def smartformset_factory(form, formset=BaseFormSet, extra=1, can_order=False,
                         can_delete=False, min_num=None, max_num=None, validate_min=False, validate_max=False):
    """Return a FormSet for the given form class."""
    if max_num is None:
        max_num = DEFAULT_MAX_NUM
    # hard limit on forms instantiated, to prevent memory-exhaustion attacks
    # limit is simply max_num + DEFAULT_MAX_NUM (which is 2*DEFAULT_MAX_NUM
    # if max_num is None in the first place)
    absolute_max = max_num + DEFAULT_MAX_NUM
    if min_num is None:
        min_num = 0

    attrs = {'form': form, 'extra': extra,
             'can_order': can_order, 'can_delete': can_delete, 'min_num': min_num,
             'max_num': max_num, 'absolute_max': absolute_max, 'validate_min': validate_min,
             'validate_max': validate_max}
    return type(form.__name__ + str('FormSet'), (formset,), attrs)
Return a FormSet for the given form class.