Python's decorator is some syntax sugar for wrapping functions by another functions:

def bold(func):
    def wrapper(str):
        return '<b>' + func(str) + '</b>'
    return wrapper

def div_id(id):

    def decorator(func):

        def wrapper(str):

            return (('<div id="%s">' % id) + func(str) + '</div>')

        return wrapper

    return decorator

@div_id("testid")

@bold

def p(str):

    return '<p>' + str + '</p>'

print p("test")