Update with Last modified time Django auto_now fields

update.py

def update_with_last_modified_time(qs, **kwargs):
    # This function adds any auto_now field to the update call because QuerySet.update() doesn't do it :X
    model_fields = qs.model._meta.get_fields()
    fields_and_value_map = {}
    for field in model_fields:
        try:
            auto_now = field.__getattribute__('auto_now')
        except AttributeError:
            auto_now = False

        if auto_now:
            if type(field) == DateField:
                fields_and_value_map[field.name] = datetime.date.today()
            elif type(field) == DateTimeField:
                fields_and_value_map[field.name] = timezone.now()

    fields_and_value_map.update(kwargs)
    return qs.update(**fields_and_value_map)