#!/usr/local/bin/python2
import xml.etree.ElementTree as etree


class C(etree.TreeBuilder):
  def start(self, tag, attrs):
    print super(C, self).start(tag, attrs)

  def data(self, data):
    print super(C, self).data(data)

  def end(tag):
    print super(C, self).end(tag)

  def close():
    print super(C, self).close()

p = etree.XMLParser()
p.feed('<a><b>b</b></a>')
p.close()