HTMLParser that closes open tags

tag_closer.py

class TagCloser(HTMLParser):
    """
    HTMLParser that closes open tags. Call close_tags with a HTML 
    string arg which returns it with any required closing tags
    appended.
    """

    def __init__(self):
        HTMLParser.__init__(self)
        self.tags = []

    def handle_starttag(self, tag, attrs):
        self.tags.insert(0, tag)

    def handle_endtag(self, tag):
        try:
            self.tags.remove(tag)
        except ValueError:
            pass

    def close_tags(self, html)
        self.feed(html)
        return html + "".join(["</%s>" % tag for tag in self.tags])