from django.forms.formsets import formset_factory

def dynamic_formset(formset, extra=None, can_order=None, can_delete=None, max_num=None):
    if extra is None:
        extra = formset.extra
    if can_order is None:
        can_order = formset.can_order
    if can_delete is None:
        can_delete = formset.can_delete
    if max_num is None:
        max_num = formset.max_num
    return formset_factory(form = formset.form, 
                         formset = formset.__class__, 
                         extra = extra, 
                         can_order = can_order, 
                         can_delete = can_delete, 
                         max_num = max_num)