gistfile1.txt

def update_stuff(request, pk):
    instance = get_object_or_404(PCB, pk=pk)
    if request.method in ('POST', 'PUT'):
        form = FormClass(data=request.POST, files=reuqest.FILES, instance=instance)
        if form.is_valid():
            form.save()
            ...
    else:
        form = FormClass(instance=instance)
    render_to_response({'form':form}, ...)