#!/usr/bin/python2.6

class foo(object):
    def x(self):
        print 'foo'

class foo2(foo):
    def x(self):
        print 'foo2'
        super(self.__class__, self).x() # wrong

class foo3(foo2):
    def x(self):
        print 'foo3'
        super(foo3, self).x()

f = foo3()
f.x()