function as attr of subclass != method (???)

[homunq at my-deja.com]

I'm confused by the following. Is it a bug, or is something subtle going
on that I should understand?

>>> class parent:
	pass


>>> class child(parent):
	pass


>>> achild = child()
>>> parent.method = lambda self:"yup"
>>> achild.method()
'yup'
>>> achild.method = lambda self:"nope"
>>> achild.method()
Traceback (innermost last):
  File "<pyshell#102>", line 1, in ?
    achild.method()
TypeError: not enough arguments; expected 1, got 0


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