gistfile1.py

import web

class Page(web.Page):
    def create(self):
        class ClickCounter(object):
            def __init__(self):
                self.clicks = 0

        counter = ClickCounter()

        class Link(web.Link):
            def on_click(self):
                counter.clicks += 1

        link = Link("link1")

        class Model(web.Model):
            def object(self):
                return counter.clicks

        self.add(link.add(web.Label("label1", Model())))

    html = """<a href="#" web:id="link1">clicked <span web:id="label1">...</span> times</a>"""

web.start(Page)