Simplified django.utils.feedgenerator.get_tag_uri now that we don't require Python 2.4

    See http://diveintomark.org/archives/2004/05/28/howto-atom-id

    """

    url_split = urlparse.urlparse(url)

    # Python 2.4 didn't have named attributes on split results or the hostname.

    hostname = getattr(url_split, 'hostname', url_split[1].split(':')[0])

    path = url_split[2]

    fragment = url_split[5]

    bits = urlparse.urlparse(url)

    d = ''

    if date is not None:

        d = ',%s' % datetime_safe.new_datetime(date).strftime('%Y-%m-%d')

    return u'tag:%s%s:%s/%s' % (hostname, d, path, fragment)

    return u'tag:%s%s:%s/%s' % (bits.hostname, d, bits.path, bits.fragment)

class SyndicationFeed(object):

    "Base class for all syndication feeds. Subclasses should provide write()"