Decorator pattern in Python

from contextlib import contextmanager

@contextmanager
def tag(name):
    print "<%s>" % name,
    yield
    print "</%s>" % name,

with tag("h1"):
    print "moo",

print

with tag("div"):
    print "foo",

<h1>moo</h1>
<div>foo</div>

# -*-coding:utf-8 -*-
class SimpleText(object):
    def __init__(self, text):
        self.text = text

    def content(self):
        return self.text

    def __str__(self):
        return self.content()

class TagDecorator(SimpleText):
    def __init__(self, text, tag):
        super(TagDecorator, self).__init__(text)
        self.tag = tag

    def content(self):
        return '<{0}>{1}</{0}>'.format(self.tag, super(TagDecorator, self).content())

a = SimpleText('moo')
print('SimpleText: %s' % a)

b = TagDecorator('moo', 'h1')
print('TagDecorator (h1): %s' % b)