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


class C(etree.TreeBuilder):
  def __init__(self):
      super(C, self).__init__()
  def start(self, tag, attrs):
    print super(C, self).start(tag, attrs)
  def data(self, data):
    print super(C, self).data(data)
  def end(self, tag):
    print super(C, self).end(tag)
  def close(self):
    return super(C, self).close()

p = etree.XMLParser(target=C())
p.feed('<a>a<b>b</b></a>')
print p.close().text