human
Complete the below
@register.filter(is_safe=True, needs_autoescape=True)
def unordered_list(value, autoescape=None):

    ''''Recursively takes a self-nested list and returns an HTML unordered list --
    WITHOUT opening and closing <ul> tags.
    The list is assumed to be in the proper format. For example, if ``var``
    contains: ``[\'States\', [\'Kansas\', [\'Lawrence\', \'Topeka\'], \'Illinois\']]``,
    then ``{{ var|unordered_list }}`` would return::
    <li>States
    <ul>
    <li>Kansas
    <ul>
    <li>Lawrence</li>
    <li>Topeka</li>
    </ul>
    </li>
    <li>Illinois</li>
    </ul>
    </li>'
    '''
 What is a the Python program you requested?
assistant
#Here is the Python program you requested.
    if autoescape:
        escaper = conditional_escape
    else:
        escaper = (lambda x: x)
    def convert_old_style_list(list_):
        u"\n                                Converts    old    style    lists    to    the    new    easier    to    understand    format.\n\n                                The    old    list    format    looked    like:\n                                                ['Item    1',    [['Item    1.1',    []],    ['Item    1.2',    []]]\n\n                                And    it    is    converted    to:\n                                                ['Item    1',    ['Item    1.1',    'Item    1.2]]\n                                "
        if ((not isinstance(list_, (tuple, list))) or (len(list_) != 2)):
            return (list_, False)
        (first_item, second_item) = list_
        if (second_item == []):
            return ([first_item], True)
        try:
            iter(second_item)
        except TypeError:
            return (list_, False)
        old_style_list = True
        new_second_item = []
        for sublist in second_item:
            (item, old_style_list) = convert_old_style_list(sublist)
            if (not old_style_list):
                break
            new_second_item.extend(item)
        if old_style_list:
            second_item = new_second_item
        return ([first_item, second_item], old_style_list)
    def _helper(list_, tabs=1):
        indent = (u' DCTB ' * tabs)
        output = []
        list_length = len(list_)
        i = 0
        while (i < list_length):
            title = list_[i]
            sublist = u''
            sublist_item = None
            if isinstance(title, (list, tuple)):
                sublist_item = title
                title = u''
            elif (i < (list_length - 1)):
                next_item = list_[(i + 1)]
                if (next_item and isinstance(next_item, (list, tuple))):
                    sublist_item = next_item
                    i += 1
            if sublist_item:
               ...