human
What is a the Python program you requested given the following:
Complete the below
def delinkify(text, allow_domains=None, allow_relative=False):

    ''''Remove links from text, except those allowed to stay.'
    '''
assistant
#Here is the Python program you requested.
    text = force_unicode(text)
    if (not text):
        return u''
    parser = html5lib.HTMLParser(tokenizer=HTMLSanitizer)
    forest = parser.parseFragment(text)
    if (allow_domains is None):
        allow_domains = []
    elif isinstance(allow_domains, basestring):
        allow_domains = [allow_domains]
    def delinkify_nodes(tree):
        'Remove    <a>    tags    and    replace    them    with    their    contents.'
        for node in tree.childNodes:
            if (node.name == 'a'):
                if ('href' not in node.attributes):
                    continue
                parts = urlparse.urlparse(node.attributes['href'])
                host = parts.hostname
                if any((_domain_match(host, d) for d in allow_domains)):
                    continue
                if ((host is None) and allow_relative):
                    continue
                for n in node.childNodes:
                    tree.insertBefore(n, node)
                tree.removeChild(node)
            elif (node.type != NODE_TEXT):
                delinkify_nodes(node)
    delinkify_nodes(forest)
    return _render(forest)