def get_opinion(request):

    if request.method == 'POST':
        f = OpinionForm(request.POST)
        if form_is_blank(f):
            return HttpResponseRedirect(reverse('thank_you_anyway'))
        elif f.is_valid():
            #Process here
            return HttpResponseRedirect(reverse('thanks_for_participating'))
    else:
        initial = {'weekday': date.today().strftime('%A')}
        f = OpinionForm(initial=initial)

    return render_to_response(
        'get_opinion.html',
        {'form': f,},
        RequestContext(request)
    )

>>> f = MyForm({})
>>> f.has_changed()
False
>>> f = MyForm({})
>>> f.has_changed()
False
>>> f = MyForm({'name': 'test'})
>>> f.has_changed()
True
>>> f = MyForm({'name': 'test'}, initial={'name': 'test'})
>>> f.has_changed()
False