import wrap

def pre(self, *args, **kwds):
  print "hello: %s, %s" % (args, kwds)

def post(self, *args, **kwds):
  print "world: %s, %s" % (args, kwds)

class X(object):
  def Foo(self, *args, **kwds):
    try:
      print kwds['somearg']
    except: 
      print "No 'somearg' argument given"

  Foo = wrap.wrapmethod(Foo, pre, post)

x = X()

x.Foo(42, bar=33)
x.Foo(somearg="Hello there")