text: 
  from pyacc.tests.patch.mdb import cls_b
  
  
  class A(object):
  
      def __init__(self):
          self.val = 99
  
      def f1(self):
          print "A.f1 invoked: self=%s" % self
          self.val -= 1
          self.f2()
  
      def f2(self):
          print "A.f2 invoked: self=%s" % self
          b = cls_b.B(self.val)
          b.f1()
          ret = b.f2()
          print "b.f2() returns %s" % ret
  