make an html tag in python

html_tag.py

#tag('ul',''.join([tag('li',i) for i in xrange(1,6)]),{'class':'required'})
#>>>'<ul class="required"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li></ul>'

def tag(tag_name='div', content='', attrs_dict={}):
    """
    Makes an html tag.
    """
    template = '<%s>' % ('%s>%s</%s' % ('%s' % (tag_name + '%s'),'%s','%s' % tag_name)) 
    return template % (' '.join([' %s="%s"' %(k,v) for k,v in attrs_dict.iteritems()]), content)

Doesn't work with self-closing html tags like "img" btw