python's OOP question

[neoedmund]

There's a program, it's result is "unexpected aaa", i want it to be
"expected aaa". how to make it work?

[code]

class C1(object):
	def v(self, o):
		return "expected "+o

class C2(object):
	def v(self, o):
		return "unexpected "+o
	def m(self):
		print self.v("aaa")

class C3(object):
	def nothing(self):
		pass

def test1():
	o = C3()
	setattr(o,"m",C2().m)
	setattr(o,"v",C1().v)
	o.m()

test1()	

[/code]