't need a decorator, or alterations to urls.py, if you have just a handful of views. If you left your urls.py file as is...
(r'^foo/', my.view.here),
... you can use request.GET to determine the view variant requested:
def here(request):
variant = request.GET.get('ui', some_default)
If you want to avoid hardcoding template names for the individual A/B/C/etc views, just make them a convention in your template naming scheme (as Justin's approach also recommends):
def here(request):
variant = request.GET.get('ui', some_default)
template_name = 'heretemplates/page%s.html' % variant
try:
return render_to_response(template_name)
except TemplateDoesNotExist:
return render_to_response('oops.html')
