Um pouco de magia. Nada de mais.
>>> class Wakadoo(object): pass
>>> wakadoo = Wakadoo()
>>> # Lets create a function to be add to the 'wakadoo' object.
>>> def __setattr__(self, name, value):
self.__dict__[name] = value
print "Congrats. This method worked."
>>> # Look, the magic...
>>> setattr(wakadoo.__class__, __setattr__.func_name, __setattr__)
>>> wakadoo.var = "Ah-ha!"
Congrats. This method worked.
>>> print wakadoo.var